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SHIOZAWA Daiki
Graduate School of Engineering / Department of Mechanical Engineering
Associate Professor

Researcher basic information

■ Research Keyword
  • Fatigue
  • Nondestructive Inspection
■ Research Areas
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine materials and mechanics

Research activity information

■ Award
  • May 2014 日本材料学会, 平成25年度日本材料学会学術奨励賞, 放射光μCTイメージングおよび散逸エネルギを用いた疲労損傷の非破壊評価に関する研究
    SHIOZAWA DAIKI
    Japan society

  • Apr. 2013 日本機械学会, 2012年度 日本機械学会奨励賞（研究）, 高輝度放射光μCTイメージングを用いた疲労損傷評価の研究
    SHIOZAWA DAIKI
    Others

■ Paper
  • T. Yamamoto, Y. Ogawa, M. Hayashi, K. Kadoi, D. Shiozawa, T. Sakagami
    Abstract Background Laser welding has a faster processing speed than other welding techniques. However, defects can occur under various welding conditions, and high safety and reliability are required for applying laser welding to actual mechanical structures. Objective This study focused on estimating the fatigue limit by dissipated energy which is the energy loss resulting in fatigue damage owing to localized plastic deformation. This study was conducted to determine whether the fatigue limit of aluminum alloy laser welds can be rapidly estimated using the dissipated energy. Methods In a test with a stepwise increase in stress amplitude, the dissipated energy and the strain were measured by infrared thermography and digital image correlation from displacement measurements with a visible camera, respectively. In the fatigue limit estimation using dissipated energy, the fatigue limit is determined by the empirical rule that the stress amplitude with increasing the dissipated energy is the estimated fatigue limit. Results Laser welds exhibited the highest dissipated energy at the fracture origin of the joint. Therefore, the crack initiation point of welded joints can be visualized by measuring the dissipated energy. If the boundary value of both groups in the domain decomposition method using the least-squares approximation is the estimated fatigue limit, the estimated fatigue limits for the aluminum alloy laser welds and those base material specimens are almost consistent with the actual fatigue limits. Conclusions The fatigue limit estimation using the dissipated energy can be applied to aluminum alloy laser welds.
    Springer Science and Business Media LLC, Jan. 2025, Experimental Mechanics
    Scientific journal

  • Takumi Yamamoto, Yuki Ogawa, Miu Hayashi, Kota Kadoi, Daiki Shiozawa, Takahide Sakagami
    MDPI, Feb. 2024, The 17th International Workshop on Advanced Infrared Technology and Applications
    International conference proceedings

  • Takuma Aoki, Shogo Ohka, Daiki Shiozawa, Yuki Ogawa, Takahide Sakagami, Shiro Kubo
    MDPI, Dec. 2023, The 17th International Workshop on Advanced Infrared Technology and Applications
    International conference proceedings

  • Shoma Oiso, Daiki Shiozawa, Yuki Ogawa, Takahide Sakagami
    MDPI, Dec. 2023, The 17th International Workshop on Advanced Infrared Technology and Applications
    International conference proceedings
    Link to Kobe Univ. Repository (Kernel)

  • Hiroki Kawano, Daiki Shiozawa, Tomohiro Ooyagi, Yuki Ogawa, Takahide Sakagami
    MDPI, Oct. 2023, AITA 2023
    International conference proceedings

  • Shinsuke Haruna, Yuki Ogawa, Takumi Sakata, Daiki Shiozawa, Takahide Sakagami, Yoshiteru Yokoi, Takeshi Sugiyama
    MDPI, Oct. 2023, AITA 2023, 78th

  • Tatsuhito Morimoto, Yuki Ogawa, Takumi Sakata, Daiki Shiozawa, Takahide Sakagami
    MDPI, Oct. 2023, AITA 2023
    International conference proceedings

  • Takumi Sakata, Shunsuke Kishigami, Yuki Ogawa, Noriyasu Arima, Masahiro Nishitani, Daiki Shiozawa, Takahide Sakagami
    Elsevier BV, Sep. 2023, NDT & E International, 138, 102893 - 102893
    Scientific journal

  • Yoshikazu Nakai, Shoichi Kikuchi, Daiki Shiozawa, Takumi Hase, Issei Nakazawa, Keisuke Fujita, Mie O. Kawabata, Kei Ameyama
    Austenitic stainless steels with a bimodal harmonic structure, in which the fine grain structure (Shell) exists around the coarse grain structure (Core), are prepared by powder metallurgy to improve both strength and ductility. Herein, X-ray diffraction contrast tomography, a 3D grain mapping technique for polycrystalline materials using ultrabright synchrotron radiation X-rays, is used to reconstruct the grain shape and location and to evaluate the average excess dislocation density of the Core and Shell structures. This technique allows one to evaluate the excess dislocation density not only on the surface, but also inside the sample where damage occurs in tensile tests. The results show that the excess dislocation density of the Shell structure is higher than that of the Core structure. The excess dislocation density of homogeneous austenitic stainless steels with grain sizes similar to the Core structure of the harmonic structured stainless steel is higher than that at comparable stresses, indicating that the deformation of the bimodal harmonic structured alloy is localized in the fine grain structure. This is consistent with the results obtained from electron backscatter diffraction analysis, in which the surface grains are evaluated.
    WILEY-V C H VERLAG GMBH, Feb. 2023, ADVANCED ENGINEERING MATERIALS, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Shunsuke Kishigami, Yoshiaki Mizokami, Takumi Sakata, Yuki Ogawa, Daiki Shiozawa, Takahide Sakagami
    Elsevier BV, Dec. 2022, NDT & E International, 132, 102708 - 102708
    Scientific journal

  • Yuki Ogawa, Taiju Horita, Naoki Iwatani, Kota Kadoi, Daiki Shiozawa, Takahide Sakagami
    Elsevier BV, Sep. 2022, Infrared Physics & Technology, 125, 104288 - 104288
    Link to Kobe Univ. Repository (Kernel)

  • Yoshikazu Nakai, Daiki Shiozawa, Shoichi Kikuchi, Hitoshi Saito, Takashi Nishina, Hiroshi Kobayashi, Taizo Makino, Yutaka Neishi
    The formation and propagation of cracks in rolling contact fatigue were observed by synchrotron radiation computed laminography, and the effect of stringer-type inclusion orientation was examined. For longitudinal inclusions, cracks started forming at their tips. After cracks propagated toward the rolling direction, a longitudinal crack was kinked simultaneously at both its tips, and propagated toward the direction perpendicular to the rolling direction to form lateral cracks. After kinking, horizontal cracks were formed from the deepest point of a lateral crack, leading to flaking. On the other hand, for specimens with lateral inclusions, cracks propagated to the lateral direction without the formation of longitudinal cracks. Since the propagation life of lateral cracks and that of horizontal cracks were unrelated to the inclusion orientation, the rolling contact fatigue life of specimens with longitudinal inclusions was considerably longer than that of specimens with lateral inclusions.
    WILEY, Aug. 2022, FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 45(8) (8), 2200 - 2214, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Y. Uchida, D. Shiozawa, M. Hori, K. Kobayashi, T. Sakagami
    Background: The false apparent temperature change caused by moving objects generates noise components in thermoelastic stress analysis (TSA) and rapid fatigue limit estimation based on energy dissipation. Objective: This paper proposes a motion compensation system using visible-infrared synchronous measurements to remove apparent temperature changes. A new dissipative energy evaluation method that combines visible and infrared measurements is proposed. Methods: The displacement information is obtained using digital image correlation (DIC) in visible images. Visible and infrared measurements are performed on the same surface simultaneously. The displacement information obtained from the visible image is reflected in the infrared image by applying image processing for spatial synchronization. A white speckle pattern required for DIC is applied to black paint, and this white paint does not affect the infrared measurement. Results: In the new method, the time series of strain obtained from the visible image is used to calculate the thermoelastic temperature change, which is then compared with the actual temperature change obtained via infrared thermography to evaluate the temperature change due to energy dissipation. Motion compensation systems have been applied to TSA and dissipative energy measurements. It is confirmed that the edge effect and false apparent dissipated energy can be removed using the developed system. It is discovered that the energy dissipation behavior within one cycle of the load, which cannot be evaluated via conventional frequency analysis, can be observed comprehensively. Conclusions: This synchronous measurement system is useful for enhancing the accuracy of TSA and dissipated energy measurement.
    Mar. 2022, Experimental Mechanics, 62(3) (3), 459 - 470
    Scientific journal

  • Daiki Shiozawa, Masaki Uchida, Yuki Ogawa, Takahide Sakagami, Shiro Kubo
    Currently, gas leakage source detection is conducted by the human senses and experience. The development of a remote gas leakage source detection system is required. In this research, an infrared camera was used to detect gas leakage. The gas can be detected by the absorption of infrared rays by the gas and the infrared rays emitted from the gas itself. A three-dimensional reconstruction of a leaked gas cloud was performed to identify the gas leakage source and the flow direction of the gas. The so-called four-dimensional reconstruction of the leaked gas cloud, i.e., reconstruction of three-dimensional images of a gas cloud varying with time, was successfully performed by applying the ART (Algebraic Reconstruction Techniques) method to the multiple optical paths of infrared measurement.
    MDPI AG, Dec. 2021, Engineering Proceedings, 8(1) (1), 33 - 33
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Shunsuke Kishigami, Yuki Matsumoto, Yuki Ogawa, Yoshiaki Mizokami, Daiki Shiozawa, Takahide Sakagami, Masahiro Hayashi, Noriyasu Arima
    Heavy-duty anticorrosion coatings are applied on the surface of steel bridges for protecting against corrosion. By aging deterioration, the coating is worn from the surface year by year. Appropriate re-painting construction programs should be adopted for the maintenance of the bridges according to the evaluation of wear extent. Experimental studies were conducted with the aim of quantitative estimation of the degree of abrasion of the top coat thickness. It was found that there was a correlation between the top coat thickness and the observed infrared intensity and that this calibration relationship could be used to estimate the top coat thickness.
    MDPI AG, Nov. 2021, Engineering Proceedings, 8(1) (1), 26 - 26
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yuki Ogawa, Taiju Horita, Naoki Iwatani, Kota Kadoi, Daiki Shiozawa, Takahide Sakagami
    To optimize welding conditions that ensure the safety and reliability of laser welds, this study established an evaluation method of the fatigue strength for the laser welds of steel sheets over a short period of time. This study focuses on a fatigue limit estimation based on dissipated energy which is caused by micro plastic deformation. As a result, the area at which the temperature changes, due to dissipated energy, is locally high is the fracture origin of the laser welds. The fatigue limit of the laser welds is almost the same as the stress amplitude at which a temperature change occurs due to dissipated energy.
    MDPI AG, Nov. 2021, Engineering Proceedings, 8(1) (1), 6 - 6
    Link to Kobe Univ. Repository (Kernel)

  • Daiki Shiozawa, Takahide Sakagami, Yu Nakamura, Takato Tamashiro, Shinichi Nonaka, Kenichi Hamada, Tomoaki Shinchi
    Short fiber reinforced plastics (SFRPs) have excellent moldability and productivity compared to continuous fiber composites. In this study, thermoelastic stress analysis (TSA) was applied to detect delamination defects in short carbon fiber reinforced plastics (SCFRPs). The thermoelastic temperature change Delta T-E, phase of thermal signal theta(E), and second harmonic temperature component Delta T-D were measured. In the fatigue test of SCFRP, it was confirmed that changes in Delta T-E, theta(E), and Delta T-D appeared in the damaged regions. A staircase-like stress level test for a SCFRP specimen was conducted to investigate the generation mechanism of the Delta T-D. The distortion of the temperature change appeared at the maximum tension stress of the sinusoidal load-and when the stress level decreased, the temperature change returned to the original sinusoidal waveform. Delta T-D changed according to the change in the maximum stress during the staircase-like stress level test, and a large value of Delta T-D was observed in the final ruptured region. A distortion of the temperature change and Delta T-D was considered to be caused by the change in stress sharing condition between the fiber and resin due to delamination damage. Therefore, Delta T-D can be applied to the detection of delamination defects and the evaluation of damage propagation.
    MDPI, Sep. 2021, MATERIALS, 14(17) (17), English, International magazine
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • IWATANI Naoki, HORITA Taijyu, OGAWA Yuki, KADOI Kota, SHIOZAWA Daiki, SAKAGAMI Takahide
    Laser welding has many advantages, such as the ability to achieve high-quality welds with low deformation, but it has been confirmed that welding defects occur depending on the welding conditions. The welding defects are likely to be the initiation point of damage, it is necessary to optimize the welding conditions and evaluate the fatigue characteristics to ensure the safety and reliability of welding joint. This study focused on evaluation of fatigue strength based on dissipated energy. This evaluation method can evaluate the fatigue strength in a short period of time. So, this study investigated the applicability of this evaluation method to laser welding joint by SPCC. As a result, evaluation of fatigue strength based on dissipated energy of SPCC base metal and laser welding joint was realized, and it was clarified that evaluation of fatigue property based on dissipated energy for laser welding joint was effective. The fatigue fracture origin of laser welding joint was the area of base metal, and it is found that the fatigue strength in the welded area is higher than that in the area of the base metal. As a result of evaluating the fatigue strength of the laser welding joint based on the dissipated energy, it is found that the fatigue strength of the laser welding joint is almost the same as the fatigue limit obtained from the fatigue test.
    The Japan Society of Mechanical Engineers, 2021, The Proceedings of the Materials and Mechanics Conference, 2021, OS0827, Japanese

  • MOTOBAYASHI Hirotaka, HARUKAZE Yuya, SHIMIZU Hiroki, SIOZAWA Daiki, OGAWA Yuki, SAKAGAMI Takahide
    鉄道台車枠の重点検査箇所以外の場所に対しても，より高い頻度でき裂検査が行うことができればより有用である．そこでき裂を迅速かつ正確に検出可能な検査方法として，アクティブ温度ギャップ法に着目した．材料を局所的に加熱することで熱の移動を生じさせると，き裂部で大きな温度差が生じる．この温度差を赤外線カメラで計測することでき裂部を検出できる．本手法は，構造物に発生したき裂を面計測で遠隔から迅速に検出することが可能であり，目視検査の代替検査となりうると考えられている．本研究では，鉄道台車枠に発生したき裂の検出性を評価した．初めに検査対象の塗装の影響を検討するため，熱湯滴下による加熱実験および有限要素解析を用いた非定常熱伝導解析を行った．その結果，膜厚が100㎛程度では，表面で計測される熱伝導挙動への塗装の影響が小さいことが分かった．次に鉄道台車に用いられる厚さ9mmのSM490Y材に対して，半楕円き裂を模した各種き裂パラメータを用いることで，本手法によるき裂の検出性を検討した．モデルには加熱源に平行なき裂を用いた．その結果，加熱源に平行なき裂に対して，き裂深さ3mmの半楕円き裂に対しては，き裂端部以外のき裂幅を検知することができ，き裂深さの検出限界は1mm程度であった．温度微分値を用いた2次元画像により，材料表面のき裂形状を特定することが出来た．
    The Japan Society of Mechanical Engineers, 2021, The Proceedings of Conference of Kansai Branch, 2021.96, 3107, Japanese

  • TANAKA Yusuke, Uechi Kansei, SHIOZAWA Daiki, OGAWA Yuki, SAKAGAMI Takahide
    近年，赤外線サーモグラフィを用いた散逸エネルギ計測に基づく疲労限度推定法が注目されている．本手法は，応力振幅を階段状に増加させる試験を行い，散逸エネルギが急増する応力振幅が，疲労限度とよく一致するという経験則のもとで予測を行う．本手法を用いることで試験対象の疲労限度および疲労破壊箇所を迅速に推定できるため，様々な材料への適用が検討されているが，接合継手を対象とした事例は僅少である． そこで本研究では，摩擦攪拌接合（FSW）継手の疲労強度評価に対して，散逸エネルギ計測に基づく疲労限度推定法を検討した．FSWは固相接合で，溶融溶接と比較して接合部のひずみが少なく強度低下が小さくなり，欠陥が生じにくいという特徴を有する接合法である．FSWは主にアルミニウム合金などの軽合金材料を対象としており，航空宇宙関係や自動車など様々な産業分野で実用化されている．また近年では，異種材料接合継手へのFSW適用も進められており，FSWの適用範囲拡大と溶接部の品質向上の点においては，接合継手の疲労強度を簡易かつ迅速に評価する手法が求められている． 本研究は，アルミニウム合金A5052Oを母材としたFSWの接合部に対する散逸エネルギ計測に基づいた疲労限度評価を実施した．材，FSWの表面に研磨処理を施したFSW研磨処理材および受入材に対して散逸エネルギ計測を行った．計測結果から得られた，散逸エネルギの発生タイミングを示す位相情報から，ノイズを分離し高精度化する位相ロックイン処理を行った．その結果を用いて，散逸エネルギを用いた疲労限度推定法を適用し，FSW材と受入材の推定値は疲労限度と近い値を示した．FSW研磨処理材の疲労限度推定値は危険側に得られたため，散逸エネルギの増加率を用いて疲労限度推定を行った．その結果，FSW研磨処理材の推定値は疲労限度と比較的近い値を示し，散逸エネルギの急増する応力振幅でFSW材の疲労強度が評価できる可能性が示された．
    The Japan Society of Mechanical Engineers, 2021, The Proceedings of Conference of Kansai Branch, 2021.96, 3108, Japanese

  • UECHI Kansei, TANAKA Yusuke, SHIOZAWA Daiki, SAKAGAMI Takahide, OGAWA Yuki
    In this study, new energy dissipation evaluation method using visible-infrared hybrid measurement was developed. The dissipated energy is the temperature change due to plastic deformation. In this evaluation method, the temperature change and deformation of specimen which is subjected to the cyclic or random loading are measured by infrared thermography and visible camera. The deformation of specimen is obtained by the digital image correlation (DIC) from visible image, and the change of strain was calculated from the deformation of specimen. The temperature change due to energy dissipation was obtained by comparison between the temperature change measured by infrared thermography and calculated temperature change from time series of strain measured by visible camera and DIC. It is possible to observe the behavior of energy dissipation in detail. This new energy dissipation evaluation method was applied to austenitic stainless steel. From the results, temperature change with double frequency of load signal could be observed. It was found that the amplitude of differential temperature change obtained by new method was coincide with the double frequency component obtained by frequency analysis.
    The Japan Society of Mechanical Engineers, 2021, The Proceedings of the Materials and Mechanics Conference, 2021, OS0710, Japanese

  • M. Uchida, D. Shiozawa, T. Sakagami, S. Kubo
    The current gas leakage source detection was conducted by the human senses and experience. The development of remote gas leakage source detection system is required. In this research, infrared camera was used to detect gas leakage. The gas can be detected by the absorption of infrared rays by the gas, and the infrared rays are emitted from the gas itself. Three-dimensional reconstruction of leaked gas cloud was performed to identify the gas leakage source. The 3D reconstruction of leaked gas cloud was performed by the multiple optical paths of infrared measurement and inverse tomography analysis. Algebraic reconstruction techniques (ART) method was applied to reconstruction. In the experiments, the gas concentration distribution was simulated by the arrangement of gas cells. It was found that the gas concentration distribution composed by gas cell could be estimated by infrared images obtained with few optical path and ART method.
    2021, Lecture Notes in Mechanical Engineering, 751 - 756
    International conference proceedings

  • A. Akai, D. Shiozawa, T. Yamada, T. Sakagami
    © 2019, The Author(s). Recently, a technique for rapidly determining a material’s fatigue limit by measuring energy dissipation using infrared thermography has received increasing interest. Measuring the energy dissipation of a material under fatigue loading allows the rapid determination of a stress level that empirically coincides with its fatigue limit. To clarify the physical implications of the rapid fatigue limit determination, the relationship between energy dissipation and fatigue damage initiation process was investigated. To discuss the fatigue damage initiation process at grain size scale, we performed high-spatial-resolution dissipated energy measurements on type 316L austenitic stainless steel, and observed the slip bands on the same side of the specimen. The preprocessing of dissipated energy measurement such as motion compensation and a smoothing filter was applied. It was found that the distribution of dissipated energy obtained by improved spatial resolution measurement pinpointed the location of fatigue crack initiation. Owing to the positive correlation between the magnitude of dissipated energy and number of slip bands, it was suggested that the dissipated energy was associated with the behavior of slip bands, with regions of high dissipated energy predicting the location of fatigue crack initiation.
    Feb. 2020, Experimental Mechanics, 60(2) (2), 181 - 189
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Mizuno Hiroshi, Ogami Hiroshi, Yamashita Takahiro, Shiozawa Daiki, Izumi Yui, Sakagami Takahide, Matsui Shigeyuki

    Steel-concrete composite decks are increasingly applied for highway bridges to reduce the initial cost of construction. In Robinson type, steel plate and concrete are integrated with studs, but that studs should be careful of fatigue damage due to repeated loading of traffic wheel loads. Because the studs subjected with rotating shear force by running wheel loads, fatigue crack occurs at welding toe of the stud. In this paper, the authors experimentally investigated the progress of fatigue cracking in composite deck using infrared thermography. From the results of infrared stress measurement, the tendency of fatigue crack progress was made clear.

    Japan Society of Civil Engineers, 2020, Journal of Structural Engineering, A, 66(0) (0), 895 - 903, Japanese

  • Takahide Sakagami, Daiki Shiozawa, Yuki Terauchi, Noriyasu Arima, Yoshiaki Mizokami, Masahiro Hayashi
    © Society for Experimental Mechanics, Inc. 2020. Evaluation of fatigue damage propagation is necessary to ensure safety and to estimate the remaining life of the aging steel bridges. In this study, thermoelastic stress analysis (TSA) was applied for on-site measurement of stress distributions around fatigue cracks, and the future crack propagation behavior was estimated by the fracture mechanics approach. Experimental studies were conducted for laboratory specimens which modeled a part of welded structure in steel bridges. The stress intensity factors were calculated from stress distributions measured by TSA technique. Further TSA technique was applied to evaluate the effectiveness of repair works for defective portions. Severity reduction in stress distribution around the fatigue crack after treatment was confirmed for actual steel bridge members by TSA.
    2020, Conference Proceedings of the Society for Experimental Mechanics Series, 119 - 122
    [Refereed]
    International conference proceedings

  • Yuji Uchid, Daiki Shiozawa, Mitsuhiro Hori, Kazuki Kobayashi, Takahide Sakagami
    © Society for Experimental Mechanics, Inc. 2020. On the infrared thermography image, an apparent temperature change caused by the relative displacement between moving object and infrared camera is obtained. This paper shows the motion compensation system with the optical-infrared synchronous measurement. Displacement information of the specimen is calculated from the series of optical image using the digital image correlation method. The displacement information on the optical image is reflected to the infrared image by the homography conversion. For obtaining the displacement information by digital image correlation method, random pattern on the surface of measured object is required. In this study, white random pattern was drowned by the sputtering painting method. The motion compensation system was applied to the thermoelastic stress analysis and dissipated energy measurement. It was confirmed that the apparent temperature change and edge effect can be removed by using developed motion compensation system.
    2020, Conference Proceedings of the Society for Experimental Mechanics Series, 163 - 169
    [Refereed]
    International conference proceedings

  • Observations of Twinning and Detwinning in Magnesium Alloy by Synchrotron Radiation DCT and EBSD
    Yoshikazu Nakai, Daiki Shiozawa, Shoichi Kikuchi, Yuki Nakagawa, Kaito Asayama
    Elsevier, Jan. 2020, Procedia Structural Integrity, English
    [Refereed]
    Scientific journal

  • Ikramullah Samsul Rizal, Yoshikazu Nakai, Daiki Shiozawa, H.P.S. Abdul Khalil, Syifaul Huzni, Sulaiman Thalib
    The aim of this paper is to evaluate the Mode II interfacial fracture toughness and interfacial shear strength of Typha spp. fiber/PLLA and Typha spp. fiber/epoxy composite by using a double shear stress method with 3 fibers model composite. The surface condition of the fiber and crack propagation at the interface between the fiber and the matrix are observed by scanning electron microscope (SEM). Alkali treatment on Typha spp. fiber can make the fiber surface coarser, thus increasing the value of interfacial fracture toughness and interfacial shear strength. Typha spp. fiber/epoxy has a higher interfacial fracture value than that of Typha spp. fiber/PLLA. Interfacial fracture toughness on Typha spp. fiber/PLLA and Typha spp. fiber/epoxy composite model specimens were influenced by the matrix length, fiber spacing, fiber diameter and bonding area. Furthermore, the interfacial fracture toughness and the interfacial fracture shear stress of the composite model increased with the increasing duration of the surface treatment.
    EDPI, Jun. 2019, Materials (17pages), 12(14) (14), 2225, English, International magazine
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • 牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Mar. 2019, 平成30年度Spring-8放射光施設横断産業利用課題．一般課題(産業分野)実施報告書, Japanese
    [Refereed][Invited]
    Research institution

  • UCHIDA Yuji, MATSUI Shungo, SHIOZAWA Daiki, SAKAGAMI Takahide

    In recent years, numerous damages in the RC slabs of road bridges due to increasing traffic volume, over-weight vehicles and salt damage caused by anti-freezing agent have been reported. Therefore, development of an effective non-destructive inspection method for detecting such damages in concrete slabs beneath asphalt pavement is essential. Among various methods, the infrared thermography method enables non-contact and traveling investigations to be conducted for wide area of road bridges in a short time. Using this advantage, we developed a detection system for damages in RC slabs beneath asphalt pavement utilizing infrared thermography. The developed system can prevent degradation of thermography data based on extended exposure time by overlapped capturing of ten images from high-speed moving vehicles and can automatically generate a highly comprehensive panoramic image. Visible images of the road surface can also be acquired at the same time, making it possible to more accurately determine obstacles in the RC slabs beneath asphalt pavement.

    日本非破壊検査協会, Mar. 2019, 非破壊検査, 68(3) (3), 132 - 136, Japanese
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Mar. 2019, 平成30年度Spring-8放射光施設横断産業利用課題．一般課題(産業分野)実施報告書, Japanese
    [Refereed][Invited]
    Research institution

  • Yoshikazu Nakai, Daiki Shiozawa, Shoichi Kikuchi, Takashi Nishina, Hiroshi Kobayashi, Masanori Kurahashi, Taizo Makino, Yutaka Neishi
    The flaking failure in rolling contact fatigue (RCF) has been believed to originate from nonmetallic inclusions located beneath the surface. With conventional microscopies, however, damage process in the internal region of materials could not be observed, then they were observed by computed laminography using ultra-bright synchrotron radiation X-ray, and the effects of the shape and the orientation on the RCF crack initiation and propagation behaviors were examined. In every case, cracks were first initiated from surface inclusion, and they propagated to the surface and the thickness direction. After the crack reached a critical distance, horizontal cracks were formed from the vertical cracks, where the normal of the horizontal cracks were perpendicular to the surface, and those of the vertical cracks were parallel to the surface. However, the propagation direction just after the initiation from inclusions depended on the orientation of inclusions relative to the rolling direction.
    Materials Science and Technology, 2019, MS and T 2019 - Materials Science and Technology 2019, 822 - 829, English
    International conference proceedings

  • OGINO Yuto, SHIOZAWA Daiki, SAKAGAMI Takahide

    The dissipated energy was measured for FSW and FSW with polishing during fatigue tests and the relationship between fatigue strength and dissipated energy was investigated. Compared with FSW, the dissipated energy of FSW with polishing was lowered due to surface roughness of the welding zone. The increase in dissipated energy of FSW was related to fatigue strength.

    The Japan Society of Mechanical Engineers, 2019, The Proceedings of Conference of Kansai Branch, 2019(0) (0), 209 - 209, Japanese

  • MOTOBAYASHI Hirotaka, OGINO Yuto, SHIOZAWA Daiki, UEDA Hideki, MAKINO Taizo, SAKAGAMI Takahide

    When the material is subjected to cyclic load, temperature changes due to the thermoelastic effect is observed. The stress distribution can be evaluated by thermoelastic temperature change. Temperature change due to the energy dissipation caused by plastic slip deformation is measured by infrared camera. Anticorrosion coating is applied to a lot of mechanical structures. When the temperature change is measured over the coating, thermoelastic stress analysis and dissipated energy measurement are affected by the anticorrosion coating. In this study, the effect of the anticorrosion coating on the temperature measurement over the coating was investigated by numerical simulation and experiment. It was found from numerical simulation and experiments that the ratio of the temperature amplitude on coating to that on the metal surface decreases with increasing in load frequency, and the time delay of the temperature change on the coating relative to the metal surface increases with increasing in load frequency.

    The Japan Society of Mechanical Engineers, 2019, The Proceedings of Mechanical Engineering Congress, Japan, 2019(0) (0), J40135P, Japanese

  • YAMAMOTO Hiroki, SHIOZAWA Daiki, SAKAGAMI Takahide, KUBO Shiro

    In steel structures, fatigue cracks may initiate due to long-term use or unexpected excessive loads. A thermoelastic temperature change based on thermoelastic effects is measured under dynamic loading. It is possible to evaluate stresses on the wide surface of structure, and the stress intensity factor can be calculated from the obtained stress distribution. For the evaluation of stress intensity factor, crack length is required. It is difficult to identify the location of crack tip from infrared image. The fake temperature change due to the rigid displacement of cracked body is measured. To improve the accuracy of thermoelastic stress measurement and crack tip identification, the motion compensation using an optical camera and the measurement of the energy dissipation at crack tip were applied to the evaluation of stress intensity factor. It was found that the fake temperature change can be removed by the motion compensation using DIC with an optical camera, and the size and location of highly dissipation energy area coincide with the plastic zone at crack tip.

    The Japan Society of Mechanical Engineers, 2019, The Proceedings of the Materials and Mechanics Conference, 2019(0) (0), OS1203, Japanese

  • YAMASHITAFUJI Takuto, FUKAYA Naotaka, SHIOZAWA Daiki, SAKAGAMI Takahide, ITO Kunpei, MITSUI Yujiro, IIZUKA Takashi, KAWAI Kosuke

    In recent years, the solution for challenge that car body weight reduction compatible with rigidity improvement is required. Weld bonding is one of the methods to solve the problem. This method is based on a combination of bonding at the car body and spot welding, and this makes it possible to improve rigidity of the body structure even if the thickness of steel plate is reduced. For applying weld bond method, inspection of the adhesion region is important. Therefore, developing a new nondestructive testing technique which enables in-line inspection for all car bodies is required. In this research, we examined the applicability of the active pulse heating infrared thermography for the inspection of adhesion region. We tested two kinds of specimen in this research. One is a hat type specimen which was simulated car body frame parts, the other is a plate specimen for examining the effect of thickness of steel sheet on the accuracy of adhesion region identification. Further for simulating the actual in-line production process, applicability of the active infrared thermography was tested for plate specimen heated to high temperature. Experimental results show the applicability of the proposed technique for the in-line nondestructive testing for car body frame parts under production process.

    The Japan Society of Mechanical Engineers, 2019, The Proceedings of the Materials and Mechanics Conference, 2019(0) (0), OS1207, Japanese

  • NISHIMURA Hiroki, SHIOZAWA Daiki, SAKAGAMI Takahide, KUBO Shiro, TSUDUKI Seiichi, MORIMOTO Takashi

    With the retirement of skilled workers and the aging deterioration of gas plant facilities, interest in the development of automated and remote gas detection methods is increasing. Therefore, a gas leak detection method using infrared camera has been proposed. Invisible gas can be detected from spectrum infrared absorption of the target gas and the emitted infrared ray from the gas itself. The piping of a gas plant is very complicated, so it is very useful that the gas leak source can be identified. In this study, the gas-leak source identification is performed by the inverse problem analysis using the gas-signal image created based on the infrared measurement data. The gas-signal image is obtained by applying a data processing scheme that excludes background temperature change and high frequency noise, and it extracts only the temperature change due to the influence of gas from infrared measurement data. The least residual method, one of the typical inverse problem analysis methods, is employed to estimate the location of the gas leak source from the sequential infrared images of the gas cloud distribution and flow. It was found from numerical simulation and laboratory experiments that it was possible to estimate the location of the gas leak source, even when the leak source was hidden by obstacles such as piping in infrared images.

    The Japan Society of Mechanical Engineers, 2019, The Proceedings of the Materials and Mechanics Conference, 2019(0) (0), OS1208, Japanese

  • Daiki Shiozawa, Takahide Sakagami
    2019, Yosetsu Gakkai Shi/Journal of the Japan Welding Society, 88(3) (3), 160 - 164
    [Refereed]
    Scientific journal

  • Daiki Shiozawa, Yuto Ogino, Takaya Washio, Takahide Sakagami, Hideki Ueda, Taizo Maikino
    © The Society for Experimental Mechanics, Inc. 2019. The fatigue limit estimation method based on the dissipated energy measurement was applied to the single bead-on-plate weld. The stair-case-like stress level test was conducted to the bead-on-plate specimen. The local concentration of dissipated energy was observed in the weld toe. The change in dissipated energy at this local high dissipated energy point showed sharp increase from the certain stress amplitude, and this stress amplitude coincided with the fatigue limit for the bead-on-plate specimen obtained from S-N curves.
    SEM, 2019, Conference Proceedings of the Society for Experimental Mechanics Series, 7, 119 - 123, English
    [Refereed]
    International conference proceedings

  • Takahide Sakagami, Daiki Shiozawa, Yu Nakamura, Shinichi Nonaka, Kenichi Hamada
    © The Society for Experimental Mechanics, Inc. 2019. Short carbon fiber composite materials are receiving a lot of attentions because of their excellent moldability and productivity, however they show complicated behaviors in fatigue fracture due to the random fibers orientation. In this study, thermoelastic stress analysis (TSA) using an infrared thermography was applied to the evaluation of fatigue damage in short carbon fiber composites. Second harmonic component of thermoelastic temperature change that is obtained by lock-in processing based on double-frequency against loading frequency was conducted to identify the turbulence in thermoelastic waveform due to fatigue damage evolution. It was found that the portions showing high second harmonic component values coincided with the portions where delamination damages were detected.
    SEM, 2019, Conference Proceedings of the Society for Experimental Mechanics Series, 7, 109 - 113, English
    [Refereed]
    International conference proceedings

  • AKAI ATSUSHI, SHIOZAWA DAIKI, FUNAZO SYUNSUKE, CHINZAKA KEITA, SAKAGAMI TAKAHIDE
    the society of materials science, Japan, Dec. 2018, Journal of the society of materials science, Japan, 67(12) (12), 1036 - 1041, Japanese
    [Refereed]
    Scientific journal

  • 牧野 泰三, 根石豊, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Sep. 2018, 平成29年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, 209 - 212, Japanese
    [Refereed][Invited]
    Research institution

  • 牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Sep. 2018, 平成29年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, pp.60-64, 2018, 60 - 64, Japanese
    [Refereed][Invited]
    Research institution

  • SHIOZAWA DAIKI, KIKUCHI SHOICHI, NAKAI YOSHIKAZU, 飴山 恵, 太田 美絵
    高輝度光科学研究センター, Sep. 2018, 平成29年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, pp.121-124, 2018, 121 - 124, Japanese
    [Refereed][Invited]
    Research institution

  • Fatigue crack evaluation for steel bridge maintenance by infrared thermography
    SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOKAMI Yoshiaki, Masahiro Hayashi, IZUMI Yui
    JSNDI and ASNT, Jul. 2018, Proc. Of the Sixth Japan-US NDT Symposium Emerging NDE Capabilities for a Safer World, Paper No. 501044, English
    International conference proceedings

  • Yoshikazu Nakai, Daiki Shiozawa, Shoichi Kikuch, Hitoshi Saito, Takashi Nishina, Taizo Makino, Yutaka Neishi
    EDP Sciences, Jun. 2018, MATEC Web of Conferences, 165(11002) (11002), 1 - 8, English
    [Refereed]
    International conference proceedings
    Link to Kobe Univ. Repository (Kernel)

  • Yoshikazu Nakai, Daiki Shiozawa, Naoya Asakawa, Kenji Nonaka, Shoichi Kikuchi
    MDPI, Jun. 2018, Proceedings, 2(380) (380), 1 - 7, English
    [Refereed]
    International conference proceedings
    Link to Kobe Univ. Repository (Kernel)

  • Yoshikazu Nakai, Daiki Shiozawa, Shoichi Kikuch, Hitoshi Saito, Takashi Nishina, Taizo Makino, Yutaka Neishi
    The flaking failure in rolling contact fatigue (RCF) results from crack initiation and propagation has been believed to originate from non-metallic inclusions located beneath the surface. With conventional microscopies, however, damage process in the internal region of materials could not be observed, then RCF crack initiation and propagation behaviours were observed by using synchrotron radiation computed laminography (SRCL) in the brightest synchrotron facility in Japan, and the effect of the inclusion orientation on the RCF property was examined. In our previous studies, crack initiation and propagation behaviours caused by extended MnS inclusions distributed in depth or transverse (width) direction was observed by the SRCL. In the present study, the fracture mechanism under RCF was discussed on specimens with MnS inclusions distributed in the rolling direction. As a result, vertical cracks were initiated on the surface, parallel to the ball-rolling direction in specimens. The crack propagation direction was then changed perpendicular to the rolling direction. Thereafter, similar with our previous studies, vertical cracks caused the horizontal cracks beneath the surface, when the vertical cracks reached to a critical length. The ratio of the vertical crack initiation life to the flaking life was higher than specimens with other inclusion orientation.
    EDP Sciences, May 2018, MATEC Web of Conferences, 165, English
    [Refereed]
    International conference proceedings
    Link to Kobe Univ. Repository (Kernel)

  • SAKAGAMI Takahide, MIZOKAMI Yoshiaki, SHIOZAWA Daiki, Masahiro Hayashi, Masahiro Takeguchi
    Heavy-duty anticorrosion coating with multiple-layered paints is applied to long-span steel bridge members on the sea. By aging deterioration, the coating is worn from surface year by year. Appropriate repainting programs should be adopted for the maintenance of the bridges according to the evaluation of wear extent. In this study a new nondestructive evaluation technique using short wavelength infrared (SWIR) camera, that enables us to easily detect the wear loss of surface fluororesin coating layer, is developed based on the difference in spectral absorptance between surface fluororesin coating and inner-layer epoxy resin coating.
    SPIE, May 2018, Proc. SPIE, 10661, paper#106610T, English
    [Refereed]
    International conference proceedings
    Link to Kobe Univ. Repository (Kernel)

  • 牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Apr. 2018, 平成29年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, 70 - 73, Japanese
    [Refereed][Invited]
    Research institution

  • NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Apr. 2018, 平成29年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, 108 - 110, Japanese
    [Refereed][Invited]
    Research institution

  • TERAUCHI Yuki, IHARA Koki, SHIOZAWA Daiki, SAKAGAMI Takahide, MIZOKAMI Yoshiaki, ARIMA Noriyasu, HAYASHI Masahiro

    In order to maintain the safety of infrastructures such as steel bridges, it is important to detect fatigue cracks by nondestructive evaluation, to evaluate crack propagation rate, and to verify the effectiveness of crack repair.One of the effective non-destructive evaluation methods for these purposes is thermoelastic stress measurement by infrared thermography.In this method, stress distribution is measured based on the temperature fluctuation due to the thermoelastic effect. It enables us to conduct remote nondestructive and noncontact measurement of stress distribution.In this study, a plate bending fatigue test was carried out using specimens simulating steel members with fatigue cracks in actual bridges. The relationship between crack propagation rate and stress intensity factor range were obtained from measured stress data. It is found that obtained relation agrees well with the Paris law. Based on the experimental result, the reduction of crack propagation rate by the repair works in the actual bridge is estimated.

    The Japan Society of Mechanical Engineers, 2018, The Proceedings of the Materials and Mechanics Conference, 2018(0) (0), OS0405, Japanese

  • AZE Hiroki, CHENG Tzu Yang, SATO Daisuke, SAKAGAMI Takahide, SHIOZAWA Daiki

    Nondestructive inspection methods using infrared thermography for detecting delamination of surface finishing material such as tiles or mortal on concrete structures have been employed for a long time due to their advantages of effectiveness being able to measure a wide area at once. However in the case of using infrared thermography having a sensitivity in 8-14μm spectrum band used in ordinary building inspection, there is a problem that infrared images are influenced by the reflection of surrounding infrared emitting sources such as solar radiation or high temperature heat sources. In this study, infrared ray in 5-8μm spectrum band is utilized its low reflectivity on shiny white tile surface and high spectrum absorbance of atmosphere for avoiding the reflection. Infrared thermography having a sensitivity in 5-8μm spectrum band is developed based on microbolometer infrared camera to make it possible to reduce the reflection on building surface. We measure the temperature distribution on the surface of the building using the infrared cameras having sensitivity in 5-8μm and 8-14μm spectrum bands. From experimental results, we found that 5-8μm spectrum band infrared camera has the ability of reducing the influence of solar reflection as well as the defect detectability.

    The Japan Society of Mechanical Engineers, 2018, The Proceedings of the Materials and Mechanics Conference, 2018(0) (0), OS0401, Japanese

  • MATSUMOTO Yuuki, SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOKAMI Yoshiaki, ARIMA Noriyasu, HAYASHI Masahiro

    Heavy anticorrosion paint is applied on the surface of steel bridges for protecting corrosion. The heavy anticorrosion coating is composed of multiple paint layers such as zinc rich paint undercoating for electric corrosion protection, epoxy resin middle coat paint for protecting the zinc rich paint, and weather proof fluorine resin top coat. In the maintenance program of steel bridge anticorrosion coating, it is important to decide the timing of repainting repair, and in general the timing is set when the weather proof fluorine resin top coat is lost. However it is difficult to detect the loss of top coat by visual testing. Therefore it is beneficial for the preventive maintenance to determine the wear of top coat quantitatively before the top coat is completely lost. In this study, experiments were conducted with the aim of quantitative estimation of the degree of abrasion of the top coat thickness. It was found that it is possible to estimate the topcoat thickness based on the infrared luminance value.

    The Japan Society of Mechanical Engineers, 2018, The Proceedings of the Materials and Mechanics Conference, 2018(0) (0), OS0402, Japanese

  • SHIOZAWA Daiki, MINAMISAKO Naoya, YANAGISAWA Eiichi, FUKUTA Yuichi, SAKAGAMI Takahide

    The fatigue limit estimation based on the dissipated energy measurement has been developed and the applicability of this technique for some steels has been investigated. However, there have been no reports on high-strength materials such as Ni-base high-strength alloys. Establishment of a simple and rapid fatigue limit estimation method for materials used under high load environment like this material is expected to greatly contribute to improvement of machine safety and reliability. In this study, we investigated the applicability of fatigue limit estimation method based on dissipated energy measurement for Ni-based alloy Inconel718.

    The Japan Society of Mechanical Engineers, 2018, The Proceedings of the Materials and Mechanics Conference, 2018(0) (0), PS16, Japanese

  • Daiki Shiozawa, Takahide Sakagami, Yu Nakamura, Shinichi Nonaka, Kenichi Hamada
    Carbon fiber-reinforced plastic (CFRP) is widely used for structural members of transportation vehicles such as automobile, aircraft, or spacecraft, utilizing its excellent specific strength and specific rigidity in contrast with the metal. Short carbon fiber composite materials are receiving a lot of attentions because of their excellent moldability and productivity, however they show complicated behaviors in fatigue fracture due to the random fibers orientation. In this study, thermoelastic stress analysis (TSA) using an infrared thermography was applied to evaluate fatigue damage in short carbon fiber composites. The distribution of the thermoelastic temperature change was measured during the fatigue test, as well as the phase difference between the thermoelastic temperature change and applied loading signal. Evolution of fatigue damage was detected from thedistribution of thermoelastic temperature change according to the thermoelastic damage analysis(TDA) procedure. It was also found that fatigue damage evolution was more clearly detected than before by the newly developed thermoelastic phase damage analysis (TPDA) in which damaged area was emphasized in the differential phase delay images utilizing the property that carbon fiber shows opposite phase thermoelastic temperature change.
    MDPI AG, Dec. 2017, Sensors (Switzerland), 17(12) (12), 2824 - 2824, English, International magazine
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Y. Nakai, D. Shiozawa, S. Kikuchi, T. Obama, H. Saito, T. Makino, Y. Neishi
    Since rolling contact fatigue (RCF) is known to be affected by non-metallic inclusions, the RCF crack initiation and propagation mechanisms in high-strength steels were observed using ultrabright synchrotron radiation laminography. The material of the sample was a high-carbon chromium bearing steel, which intentionally contained a high concentration of sulfur to enable the observation of crack initiation from MnS inclusions. To conduct an RCF test nearby the experimental hatch of a beam line of a synchrotron radiation facility, a special RCF testing machine was developed. Fatigue tests were interrupted to conduct laminography. The fatigue life for flaking depended on the length, width, and orientation of inclusions. For every length and orientation of inclusions, vertical cracks, whose faces were perpendicular to the rolling direction, first appeared, then horizontal cracks, whose faces were parallel to the sample surface, were formed after the vertical cracks reached a critical length. The initiation life of the vertical cracks and horizontal cracks depended on the length, width, and orientation of the MnS inclusions. The depth of horizontal crack initiation site, however, was almost independent of these parameters. The mechanism of the flaking process, which was directly observed by laminography using synchrotron radiation, was completely different from that previously supposed from observations by conventional microscopy. (C) 2017 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Oct. 2017, ENGINEERING FRACTURE MECHANICS, 183, 180 - 189, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Takahide Sakagami, Yoshiaki Mizokami, Daiki Shiozawa, Taisei Fujimoto, Yui Izumi, Taku Hanai, Akira Moriyama
    Ageing steel bridges suffer fatigue cracks thereby necessitating immediate inspection, structural integrity evaluation or repair in the life cycle of steel bridges. We propose non-destructive evaluation techniques employing infrared thermography enabling us to remotely inspect the fatigue cracks in steel bridges and evaluate the structural integrity on the basis of thermoelastic stress measurement. This study presents a structural integrity assessment of steel bridges using remote measurement of the stress field around the fatigue cracks. We focus upon experimental results confirming reduction in the severity of the stress distribution around the fatigue cracks after the repair or reinforcement of members in steel bridges. (C) 2017 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Oct. 2017, ENGINEERING FRACTURE MECHANICS, 183, 1 - 12, English
    [Refereed]
    Scientific journal

  • Taizo Makino, Yutaka Neishi, Daiki Shiozawa, Shoichi Kikuchi, Hitoshi Saito, Kentaro Kajiwara, Yoshikazu Nakai
    Elsevier, Oct. 2017, Procedia Structural Integrity, 7, 468 - 475, English
    [Refereed]
    Scientific journal

  • 牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池将一
    高輝度光科学研究センター, Sep. 2017, 2016B期産業新分野支援課題・一般課題（産業分野）実施報告書, 82 - 85, Japanese
    [Refereed][Invited]
    Research institution

  • NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    高輝度光科学研究センター, Sep. 2017, 2016B期産業新分野支援課題・一般課題（産業分野）実施報告書, 135 - 138, Japanese
    [Refereed][Invited]
    Research institution

  • SAKAGAMI Takahide, MIZOKAMI Yoshiaki, SHIOZAWA Daiki, IZUMI Yui, MORIYAMA Akira
    Fatigue crack propagation in aging steel bridges has become a serious problem. Nondestructive evaluation of fatigue damage propagation is necessary to ensure safety and to estimate the remaining life of the bridges. Conventionally employed nondestructive testing (NDT) techniques such as visual testing, magnetic particle testing and ultrasonic testing are time-and labor- consuming techniques, further these NDT techniques cannot be used to directly evaluate the remaining strength of the bridges. Thermoelastic stress analysis (TSA) using infrared thermography has been widely used as an effective full-field experimental stress measurement technique. In this study, TSA was applied for on-site measurement of stress distributions around fatigue cracks, and the future crack propagation behavior was estimated by the fracture mechanics approach. Experimental studies were conducted for laboratory specimens which modeled a part of welded structure in steel bridges. The stress intensity factors were calculated from stress distributions measured by TSA technique. Relationship between stress intensity factor ranges and crack propagation rates was obtained. It is found that the obtained relationship shows a good correspondence with the Paris law. Further TSA technique was applied to evaluate the effectiveness of repair or reinforcement for defective portions. Severity reduction in stress distribution around the fatigue crack after treatment was confirmed for actual steel bridge members by TSA. Crack propagation rate was estimated from the stress intensity factor calculated from on-site stress measurement data. As the result, 55% reduction in crack propagation rate was ascertained indicating the positive effect of the crack repair. (c) 2017 The Authors. Published by Elsevier B.V.
    Elsevier, Sep. 2017, Procedia Structural Integrity, 5, 1370 - 1376, English
    [Refereed]
    International conference proceedings

  • Effect of mean stress on phase difference of dissipated energy
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, WASHIO Takaya, SAKAGAMI Takahide
    AITA, Sep. 2017, Abstract Booklet of the 14th edition of the International Workshop on Advanced Infrared Technology and Applications, AITA 2017, 183 - 186, English
    [Refereed]
    International conference proceedings

  • Detection of fatigue damage in short carbon fiber reinforced plastics using thermoelasticity
    SAKAGAMI Takahide, SHIOZAWA Daiki, NAKAMURA Yu, NONAKA Shinichi, HAMADA Kenichi
    AITA, Sep. 2017, Abstract Booklet of the 14th edition of the International Workshop on Advanced Infrared Technology and Applications, AITA 2017, 168 - 171, English
    [Refereed]
    International conference proceedings

  • Yoshikazu Nakai, Daiki Shiozawa
    Society of Materials Science Japan, Aug. 2017, Zairyo/Journal of the Society of Materials Science, Japan, 66(8) (8), 621 - 626, Japanese
    [Refereed][Invited]

  • D. Shiozawa, T. Inagawa, T. Washio, T. Sakagami
    In this paper, a technique for improving the accuracy of a dissipated energy measurement based on the phase information-called the phase 2f lock-in infrared method-is proposed. In the conventional 2f lock-in infrared method, the dissipated energy is obtained as the double frequency component of the measured temperature change. In this work, a phase analysis of the double frequency component has been conducted. It is found that the double frequency component includes the influence of the energy dissipation and harmonic vibration of the fatigue testing machine, and the phase difference between the thermoelastic temperature change and the double frequency component is a specific value. The phase 2f lock-in method utilizes a specific phase of the dissipated energy and is effective for removing the noise component such as the thermoelastic temperature change due to the harmonic vibration of fatigue testing machine. This method provides an improvement in the accuracy of the fatigue-limit estimate and the detection of future crack initiation points based on the dissipated energy.
    IOP PUBLISHING LTD, Apr. 2017, MEASUREMENT SCIENCE AND TECHNOLOGY, 28(4) (4), English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Crack initiation and propagation behaviors under rolling contact fatigue observed by laminography using synchrotron radiation X-ray
    Y. Nakai, D. Shiozawa, S. Kikuchi, T. Obama, H. Saito, T. Makino, Y. Neishi
    The rolling contact fatigue (RCF) crack initiation and propagation behaviors in high strength steels were observed using ultra-bright synchrotron radiation laminography. The fatigue life for flaking depended on the length, width, and orientation of inclusions. In either case, vertical cracks, whose faces were perpendicular to the rolling direction, were first appeared, then horizontal cracks, those faces were parallel to the sample surface were formed after the vertical cracks reached a critical length. The initiation life of the vertical cracks and horizontal cracks depended on the length, width, and orientation of the MnS inclusions. The depth of the horizontal crack initiation, however, was almost independent of these parameters.
    International Conference on Fracture, 2017, ICF 2017 - 14th International Conference on Fracture, 1, 191 - 192, English
    International conference proceedings

  • YOSHINAKA Fumiyoshi, NAKAMURA Takashi, TAKAKU Kazuaki, SHIOZAWA Daiki, NAKAI Yoshikazu, UESUGI Kentaro

    The initiation and growth of internal small fatigue cracks with around ten or several dozen μm in Ti-6Al-4V were nondestructively examined by using synchrotron radiation μCT at the large synchrotron radiation facility SPring-8. Lots of grain-sized internal cracks were observed roughly evenly in the observation volume in the specimen; in contrast, only one surface crack was detected. The initiation lives of the internal cracks were widely different for each crack and had no significant correlation with the crack initiation site nor the initial crack size. The internal cracks propagated microstructure-sensitively with several crack deflections, and the growth rates were very small, less than 10-10 m/cycle. The crack growth rates just after facet formations showed large variability and had no apparent relationship with the crack initiation life nor the initial crack size. This variability can likely be attributed to microstructural inhomogeneities around the crack initiation facets. The estimated facet formation rate indicated that most facets formed rapidly compared with the following internal crack growth rate.

    The Japan Society of Mechanical Engineers, 2017, Transactions of the JSME (in Japanese), Japanese

  • SHIOZAWA Daiki, OGINO Yuto, WASHIO Takaya, UEDA Hideki, MAKINO Taizo, SAKAGAMI Takahide

    The fatigue limit estimation based on the dissipated energy measurement has been developed and the applicability of this technique for some steels has been investigated. The coating was applied to the component of the industrial structures. It is useful to measure the dissipated energy and apply the fatigue limit estimation for the industrial component without removing the coating. In this study, the effect of the coating on the dissipated energy measurement was investigated. The black body treatment is required for the infrared thermography measurement because of the metallic reflection. The sanding of coating is enough for the measurement of dissipated energy without the black body treatment of the coating. The dissipated energy measurement in the stair case like stress level test was applied to the specimen having various coating thickness. It was found that the temperature change due to the dissipated energy can be obtained even though the temperature change was attenuated by the coating with 200μm thickness.

    The Japan Society of Mechanical Engineers, 2017, The Proceedings of the Materials and Mechanics Conference, 2017(0) (0), OS0210, Japanese

  • OKUNO Souta, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 2017, The Proceedings of Conference of Kansai Branch, 2017(0) (0), P080, Japanese

  • Yoshikazu Nakai, Daiki Shiozawa, Ryota Nakao, Naoya Asakawa, Shoich Kikuchi
    A three dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8, which is the brightest synchrotron radiation facility in Japan. The developed technique was applied to a commercially pure iron and austenitic stainless steel. The shape and location of grains could be determined by DCT using the apparatus in a beam line of SPring-8. To evaluate the dislocation structure in fatigue, the total misorientation of individual grains was measured by DCT. The average value of the total misorientation over one sample was increased with the number of cycles. In a grain, the change of the total misorientation was largest for primary slip plane. For austenitic stainless steel (fcc), the change of the total misorientation in fatigue was larger for planes with larger Schmid factor, while it was not depended on the Schmid factor for commercially pure iron (bcc). This different behavior must come from planer slip in fcc structure and wavy slip in bcc structure.
    Trans Tech Publications Ltd, 2017, Materials Science Forum, 879, 1355 - 1360, English
    [Refereed]
    International conference proceedings

  • Y. Nakai, D. Shiozawa, N. Asakawa, K. Nonaka, S. Kikuchi
    A three-dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8, which is the brightest synchrotron radiation facility in Japan. The developed technique was applied to an austenitic stainless steel. The shape and location of grains could be determined by DCT using the apparatus in a beam line of SPring-8. To evaluate the dislocation structure in fatigue, the total misorientation of individual grains was measured by DCT. The average value of the total misorientation over one sample was increased with the number of cycles. In a grain, the change of the total misorientation was largest for the primary slip plane. The maximum change of the total misorientation in fatigue was larger for planes with larger Schmid factor, and the first fatigue crack initiation was occurred in a grain, which had the greatest change of the total misorientation. Copyright (C) 2017 The Authors. Published by Elsevier B.V.
    ELSEVIER SCIENCE BV, 2017, XXIV ITALIAN GROUP OF FRACTURE CONFERENCE, 2017, 3, 402 - 410, English
    [Refereed]
    International conference proceedings

  • Atsushi Akai, Daiki Shiozawa, Takahide Sakagami
    Fatigue limit estimation using infrared thermography has recently received attention as a method for reducing the time required for product design. In this study, the applicability of a method based on mean temperature and dissipated energy measurements was experimentally investigated on a titanium alloy fatigue plate specimens were fabricated from the titanium alloy Ti-6Al-4V ELI. The fatigue limit of these specimens obtained from conventional fatigue testing was found to be 620 MPa. The estimated fatigue limit obtained from mean temperature measurements was found to be 600 MPa, although estimating the fatigue limit using dissipated energy measurements was difficult because little significant change in dissipated energy values with the stress amplitude was observed. These tendencies are probably attributed to the crystal structure displaying different deformation properties and high vibration absorption properties. The resonance components from the fatigue testing instruments (noise components) were calculated from the frequency analysis of the time-series temperature fluctuation data measured by infrared thermography. The increase in the dissipated energy values (with the noise components subtracted) against the stress amplitude changed at a certain stress amplitude and the fatigue limit could be estimated to be 565 MPa. Therefore, the relative error between the fatigue limit value obtained from conventional fatigue testing and the estimated values was within 10%. The fatigue limit could be estimated more accurately by considering the influence of different deformation properties between tensile and compressive loading due to the crystal structure differences in the dissipated energy measurement.
    SPIE, 2017, Proceedings of SPIE - The International Society for Optical Engineering, 10214, 102140J - 1, English
    [Refereed]
    International conference proceedings

  • Takahide Sakagami, Daiki Shiozawa, Yu Nakamura, Shinichi Nonaka, Kenichi Hamada
    Carbon fiber-reinforced plastic (CFRP) is widely used for structural members of transportation vehicles such as automobile, aircraft or spacecraft, utilizing its excellent specific strength and specific rigidity in contrast with the metal. Short carbon fiber composite materials are receiving a lot of attentions because of their excellent moldability and productivity, however they show complicated behaviors in fatigue fracture due to the random fibers orientation. In this study, thermoelastic stress analysis (TSA) using an infrared thermography was applied to the evaluation of fatigue damage in short carbon fiber composites. The distributions of the thermoelastic temperature change was measured during the fatigue test, as well as the phase difference between the thermoelastic temperature change and applied loading signal. Evolution of fatigue damages was detected from distributions of thermoelastic temperature change according to the thermoelastic damage analysis (TDA) procedure. It was also found that fatigue damage evolution was clearly detected than ever by the newly developed thermoelastic phase damage analysis (TPDA) in which damaged area was emphasized in the differential phase delay images utilizing the nature that carbon fiber show opposite phase thermoelastic temperature change.
    SPIE, 2017, Proceedings of SPIE - The International Society for Optical Engineering, 10214, 102140M - 1, English
    [Refereed]
    International conference proceedings

  • Makino Taizo, Neishi Yutaka, Shiozawa Daiki, Kikuchi Shoichi, Saito Hitoshi, Kajiwara Kentaro, Nakai Yoshikazu
    2017, 3RD INTERNATIONAL SYMPOSIUM ON FATIGUE DESIGN AND MATERIAL DEFECTS (FDMD 2017), 7, 468 - 475
    [Refereed]

  • T. Makino, Y. Neishi, D. Shiozawa, S. Kikuchi, S. Okada, K. Kajiwara, Y. Nakai
    The objective of the present paper is to clarify the effect of shapes of circular hole defects, orientated perpendicular to the surface, on rolling contact fatigue (RCF) crack initiation and propagation in high strength steel. RCF test and synchrotron radiation micro computed tomography (SR micro CT) imaging were conducted. In the case of a 15-mu m-diameter defect, the number of cycles of rolling contact to flaking occurring (flaking life) decreased with increasing defect length. In a comparison of the CT image and the SEM view, the shapes of defects and the locations of the horizontal cracks were almost the same respectively. The mechanism of RCF crack propagation was discussed by finite element (FE) analysis. Defects led to higher tensile residual stress than that without defects in the region where the defect exists. The shear stress range at 0.1 mm in depth on the middle line of the defect and the range of mode II stress intensity factor at the bottom of a vertical crack increased with increasing defect length. In the case of a defect 50 gm in diameter, defect length does not affect flaking life. The reason for this is probably that the horizontal cracks form and propagate before vertical cracks grow to an effective size. (C) 2016 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Nov. 2016, INTERNATIONAL JOURNAL OF FATIGUE, 92, 507 - 516, English
    [Refereed][Invited]
    Scientific journal

  • 放射光X線ラミノグラフィによる水平方向介在物配向材における転動疲労はく離起点介在物の特定－介在物形状・分布の評価
    牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, 塩澤 大輝, 菊池 将一
    高輝度光科学研究センター, Sep. 2016, 平成27年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, 43 - 46, Japanese
    [Refereed][Invited]
    Research institution

  • 回折コントラストトモグラフィを用いた疲労における結晶ミスオリエンテーション挙動のその場観察
    NAKAI YOSHIKAZU, 塩澤 大輝, 菊池 将一
    高輝度光科学研究センター, Sep. 2016, 平成27年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, 132 - 133, Japanese
    [Refereed][Invited]
    Research institution

  • Relationship between dissipated energy and growth behavior of slip bands in austenitic stainless steel
    SHIOZAWA Daiki, AKAI Atsushi, INABA Ken, SAKAGAMI Takahide
    Sep. 2016, Proc. of Asia-Pacific Conference on Fracture and Strength 2016, 223 - 224, English
    [Refereed]
    International conference proceedings

  • Influence of extension tubes on thermoelastic temperature measurement with infrared thermography
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    Sep. 2016, Proc. of Asia-Pacific Conference on Fracture and Strength 2016, 225 - 226, English
    [Refereed]
    International conference proceedings

  • Non-destructive observation of internal fatigue crack growth in Ti-6Al-4V by using synchrotron radiation μCT imaging
    YOSHINAKA FUMIYOSHI, NAKAMURA TAKASHI, NAKAYAMA SHINYA, SHIZAWA DAIKI, NAKAI YOSHIKAZU, UESUGI KENTARO
    Jul. 2016, International Journal of Fatigue, 93, 397 - 405, English
    [Refereed]
    Scientific journal

  • In-situ observation of fatigue crack initiation and propagation under rolling contact by SR X-ray laminography - Inspection dor different orientation morphology
    牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, 塩澤 大輝, 菊池 将一
    高輝度光科学研究センター, Mar. 2016, 平成26年度 SPring-8 産業新分野支援課題・一般課題（産業分野）実施報告書（2015A）, 24 - 27, Japanese
    [Refereed][Invited]
    Research institution

  • Observation of Grain Misorientation in Fatigue Crack Initiation Process by Diffraction Contrast Tomography
    NAKAI YOSHIKAZU, 塩澤 大輝, 菊池 将一
    高輝度光科学研究センター, Mar. 2016, 平成26年度 SPring-8 産業新分野支援課題・一般課題（産業分野）実施報告書（2015A）, 124 - 125, Japanese
    [Refereed][Invited]
    Research institution

  • YOSHINAKA Fumiyoshi, NAKAMURA Takashi, Takaku Kazuaki, SHIOZAWA Daiki, NAKAI Yoshikazu, UESUGI Kentaro
    The initial process of internal fracture in Ti-6Al-4V was non-destructively observed by synchrotron radiation μCT imaging to clarify the crack initiation and initial growth behavior in very high cycle fatigue. As a result, a number of cracks were detected all over the observation volume. The internal crack firstly initiated at around 5.0 × 106 cycles, however, the initiation lives of these cracks varied widely. The just initiated crack propagated microstructure-sensitively at significantly low growth rate. Some cracks initiated so early and propagated so slowly, but others initiated so lately and propagated so rapidly. As above, the crack initiation sites and lives widely varied, and the crack growth rate just after the initiation has a large scatter. These results let us to conclude that the local microstructural conditions and the effect of environment around the crack are indispensable factors to fully understand the initial process of internal fracture in very high cycle fatigue.
    The Japan Society of Mechanical Engineers, 2016, The Proceedings of the Materials and Mechanics Conference, 2016, OS02-26, Japanese

  • Inclusion orientation effect on rolling contact fatigue crack paths observed by laminography using synchrotron radiation x-ray
    Y. Nakai, D. Shiozawa, S. Kikuchi, T. Obama, H. Saito, T. Makino, Y. Neishi
    Since rolling contact fatigue (RCF) property are known to be influenced by non-metallic inclusions, the RCF crack initiation and propagation mechanisms in high strength steels were observed using ultra-bright synchrotron radiation laminography. The material of the sample and ball were high carbon-chromium bearing steel. The material had intentionally contains a high concentration of sulfur to enable the observation of crack initiation from MnS inclusions. To conduct rolling contact fatigue test for thin plate nearby the experimental hatch of a beam-line of the synchrotron radiation facility, a special RCF test machine was developed. Fatigue tests were interrupted to conduct laminography. The fatigue life for flaking depended on the length, width, and orientation of inclusions. In either case, vertical cracks, whose faces were perpendicular to the rolling direction, were first appeared, then horizontal cracks, those faces were parallel to the sample surface were formed after the vertical cracks reached a critical length. The initiation life of the vertical cracks and horizontal cracks depended on the length, width, and orientation of the MnS inclusions. The depth of the horizontal crack initiation, however, was almost independent of these parameters. These mechanism of flaking process, which was directly observed by laminography using synchrotron radiation, was completely different from that previously supposed from the surface observations by conventional microscopies.
    Association for Iron and Steel Technology, AISTECH, 2016, Materials Science and Technology Conference and Exhibition 2016, MS and T 2016, 2, 975 - 982, English
    International conference proceedings

  • HIGASHI Tomoyuki, FUJIMOTO Taisei, SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOKAMI Yoshiaki, HANAI Taku, MORIYAMA Akira
    Recently there are concerns about maintenance of aging infrastructures built in the period of high economic growth. In order to maintain the safety of the steel structures, periodic inspection and proper repair are required. In addition, it is also important to confirm the effectiveness of the repair. Thermoelastic stress measurement using infrared thermography is one of the effective non-destructive evaluation techniques. In the present study, thermoelastic stress measurement is conducted for cracked members in the cable-stayed bridge in the Seto Ohashi Bridge, for the verification of repair effect. Several repair methods were investigated by experimental studies at the site. Effectiveness of the employed repair methods, i.e., the reduction of the applied stress, were verified by the thermoelastic stress measurement.
    The Japan Society of Mechanical Engineers, 2016, The Proceedings of the Materials and Mechanics Conference, 2016, PS-32, Japanese

  • 放射光X線ラミノグラフィによる転動疲労き裂発生および進展挙動のその場観察ー異なる配向形態観察の試行ー
    MAKINO Taizo, NEISHI Yutaka, NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi
    高輝度光科学研究センター, 2016, 平成27年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, Japanese
    [Refereed]
    Research institution

  • 回折コントラストトモグラフィを用いた疲労き裂発生過程の結晶ミスオリエンテーションの観察
    NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi
    高輝度光科学研究センター, 2016, 平成27年度 Spring-8産業新分野支援課題・一般課題(産業分野)実施報告書, Japanese
    [Refereed]
    Research institution

  • NAKAMURA TAKASHI, YOSHINAKA FUMIYOSHI, NAKAYAMA SHINYA, HIROYUKI OGAMA, SHIOZAWA DAIKI, NAKAI YOSHIKAZU, UESUGI KENTARO
    The purpose of this study is to develop a method for detecting small internal fatigue cracks in Ti-6Al-4V by using synchrotron radiation provided at SPring-8. An electro-hydraulic fatigue testing machine was carried into the facility and a combination of uniaxial fatigue tests and micro computed tomography (μCT) imagings were conducted. The small specimen without size effect was newly designed for μCT imaging. The conditions of the fatigue tests were determined to observe internal crack initiations within the available time at the facility. To obtain a clear and accurate image of internal cracks, several important parameters for μCT imaging such as the crack opening load, the distance between detector and specimen, were optimized. As a result, multiple internal fatigue cracks sized around 30 μm or below were successfully detected.
    日本機械学会, 2016, Bulletin of the JSME, Mechanical Engineering Letters, 2(16) (16), 00233 - 00233-16-00233, English
    [Refereed]
    Scientific journal

  • D. Shiozawa, Y. Nakai, R. Miura, N. Masada, S. Matsuda, R. Nakao
    A three dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DOT), was developed at SPring-8 (Super Photon ring - 8 GeV), which is the brightest synchrotron radiation facility in Japan, and the measurement conditions and data acquisition procedure are discussed. The developed technique was applied to a commercially pure aluminum, commercially pure iron, and austenitic stainless steel. The shape and location of grains could be determined by Da using the apparatus in a bending beam line of SPring-8. To evaluate the dislocation structure in tensile tests and fatigue tests, the rotation angle spread of individual grains was measured. The rotation angle spread is caused by mosaicity, which is related to the dislocation structure in a grain. The rotation angle spread was found to increase with increasing plastic strain. Fatigue damage could also be evaluated from the rotation angle spread obtained by Da measurement. (C) 2015 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Jan. 2016, INTERNATIONAL JOURNAL OF FATIGUE, 82, 247 - 255, English
    [Refereed]
    Scientific journal

  • Takahide Sakagami, Daiki Shiozawa, Yoshitaka Tamaki, Tatsuya Iwama
    Nondestructive testing (NDT) techniques using pulse heating infrared thermography and terahertz (THz) imaging were developed for detecting deterioration of oil tank floor, such as blister and delamination of corrosion protection coating, or corrosion of the bottom steel plate under coating. Experimental studies were conducted to demonstrate the practicability of developed techniques. It was found that the pulse heating infrared thermography was utilized for effective screening inspection and THz-TDS imaging technique performed well for the detailed inspection of coating deterioration and steel corrosion.
    SPIE-INT SOC OPTICAL ENGINEERING, 2016, THERMOSENSE: THERMAL INFRARED APPLICATIONS XXXVIII, 9861, 98611B, English
    [Refereed]
    International conference proceedings

  • Takahide Sakagami, Yui Izumi, Daiki Shiozawa, Taisei Fujimoto, Yoshiaki Mizokami, Taku Hanai
    Long-standing steel bridges suffer fatigue cracks, which necessitate immediate inspection, structural integrity evaluation or repair in the life cycle of steel bridges. The authors proposed NDT and NDE techniques employing infrared thermography at certain stage in the life cycle of steel bridges. This paper presents remote measurement of stress field around fatigue cracks in steel bridges for their structural integrity assessments. Further this paper shows experimental results confirming the severity reduction of stress distribution around fatigue cracks after the repair or reinforcement of steel bridges. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
    ELSEVIER SCIENCE BV, 2016, 21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21), 2, 2132 - 2139, English
    [Refereed]
    International conference proceedings

  • Daiki Shiozawa, Tsuyoshi Inagawa, Takaya Washio, Takahide Sakagami
    In this paper, a new fatigue limit estimation scheme for austenitic stainless steel based on the dissipated energy is proposed. The new scheme utilizes the phase 2f lock-in infrared method which is a technique for improving the accuracy of a dissipated energy measurement, and evaluates the fatigue limit based on the increasing rate of dissipated energy. This scheme is applied to the pre-strained austenitic stainless steel specimen. The fatigue limit of austenitic stainless steel specimen is increased by the plastic forming process. The phase 2f lock-in infrared method can remove the apparent dissipated energy which is caused by thermoelastic temperature change due to harmonic vibration of fatigue testing machine. The estimation scheme based on the increasing rate of dissipated energy against the stress level can evaluate the fatigue limit of the pre-strained specimen with greater accuracy than the conventional scheme. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
    ELSEVIER SCIENCE BV, 2016, 21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21), 2, 2091 - 2096, English
    [Refereed]
    International conference proceedings

  • Y. Nakai, D. Shiozawa, S. Kikuchi, T. Obama, H. Saito, T. Makino, Y. Neishi
    The rolling contact fatigue (RCF) tests were performed on a high-strength steel by a newly developed compact rolling contact fatigue test machine, and the formation and propagation of cracks were observed by the synchrotron radiation computed laminography (SRCL). An increase in the sulfur concentration, i.e., increase in inclusion length, resulted in an increase in the variation of flaking life, and materials with horizontal inclusion showed large variation compared to those with vertical inclusion although average flaking lives are almost identical. In the flaking process, cracks, those were perpendicular to the rolling surface and rolling direction, first formed from an inclusion that was adjacent to the rolling surface. Then, the crack propagated in the depth direction. After the vertical crack propagated to a critical depth, a horizontal crack formed, whose face was parallel to the rolling surface. Finally, the horizontal crack propagated to form flaking. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
    ELSEVIER SCIENCE BV, 2016, 21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21), 2, 3117 - 3124, English
    International conference proceedings

  • Y. Nakai, D. Shiozawa, S. Kikuchi, K. Sato, T. Obama, T. Makino, Y. Neishi
    In rolling contact fatigue (RCF), cracks usually initiate from inclusions beneath the surface and propagate to the contact surface. In the present study, synchrotron radiation computed laminography (SRCL) imaging was performed to observe flaking defects during the RCF of a high-strength steel. Specially fabricated inclusion-rich steel plate specimens were employed in the experiments. For the in situ observation of crack propagation, a compact RCF testing machine was developed, and a 4D analysis scheme was applied to the data obtained by SRCL. RCF tests were carried out near the measurement hatch of the beam line used SRCL to enable the successive observation of crack initiation and growth behaviors. Specimens before and after the occurrence of flaking were observed by SRCL, and flaking defects and cracks under the surface were successfully detected. As a result, details of the crack initiation and flaking process in RCF could be discussed. Shear-type horizontal cracks were found to initiate after the initiation and propagation of tensile-type vertical cracks along inclusions, where the face of the vertical cracks was perpendicular to the rolling direction and rolling surface. Therefore, the formation of vertical cracks is considered to affect shear-type crack formation and flaking, where the shape and length of inclusions also affect the initiation and propagation of vertical cracks.
    Gruppo Italiano Frattura, Oct. 2015, Frattura ed Integrita Strutturale, 9(34) (34), 246 - 254, English
    [Refereed]
    Scientific journal

  • Fatigue strength Evaluation Based on Dissipated Energy Measurement for Cavitation Peening Material
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, WASHIO Takaya, SAKAGAMI Takahide
    Oct. 2015, Proceedings of ICFD2015 International conference on Flow Dynamics, 644 - 645, English
    [Refereed][Invited]
    International conference proceedings

  • T. Makino, Y. Neishi, D. Shiozawa, S. Kikuchi, S. Okada, K. Kajiwara, Y. Nakai
    The objective of the present paper is to clarify the effect of defect length in depth direction on rolling contact fatigue (RCF) crack propagation in high strength steel. RCF test and synchrotron radiation micro computed tomography (SR micro CT) imaging were conducted. In the case of the defect with the 15 μm diameter, flaking life decreased with increasing defect length. In a comparison of the CT image and the SEM view, the shapes of defects and the locations of the horizontal cracks were almost the same respectively. The mechanism of RCF crack propagation was discussed by finite element (FE) analysis. Defects led to higher tensile residual stress than that without defects in the region where the defect exists. The shear stress range at 0.1 mm in depth on the middle line of the defect and the range of mode II stress intensity factor at the bottom of a vertical crack increased with increasing defect length.
    Gruppo Italiano Frattura, Oct. 2015, Frattura ed Integrita Strutturale, 9(34) (34), 334 - 340, English
    [Refereed]
    Scientific journal

  • Nondestructive detection of corrosion damage under corrosion protection coating using infrared thermography and terahertz imaging
    SAKAGAMI Takahide, SHIOZAWA Daiki, TAMAKI Yoshitaka, ITO Hiroki, MORIGUCHI Akihisa, IWAMA Tatsuya, SEKINE Kazuyoshi, SHIOMI Teruya
    Sep. 2015, Proceedings of 13th International Workshop on Advanced Infrared Technology & Applications, 229 - 233, English
    [Refereed][Invited]
    International conference proceedings

  • Accuracy improvement of dissipated energy measurement and fatigue limit estimation by using phase information
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, AKAI Atushi, INABA Ken, SAKAGAMI Takahide
    Sep. 2015, Proceedings of 13th International Workshop on Advanced Infrared Technology & Applications, 36 - 40, English
    [Refereed][Invited]
    International conference proceedings

  • Atsushi Akai, Ken Inaba, Daiki Shiozawa, Takahide Sakagami
    The evaluation of fatigue limit is important in designing products. The fatigue limit estimation based on dissipated energy has been getting considerable attentions. In this method, the temperature change due to irreversible energy dissipation is measured by infrared thermography for various levels of stress amplitude. It is known that the dissipated energy increases with increasing stress levels, and a certain stress level, where the change in dissipated energy shows the sharp increase, coincides with the fatigue limit of the material. In this study, the dissipated energy measurement was applied to the estimation of the crack initiation location. The fatigue limit estimation was carried out for the specimen that had multiple notches. The estimated fatigue limit showed similar value at each notch and that gave close agreement with the fatigue limit obtained from conventional fatigue tests. On the other hand, the magnitude and change of dissipated energy at each notch were different. In experiments of fatigue limit estimation, the notch, where the maximum value of dissipated energy was measured, was different from the notch where the maximum sum of principal stress was measured. To investigate the location of the crack initiation, the same specimen was carried out in the constant stress amplitude fatigue test. It was found that the notch where the largest dissipated energy was observed coincided with the crack initiated notch. Therefore, it was considered that the location of crack initiation could be estimated at the early period of fatigue by using the dissipated energy measurement.
    Society of Materials Science Japan, Aug. 2015, Zairyo/Journal of the Society of Materials Science, Japan, 64(8) (8), 668 - 674, Japanese
    [Refereed]
    Scientific journal

  • In-situ Observation of Fatigue Crack Initiation and Propagation under Rolling Contact by SR X-ray Laminography - Effect of Inclusion Size and Morphology
    牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, 塩澤 大輝, 菊池 将一
    高輝度光科学研究センター, Aug. 2015, 平成26年度 SPring-8 新産業分野支援課題・一般課題（産業分野）実施報告書（2014A）, 38 - 41, Japanese
    [Refereed][Invited]
    Research institution

  • AKAI ATSUSHI, INABA KEN, SHIOZAWA DAIKI, SAKAGAMI TAKAHIDE
    日本材料学会, Aug. 2015, 材料, 64(8) (8), 668 - 674, Japanese
    [Refereed]
    Scientific journal

  • Evaluation of Dislocation Density inside Grain by Diffraction Contrast Tomography
    NAKAI YOSHIKAZU, 塩澤 大輝, 菊池 将一
    高輝度光科学研究センター, Aug. 2015, 平成26年度 SPring-8 新産業分野支援課題・一般課題（産業分野）実施報告書（2014A）, 149 - 152, Japanese
    [Refereed][Invited]
    Research institution

  • 高輝度放射光の回折コントラストトモグラフィーによる疲労すべりの3D観察
    NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi
    The Society of Materials Science Japan, committee on fatigue of materials, Jul. 2015, 第321回疲労部門委員会研究討論会資料, 8 - 12, Japanese
    [Invited]
    Symposium

  • Measurement of Plastic Strain by 3D Grain Mapping Technique
    NAKAI YOSHIKAZU, SHIOZAWA DAIKI
    Japan Synchrotron Research Institute, Jul. 2015, SPring-8/SACLA Research Report, 3(2) (2), 457 - 460, Japanese
    [Refereed]
    Research institution

  • Observation of Rolling Contact Fatigue Crack Propagtion and Delamination Behavior by Using Sunchrotron Radiation Laminography
    Makino Taizo, Neishi Yutaka, Nakai Yoshikazu, Shiozawa Daiki, Kikuchi Shoichi
    高輝度光科学研究センター, Mar. 2015, 平成26年度 SPring-8 産業分野支援課題・一般課題（産業分野）実施報告書（2014A）, Japanese
    [Refereed][Invited]
    Research institution

  • Development of High Cycle Fatigue Damage Evaluation Technique for Polycrystalline Metallic Materials by Diffraction Contrast Tomography
    Nakai Yoshikazu, Shiozawa Daiki, Kikuchi Shoichi
    高輝度光科学研究センター, Mar. 2015, 平成26年度 SPring-8 産業分野支援課題・一般課題（産業分野）実施報告書（2014A）, Japanese
    [Refereed][Invited]
    Research institution

  • Observation of Rolling Contact Fatigue Crack Propagtion and Delamination Behavior by Using Sunchrotron Radiation Laminography
    Makino Taizo, Neishi Yutaka, Nakai Yoshikazu, Shiozawa Daiki, Kikuchi Shoichi
    高輝度光科学研究センター, Mar. 2015, 平成26年度 SPring-8 産業分野支援課題・一般課題（産業分野）実施報告書（2014A）, Japanese
    [Refereed][Invited]
    Research institution

  • Tsuyoshi Inagawa, Daiki Shiozawa, Atsushi Akai, Ken Inaba, Takahide Sakagami
    Fatigue limit estimation based on dissipated energy measurement was applied to the evaluation of shot peening effect on fatigue limit improvement. It was found that estimated fatigue limit based on dissipated energy for the shot peened material showed conservative value, compared with that obtained by conventional fatigue tests. In the constant stress amplitude fatigue test, dissipated energy for unbroken specimens with shot peening treatment was larger than that for broken as-received specimen. SEM observation for unbroken specimens with shot peening treatment showed that some micro cracks existed inside of dents. These facts indicated that dissipated energy caused by structure change leading to crack initiation was observed at stress amplitude above the estimated fatigue limit for unbroken specimens with shot peening treatment, however crack propagation was inhibited by compressive residual stress field around initiated micro cracks. Therefore, it was considered that fatigue limit estimated by dissipated energy measurement indicated crack initiation limit in total fatigue life.
    Society of Materials Science Japan, Dec. 2014, Zairyo/Journal of the Society of Materials Science, Japan, 63(12) (12), 850 - 856, Japanese
    [Refereed]
    Scientific journal

  • INAGAWA TSUYOSHI, SHIOZAWA DAIKI, AKAI ATSUSHI, INABA KEN, SAKAGAMI TAKAHIDE
    日本材料学会, Dec. 2014, 材料, 63(12) (12), 850 - 856, Japanese
    [Refereed]
    Scientific journal

  • A new approach for evaluating stress intensity factor based on thermoelastic stress analysis
    IZUMI Yui, SAKAGAMI Takahide, YASUMURA Koki, SHIOZAWA Daiki
    Dec. 2014, Recent Advances in Structural Integrity Analysis: Proceedings of the International Congress (APCF SIF 2014), 47 - 51, English
    [Refereed]
    International conference proceedings

  • T. Makino, Y. Neishi, D. Shiozawa, Y. Fukuda, K. Kajiwara, Y. Nakai
    The objectives of the present paper are to clarify the rolling contact fatigue (RCF) crack path in high strength steel with artificial defects using synchrotron radiation micro-computed tomography (SR micro CT) imaging and to discuss the mechanism of RCF crack propagation by finite element (FE) analysis. Two crack types, a vertical crack and a horizontal crack, were observed around the artificial defect by SR micro CT. The stress intensity factor (SIF) of horizontal cracks, calculated by FE analysis, increased by the existence of vertical cracks. The interaction between these two crack types dominates RCF crack propagation originating from artificial defects. (C) 2014 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Nov. 2014, INTERNATIONAL JOURNAL OF FATIGUE, 68, 168 - 177, English
    [Refereed]
    Scientific journal

  • 放射光ラミノグラフィによる介在物起点の転動疲労き裂の観察
    Makino Taizo, Neishi Yutaka, Nakai Yoshikazu, Shiozawa Daiki
    高輝度光科学研究センター, Sep. 2014, 平成25年度 SPring-8 重点産業化促進課題・一般課題（産業分野）実施報告書（2013B), Japanese
    [Refereed][Invited]
    Research institution

  • 多結晶金属材料における回折コントラストトモグラフィによる金属組織評価の高精度化
    Nakai Yoshikazu, Shiozawa Daiki
    高輝度光科学研究センター, Sep. 2014, 平成25年度 SPring-8 重点産業化促進課題・一般課題（産業分野）実施報告書（2013B）, Japanese
    [Refereed][Invited]
    Research institution

  • Fatigue Limit Estimation Based on Dissipated Energy Measurement for Surface Modified Materials
    INAGAWA Tsuyoshi, SHIOZAWA Daiki, AKAI Atushi, INABA Ken, SAKAGAMI Takahide
    Jul. 2014, Proceedings of 16th International Conference on Experimental Mechanics, English
    [Refereed]
    International conference proceedings

  • Experimental Study of Relationship Between Energy Dissipation and Fatigue Damage Initiation Based on Observation of Slip Band by Atomic Force Microscope
    SHIOZAWA Daiki, INABA Ken, AKAI Atushi, SAKAGAMI Takahide
    Jul. 2014, Proceedings of 16th International Conference on Experimental Mechanics, English
    [Refereed]
    International conference proceedings

  • Sia Chin Voon, Nakai Yoshikazu, Tanaka Hiroshi, Shiozawa Daiki
    In this work, interfacial fracture toughness between treated fiber and matrix was investigated by using double shear test method. Susrface treatment on the oil palm empty fruit bunch (OPEFB) fibers was performed to improve the interfacial bosnding properties of natural fiber reinforced Poly(L-lactide acid) composites. Three fibers model composite and four fibers model composite
    Scientific Research, Apr. 2014, Open Journal of Composite Material, 4, 97 - 105, English
    [Refereed]
    Scientific journal

  • Shiozawa Daiki, Nakai Yoshikazu, Miura Ryotaro, Matsuda Shota
    The three dimensional grain mapping technique for polycrystalline material, which is called X-ray diffraction contrast tomography (DCT) has proposed. In the present study, the measurement of DCT was conducted in SPring-8, which is the brightest synchrotron radiation facility in Japan, and the condition of measurement and data procedure are discussed. Developed technique was app
    Trans. Tech. Pub., Apr. 2014, Materials Science Forum, 783-786, 2359 - 2364, English
    [Refereed]
    Scientific journal

  • AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    The fatigue limit estimation method based on energy dissipation measured by infrared thermography has been introduced in various industries in recent years because of its time and cost effectiveness. In this method, the temperature change due to irreversible energy dissipation during one loading cycle is measured for different levels of applied stress amplitude. The obtained relationship between temperature change and stress amplitude shows a significant inflection at a certain stress level where temperature change due to energy dissipation shows a steep increase. It is known that this stress level coincides with the fatigue limit. In this study, the measurement conditions for appropriate fatigue limit determination based on the energy dissipation are discussed experimentally in conjunction with: (i) the required number of loading cycles in each stress level, (ii) the appropriate number of loading cycles, (iii) the influence of loading history and fatigue damage accumulation, and (iv) the influence of loading frequency.
    非破壊検査協会, Mar. 2014, 非破壊検査, 63(3) (3), 153 - 160, Japanese
    [Refereed]
    Scientific journal

  • SIA C. V, NAKAI Yoshikazu, SHIOZAWA Daiki, OHTANI Hiroto
    Oil palm fiber (OPF) extracted from empty fruit bunches is proven as a good raw material for bio-composites. The statistical variability in single fiber strength was observed due to the randomly distributed flaws along the fiber. In this study, the effect of gauge length on tensile strength of OPFs has been investigated. The Weibull weakest link distribution model was applied t
    Mar. 2014, Open Journal of Composite Materials, 2014, Vol. 4, pp. 72-77., 4, 72 - 77, English
    [Refereed]
    Scientific journal

  • Ti-6Al-4V 合金における内部起点型微小疲労き裂の発生および進展初期過程のμCT イメージングによる観察
    中村 孝, 塩澤 大輝, 中井 善一, 上杉 健太朗
    2014, 平成26 年度SPring-8 成果公開優先利用課題実験報告書, 2014A1020
    Scientific journal

  • Ti-6Al-4V 合金における材料内部組織の放射光μCT イメージングによる非破壊観察
    中村 孝, 塩澤 大輝, 中井 善一, 上杉 健太朗
    2014, 平成26 年度SPring-8 一般課題実験報告書, 2014A1459
    Scientific journal

  • D. Shiozawa, Y. Nakai, T. Murakami, H. Nosho
    In the present study, micro computed tomography (mu CT) imaging by using ultra-bright synchrotron radiation X-ray (SR mu CT), which is generated at a facility located in Japan and called SPring-8 (Super Photon ring-8 GeV), is used to observe torsion fatigue crack propagation behavior in round bars. It is well known that the transition of crack propagation from the shear mode to the tensile mode takes place in the above case. The transition condition, however, was not discussed in detail in the past, since the crack growth behavior under the surface cannot be provided precisely by the conventional techniques, such as optical microscope, scanning electron microscope, and atomic force microscope. A compact torsion fatigue-testing machine has been recently developed to conduct fatigue tests and measurements of SR mu CT concurrently at Spring-8. Therefore, the shape of torsion fatigue cracks can be evaluated quantitatively and nondestructively, and the transition of crack propagation from the shear mode to the tensile mode can be observed three-dimensionally. The condition of the transition of crack propagation is discussed by considering the three-dimensional shape of cracks. (C) 2013 Elsevier Ltd. All rights reserved.
    ELSEVIER SCI LTD, Jan. 2014, INTERNATIONAL JOURNAL OF FATIGUE, 58, 158 - 165, English
    [Refereed][Invited]
    Scientific journal

  • Yoshikazu Nakai, Takuto Imanaka, Daiki Shiozawa
    Combined methods to obtain ultra-fine grain (UFG) alpha-brass samples are proposed. Severe plastic deformation followed by recrystallization was conducted, where multiple rolling and equal channel angular pressing (ECAP) were employed. Recrystallization was accomplished by heat-treatment after the severe plastic deformation, and the grain size after the severe plastic deformation was decreased. By multiple rolling, plates with thickness of 0.1 mm and grain size of 1.0 mu m were obtained. By ECAP process, square bar with cross-section of 6 mm x 6 mm and minimum grain size of 4.1 mu m was obtained. The 0.2 % proof strength, ultimate tensile strength, and fatigue limit were increased with the value of inverse square root of grain size (Hall-Petch relationship). Then, the 0.2 % proof strength of UFG brass was tenfold, the ultimate tensile strength and the fatigue limit were two fold increases from the conventional alpha-brass. Because of the high strength, the scatter of fatigue strength of UFG brass was large, which reflects the sensitivity to defects in material.
    TRANS TECH PUBLICATIONS LTD, 2014, 11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2, 891-892, 1125 - 1130, English
    [Refereed]
    International conference proceedings

  • Shiozawa Daiki, Inaba Ken, Akai Atsushi, Sakagami Takahide
    In recent years, fatigue limit estimation based on dissipated energy has been introduced in various industries because of its time and cost effectiveness. However, the mechanism of energy dissipation and the relationship between energy dissipation and fatigue damage have not been investigated well. In this study, mechanism of energy dissipation is investigated in relation with formulation of slip bands for JIS type 316L stainless steel through observation of slip bands by optical microscope and atomic force microscope.
    TRANS TECH PUBLICATIONS LTD, 2014, 11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2, 891-892, 606 - +, English
    [Refereed]
    International conference proceedings

  • Daiki Shiozawa, Yoshikazu Nakai, Ryotaro Miura, Shota Matsuda
    The three dimensional grain mapping technique for polycrystalline material, which is called X-ray diffraction contrast tomography (DCT) has proposed. In the present study, the measurement of DCT was conducted in SPring-8, which is the brightest synchrotron radiation facility in Japan, and the condition of measurement and data procedure are discussed. Developed technique was applied to aluminium alloy and stainless steel. The shape and location of grain could be determined by the developed three-dimensional mapping technique using the apparatus in a bending beam line of SPring-8. To evaluate plastic deformation, the grain orientation spreads of individual grains were measured. The grain orientation spread is caused by the mosaicity, which relates to the dislocation structure in a grain. The grain orientation spread was found to increase with increasing plastic strain. Fatigue damage also could be evaluated by the grain orientation spread in the DCT measurement.
    TRANS TECH PUBLICATIONS LTD, 2014, 11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2, 891-892, 600 - 605, English
    [Refereed]
    International conference proceedings

  • D. Shiozawa, T. Makino, Y. Neishi, Y. Nakai
    Micro computed laminography imaging using ultra -bright synchrotron radiation (SRCL) was applied to the observation of flaking defects under rolling contact fatigue (RCF) of a high strength steel. Specially fabricated inclusion rich steel plate specimens were employed for the experiments. RCF fatigue tests were carried out near the measurement hatch of SRCL for successive observation of crack initiation and growth behaviors. Specimens before and after the initiation of flaking were observed by SRCL, and the flaking defects and cracks under the surface were successfully detected. The shape and location of RCF crack obtained by SRCL imaging were almost coincident with those obtained by SEM, and detail process of crack initiation and flaking in RCF process can be discussed. (C) 2014 Elsevier Ltd.
    ELSEVIER SCIENCE BV, 2014, 20TH EUROPEAN CONFERENCE ON FRACTURE, 3, 159 - 164, English
    [Refereed]
    International conference proceedings

  • Daiki Shiozawa, Sota Okada, Yoshikazu Nakai
    It is difficult to evaluate the corrosion pit using normal observation methods because of the complex shape of the pit and its passive film. In this study, measurements of pit and crack formation in corrosion fatigue tests of highstrength aluminum alloy, 7075-T651 were conducted by synchrotron radiation CT imaging. 3D/4D analysis was applied to the observation of corrosion pit growth and crack initiation in corrosion fatigue tests. Pits and inclusions were recognized individually in 3D/4D analysis. The corrosion pits showed complex shapes, and parts of pits grew under the surface of specimens along inclusions. It was found that the behavior of the corrosion pit under the surface was affected by the inclusions distribution. The stress intensity factor range ΔK was calculated based on the measured shape and dimensions of the corrosion pit. The value of ΔK increased with increasing loading cycles, and the value of Δ K at the location of crack initiation indicated larger than 0.9 MPa m1/2, which was similar to the threshold stress intensity factor range ΔKth for corrosion fatigue of A7075-T651.
    Japan Institute of Light Metals, 2014, Keikinzoku/Journal of Japan Institute of Light Metals, 64(11) (11), 564 - 569, Japanese
    [Refereed]
    Scientific journal

  • Atsushi Akai, Daiki Shiozawa, Takahide Sakagami
    In recent years, fatigue limit estimation based on dissipated energy is being introduced in various industries because of its time and cost effectiveness. However, the energy dissipation mechanism and the relationship between energy dissipation and fatigue damage have not been well investigated. In the 1st report, the present authors conducted fatigue limit estimation based on dissipated energy measurement and conventional fatigue test for JIS type 304 and 316L austenitic stainless steel. We found that the fatigue limit of the type 316L steel could be precisely estimated, although estimated fatigue limit of the type 304 steel was conservative values compared with that obtained by conventional fatigue tests. It was considered that the fatigue limit estimation method based on dissipated energy could not evaluate the microstructure change, such as dislocation and phase transformation during short cyclic loading. In this study, fatigue tests under the constant stress amplitude were conducted for austenitic stainless steel to investigate the relationship between dissipated energy and microstructure change during fatigue tests. It was found for the type 316L steel that tendency of the observed dissipated energy during the fatigue tests was similar as that of plastic strain energy. On the other hand, for the type 304 steel, the dissipated energy decreased in spite of increasing plastic strain energy around N = 105cycles, when the applied stress amplitude was close to the actual fatigue limit. It is considered from the observation of the change in martensitic volume fraction, the decrease of dissipated energy was caused by the martensitic transformation some amount of irreversible plastic strain energy was consumed for phase transformation. It was found from the experimental studies that dissipated energy reflects the microstructure changes, such as material softening, hardening and martensitic phase transformation. Therefore, the condition of the number of cycles in the fatigue limit estimation based on the dissipated energy should be changed depending on the behavior of microstructure change in material under cyclic loading. © 2013 The Society of Materials Science, Japan.
    日本材料学会, Sep. 2013, Zairyo/Journal of the Society of Materials Science, Japan, 62(9) (9), 554 - 561, Japanese
    [Refereed]
    Scientific journal

  • 回折コントラストトモグラフィによる多結晶金属材料の疲労損傷評価
    NAKAI YOSHIKAZU, SHIOZAWA DAIKI
    Jun. 2013, 平成25年度 SPring-8 重点産業利用課題・一般課題(産業分野)実施報告書（2013A）, 2013A, 1645, Japanese
    [Refereed][Invited]
    Research institution

  • 結晶粒3Dマッピング法を用いた塑性ひずみの評価
    NAKAI Yoshikazu, SHIOZAWA Daiki
    Feb. 2013, 平成24年度 SPring-8 重点産業利用課題・一般課題(産業分野)実績報告書（2012A）, 56 - 59, Japanese
    [Refereed]
    Research society

  • Atsushi Akai, Daiki Shiozawa, Takahide Sakagami
    In recent years, fatigue limit estimation based on dissipated energy is getting an increasing attention in various industries because of its time and cost effectiveness. Heat treatment is applied to the material and machine components for the improvement of the mechanical properties. In this study, fatigue limit estimation based on dissipated energy measurement was applied to the evaluation of heat treated materials. Fatigue limit estimation by energy dissipation and conventional fatigue tests were conducted for as-received materials and re-solution heat treated materials of JIS type 304 steel to investigate the influence of grain size and the change of mechanical properties on energy dissipation. It was found from the fatigue limit estimation by energy dissipation that the fatigue limit of the re-solution heat treated materials could be precisely estimated, although estimated fatigue limit of the as-received materials obtained by energy dissipation was conservative values compared with that obtained by conventional fatigue tests. In conventional fatigue tests, volume fraction of martensite and its changing rate in the re-solution heat treated materials are less than those in the as-received materials. Therefore, the influence of the phase transformation to the re-solution heat treated materials was smaller than that to the as-received materials. The relationship between the dissipated energy and the plastic strain energy was also investigated. The dissipated energy in both materials could plot in the same straight line against plastic strain energy. The results in type 316L also plotted in the same line. It was found that materials with the same thermal property has same relationship between dissipated energy and plastic strain, even though mechanical properties of material are different from each other thus the energy dissipation has a close relationship with plastic deformation. © 2013 The Japan Society of Mechanical Engineers.
    Japan Society of Mechanical Engineers, 2013, Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 79(807) (807), 1581 - 1592, Japanese
    [Refereed]
    Scientific journal

  • Atsushi Akai, Daiki Shiozawa, Takahide Sakagami
    In recent years, fatigue limit estimation based on energy dissipation has been getting considerable attentions. In this method, temperature change due to irreversible energy dissipation is measured by infrared thermography for various levels of stress amplitude. It is known that the dissipated energy increases with increasing stress levels, and a certain stress level where the change in dissipated energy shows sharp increase coincides with fatigue limit. However, cause and effect relationship between energy dissipating mechanism and fatigue damage has not been investigated well. In this study, effect of phase transformation on fatigue limit estimation based on dissipated energy is investigated for austenitic stainless steel. Fatigue limit estimation based on dissipated energy and conventional fatigue test were conducted for JIS type 304 and type 316L austenitic stainless steel. It was found from experimental studies that fatigue limit of 316L stainless steel obtained from dissipated energy coincided with that by conventional fatigue test on the other hand fatigue limit of type 304 stainless steel estimated by dissipated energy measurement gave conservative value compared with that by conventional fatigue test. In the case of type 304 stainless steel, plastic deformation led to a phase transformation from austenite into martensite. As the result, amount of emitted dissipated energy decreased since some amount of irreversible plastic strain energy was consumed for phase transformation, and this affected on the fatigue limit estimation based on energy dissipation. © 2012 The Society of Materials Science, Japan.
    Dec. 2012, Zairyo/Journal of the Society of Materials Science, Japan, 61(12) (12), 953 - 959, Japanese
    [Refereed]
    Scientific journal

  • オーステナイト系ステンレス鋼の疲労限度評価
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    Dec. 2012, 材料, 61(12) (12), 953 - 959, Japanese
    [Refereed]
    Scientific journal

  • Observation of Fatigue Crack Propagation Mode Transition under Cyclic Torsion Using Micro-CT Imaging with Ultra-Bright Synchrotron Radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki, MURAKAMI Tomonori, NOSHO Hiroaki
    Sep. 2012, Proceedings of the 4th International Conference on Crack Paths (CD-ROM), 035, English
    [Refereed]
    International conference proceedings

  • RELATIONSHIP BETWEEN DISSIPATED ENERGY AND FATIGUE LIMIT FOR AUSTENITIC STAINLESS STEEL
    Atsushi Akai, Daiki Shiozawa, Takahide Sakagami, Shogo Otobe, Ken Inaba
    Recently, rapid prototype modeling is required in industry due to accelerated production cycles. Therefore, effective fatigue life design method is required taking the place of conventional laboratory fatigue test based on 10 million stress cycles. Therefore, fatigue limit estimation based on energy dissipation measured by infrared thermography has been getting an increasing attention, because of its time and cost effectiveness. This technique has been welcomed mainly in automotive industries for evaluating fatigue limit of steel for automobile bodies. However the fundamental principle of this method has not been clarified yet. In this study, fatigue test is conducted for austenitic stainless steel. Temperature change due to dissipated energy, martensite fraction and strain are continuously measured to discuss energy dissipation mechanism related to plastic strain and transformation of microstructure during fatigue test.
    INEGI-INST ENGENHARIA MECANICA E GESTAO INDUSTRIAL, 2012, ICEM15: 15TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, PAPER REF 2600, pp.1 - 9, English
    [Refereed]
    International conference proceedings

  • OBSERVATION OF CRACKS IN CARBON STEEL UNDER CONTACT ROLLING FATIGUE BY MICRO CT IMAGING USING ULTRA-BRIGHT SYNCHROTRON RADIATION
    Yoshikazu Nakai, Daiki Shiozawa, Yoshiyuki Fukuda, Yutaka Neishi, Taizo Makino
    Micro computed tomography imaging using ultra-bright synchrotron radiation (SR mu CT) was applied to the observation of flaking defects under rolling contact fatigue (RCF) of a carbon steels. The specimens with artificial defects, which simulated inclusions, were employed for the fatigue tests. Samples before and after the initiations of flaking were observed by the SR mu CT, and the flaking defects and cracks were successfully detected. The shape and location of RCF crack obtained by SR mu CT imaging were almost consistent with those obtained by SEM. It was found that the detail process of crack initiation and flaking in the rolling contact fatigue process could be discussed from the results obtained by SR mu CT.
    INEGI-INST ENGENHARIA MECANICA E GESTAO INDUSTRIAL, 2012, ICEM15: 15TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, 2635, English
    [Refereed]
    International conference proceedings

  • DEVELOPMENT OF THREE-DIMENSIONAL GRAIN MAPPING TECHNIQUE IN SPRING-8 AND EVALUATION OF PLASTIC STRAIN
    Daiki Shiozawa, Yoshikazu Nakai, Kenta Tsutsumi, Ryotaro Miura, Kentaro Kajiwara
    The three dimensional grain mapping technique for polycrystalline material, that is termed Xray diffraction contrast tomography (DCT) has proposed. In the present study, the measurement of DCT were conducted in SPring-8 and the condition of measurement and data procedure were discussed. Developed technique was applied to aluminium alloy and stainless steel. It was found that the shape and location of grain can be determined by three-dimensional mapping technique using the apparatus in SPring-8, BL19B2 bending beam line. Next, for evaluation of plastic deformation, the internal grain orientation spread of the individual grain was counted. The grain orientation spread is caused by the mosaicity, which related to the change of microstructure. The grain orientation spread increased with increased in the tension stress in the plastic deformation region. It is possible to evaluate fatigue damage in microstructure, such as crack initiation, by the DCT technique and using the grain orientation spread as one of the fatigue damage parameters.
    INEGI-INST ENGENHARIA MECANICA E GESTAO INDUSTRIAL, 2012, ICEM15: 15TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, CD-ROM(2772) (2772), English
    [Refereed]
    International conference proceedings

  • DEVELOPMENT OF THREE-DIMENSIONAL GRAIN MAPPING TECHNIQUE IN SPRING-8 AND EVALUATION OF PLASTIC STRAIN
    Daiki Shiozawa, Yoshikazu Nakai, Kenta Tsutsumi, Ryotaro Miura, Kentaro Kajiwara
    The three dimensional grain mapping technique for polycrystalline material, that is termed Xray diffraction contrast tomography (DCT) has proposed. In the present study, the measurement of DCT were conducted in SPring-8 and the condition of measurement and data procedure were discussed. Developed technique was applied to aluminium alloy and stainless steel. It was found that the shape and location of grain can be determined by three-dimensional mapping technique using the apparatus in SPring-8, BL19B2 bending beam line. Next, for evaluation of plastic deformation, the internal grain orientation spread of the individual grain was counted. The grain orientation spread is caused by the mosaicity, which related to the change of microstructure. The grain orientation spread increased with increased in the tension stress in the plastic deformation region. It is possible to evaluate fatigue damage in microstructure, such as crack initiation, by the DCT technique and using the grain orientation spread as one of the fatigue damage parameters.
    INEGI-INST ENGENHARIA MECANICA E GESTAO INDUSTRIAL, 2012, ICEM15: 15TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, 2772, English
    [Refereed]
    International conference proceedings

  • Dissipated energy evaluation during fatigue test for austenitic stainless steel with thermography
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会, Sep. 2011, Proc. of ATEM’11 International Conference on Advanced Technology in Experimental Mechanics 2011, CD-ROM, 121 - 122, English
    International conference proceedings

  • Daiki Shiozawa, Yoshikazu Nakai, Tomonori Murakami, Hiroaki Nosho
    In the present study, synchrotron radiation micro computed tomography (SR mu CT) imaging of SPring-8 was applied to the observation of the torsion fatigue crack propagation behavior. The transition of crack propagation from Mode II to I occurs under torsion fatigue. The conventional technique, such as optical microscope and scanning microscope, cannot give us the crack growth behavior under the surface. Therefore, the transition of crack propagation could not be discussed in detail. The compact torsion fatigue-testing machine was developed for fatigue testing at SPring-8, and the torsion fatigue tests and measurements of SR micro-CT were carried out alternately. The shape of torsion fatigue cracks could be evaluated quantitatively and nondestructively. Transition of crack propagation from Mode II to Mode I under the surface could be observed. The condition of transition of crack propagation was discussed by using three-dimensional shape of cracks. (C) 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of ICM11
    ELSEVIER SCIENCE BV, 2011, 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL BEHAVIOR OF MATERIALS (ICM11), 10, 1479 - 1484, English
    [Refereed]
    International conference proceedings

  • Yoshikazu Nakai, Daiki Shiozawa
    Measurement of shape and dimension of pits and cracks formed in corrosion fatigue tests of a high-strength aluminium alloy, 7075-T651 were conducted by computed-tomography using ultra bright synchrotron radiation X-ray. Complex corrosion process could be observed and detail shapes of corrosion pits could be identified. Sometimes, corrosion pit and corroded area were formed under passive film, and those were not observed from the surface.
    TRANS TECH PUBLICATIONS LTD, 2011, EXPERIMENTAL MECHANICS AND MATERIALS, 83, 162 - 167, English
    [Refereed]
    International conference proceedings

  • SHIOZAWA Daiki
    The Society of Materials Science, Japan, 2010, journal of the Japan Society for Testing Materials, 59(10) (10), 814 - 814

  • Yoshikazu Nakai, Daiki Shiozawa, Takayuki Kurimura, Kentaro Kajiwara
    Micro computer-tomography (mu CT) using ultrabright synchrotron radiation was applied to observe the shape of fretting fatigue cracks in a titanium alloy. Three dimensional shape and coalescence of fretting fatigue cracks could be observed, and the shapes of the cracks obtained by the imaging agreed well with that obtained by the stereogram analysis of fracture surface using scanning electron microscopy. Transition of crack propagation mode inside specimen in fretting fatigue also could be observed nondestructively.
    SPIE-INT SOC OPTICAL ENGINEERING, 2010, FOURTH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, 7522, English
    [Refereed]
    International conference proceedings

  • Daiki Shiozawa, Yoshikazu Nakai, Tomonobu Murakami
    In the present study, synchrotron radiation micro computed tomography (SR mu CT) imaging of SPring-8 was applied to the observation of the torsion fatigue crack propagation behavior. The transition of crack propagation from Mode II to I occurs under torsion fatigue. The conventional technique, such as optical microscope and scanning microscope, cannot give us the crack growth behavior under the surface. Therefore, the transition of crack propagation could not be discussed in detail. The compact torsion fatigue-testing machine was developed for fatigue testing at SPring-8, and the torsion fatigue tests and measurements of SR micro-CT were carried out alternately. The shape of torsion fatigue cracks could be evaluated quantitatively and nondestructively. Transition of crack propagation from Mode II to Mode I under the surface could be observed. The condition of transition of crack propagation was discussed by using three-dimensional shape of cracks. (C) 2010 Published by Elsevier Ltd.
    ELSEVIER SCIENCE BV, 2010, FATIGUE 2010, 2(1) (1), 1413 - 1419, English
    [Refereed]
    International conference proceedings

  • Y. Nakai, D. Shiozawa
    Measurements of the shape and dimensions of the pits and cracks formed in corrosion fatigue tests of a high-strength aluminium alloy, 7075-T651 were conducted by computed-tomography using ultra bright synchrotron radiation X-ray. Complex corrosion process could be observed and detail shape of corrosion pits could be identified. Sometimes, corrosion pit was formed under passive film, and those were not observed from the surface.
    E D P SCIENCES, 2010, ICEM 14: 14TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, VOL 6, 6, English
    [Refereed]
    International conference proceedings

  • Daiki Shiozawa, Takashi Fujimoto, Naoki Arino, Yoshikazu Nakai
    SQUID (Superconducting Quantum Interface Device) has high magnetic sensitivity and high magnetic resolution. In this study, high-temperature SQUID microscope was applied to the detection of defects in printed wire. SQUID microscope with high permeability needle (flux guide) showed high spatial resolution measurement of the sample in air at room temperature. The distribution of magnetic field around printed wires that subjected to DC current was measured. The results of measuring magnetic field for 0.7mm line and spacing meander lines showed the effect of flux guide on spatial resolution improvement. The distribution of magnetic field around the printed wire with defects has been analyzed numerically. It was found that the magnetic field distribution and magnetic field gradient showed that changes according to the parameters of defect such as defect width and location. SQUID microscope was applied to inspect the imperfections in the width and thickness of the printed wire. It was found from these measurements that the SQUID microscope could measure the changes in magnetic field distribution induced by the imperfection in the width and thickness. The shape of measured magnetic field distribution for printed wire having the defect in width was similar to that of calculated distribution. Defect in small sized wires with the width of 200μm also could be detected by the measured magnetic field gradient distribution. © 2009 The Society of Materials Science.
    Oct. 2009, Zairyo/Journal of the Society of Materials Science, Japan, 58(10) (10), 808 - 814, Japanese
    [Refereed]
    Scientific journal

  • Observation of Fretting Fatigue Cracks by Micro Computed Tomography with Synchrotron Radiation
    SHIOZAWA Daiki, NAKAI Yoshikazu, KURIMURA Takayuki, KAJIWARA Kentaro
    May 2009, Proceedings of the 12th International Conference on Fracture (ICF-12), CD-ROM, English
    [Refereed]
    Scientific journal

  • Daiki Shiozawa, Yoshikazu Nakai, Takayuki Kurimura, Yasushi Morikage, Hiroshi Tanaka, Hideki Okado, Takuya Miyashita, Kentaro Kajiwara
    In the present study, the ultra-bright synchrotron radiation X-ray was applied to the observation of small cracks in steels. It is important to investigate the applicability of synchrotron radiation X-ray and several parameters for the observation of defects in steels, which is widely used in industrial structures. The Synchrotron radiation X-ray micro computed tomography (SR-μCT) was applied to the three-dimensional observation of small cracks which were initiated either in fretting or in torsion fatigue test. It was found that phase contrast imaging technique has enabled the reconstruction of clear crack images with small opening displacement of about 1μm or submicron scale. The shapes of surface and inside cracks obtained by SR-μCT were agreed well with those by the scanning electronic microscopy. SR-μCT can also display characteristic inside shape of fretting fatigue cracks those were not perpendicular to the body axis and coalesced each other under surface. Torsion fatigue cracks of 10-15μm in depth can be also observed in high-strength steel using SR-μCT. © 2007 The Society of Materials Science.
    Oct. 2007, Zairyo/Journal of the Society of Materials Science, Japan, 56(10) (10), 951 - 957, Japanese
    [Refereed]
    Scientific journal

  • Fatigue Damage Evaluation of SUS304 Steel Using Magnetism Change in Fatigue Process
    Daiki Shiozawa, Yoshikazu Nakai, Yoshitaka Eijima
    Sep. 2007, Proceedings of ATEM'07, CD-ROM, English
    [Refereed]
    Scientific journal

  • Observation of Inclusions and Defects in Steels by Micro Computed-tomography using Ultrabright Synchrotron Radiation
    Yoshikazu Nakai, Daiki Shiozawa, Yasushi Morikage, Takayuki Kurimura, Hiroshi Tanaka, Hideki Okado, Takuya Miyashita
    Aug. 2007, Fourth International Conference on Very High Cycle Fatigue, Edited by John E. Allison, J. Wayne Jones, James M. Larsen, and Robert O. Ritchie, TMS, Warendale, Pennsylvania, pp.67-72, English
    [Refereed]
    International conference proceedings

  • FUJIMOTO Takashi, NAKAI Yoshikazu, SHIOZAWA Daiki, ARINO Naoki
    SQUID (Super conducting Quantum interference device) has high magnetic sensitivity and high magnetic resolution. Minute magnetic fields up to 10^-8 gauss can be detected by SQUID. Therefore, Nondestructive Testing (NDT) using SQUID can detect the change in magnetic field distribution due to the small defect that cannot be detected by conventional NDT method. The measurement system using SQUID was developed and applied to detect the current path by the measured magnetic field distribution when DC current was applied. It was found that the location of current path and size of line spacing could be identified by measured magnetic field. The measurement system using SQUID could measure the change in the magnetic filed distribution due to the notch in current path. It was considered from these results that the small defect in current path could be detected and evaluated from the magnetic field distribution measured by SQUID.
    The Japan Society of Mechanical Engineers, 2007, The proceedings of the JSME annual meeting, 2007, 283 - 284, Japanese

  • NAKAI Yoshikazu, SIOZAWA Daiki, EIJIMA Yoshitaka
    For the detection of fatigue damage before crack initiation in an austenitic stainless steel,SUS304, we investigated the possibility of the fatigue damage detection and evaluation from the change in the magnetization. Fatigue tests and measurements of magnetization conducted under the stress ration, R, of -1. The experimental results showed that the location, where the maximum changes in the value of the changes in the leakage magnetic flux density B_z observed, coincided with the location of the stress concentration, where the crack was formed, and the value of B_z rapidly increased before crack initiation. When no crack was found, increasing rate of B_z decreased with increasing the number of cycles, and the value of B_z was saturated to a certain value. It was found that fatigue damage before crack initiation can be detected from the change in the magnetization in SUS304 steel.
    The Japan Society of Mechanical Engineers, 2007, The proceedings of the JSME annual meeting, 2007, 295 - 296, Japanese

  • K. Nakatani, S. Kubo, T. Sakagami, D. Shiozawa, M. Takagi
    When a piezoelectric film is glued on the surface of a structure member subjected to mechanical load, a distribution of electric potential is induced. In the existence of defects in the member, a characteristic variation of electric potential is observed. Based on this phenomenon, the passive electric potential CT (computed tomography) method is developed for detecting and identifying defects in a structure. In this study, the applicability of the passive electric potential CT method to the identification of a delamination in a CFRP laminate was experimentally examined. CFRP laminate specimens, which have an artificial interlaminer delamination, with a piezoelectric film on their surface were subjected to three-point bending. The electric potential distribution on the piezoelectric film was measured by a non-contact voltmeter. Characteristic variation reflecting the location and the size of the delamination is observed in the measured electric potential distributions. To identify the delamination, an inverse method was constructed based on the least-squares residual evaluated between the measured and computed electric potential distributions. The location and size of the delamination were estimated accurately. It was shown that the passive electric potential CT method using a piezoelectric film was useful for the quantitative identification of interlaminar delamination in laminated composite materials. © 2007 IOP Publishing Ltd.
    Institute of Physics Publishing, Jan. 2007, Measurement Science and Technology, 18(1) (1), 49 - 56, English
    [Refereed]
    International conference proceedings

  • Shiozawa Daiki, Nakai Yoshikazu, Morikage Yasushi, Tanaka Hiroshi, Okado Hideki, Miyashita Takuya
    The observation of internal microstructures in materials is important to elucidate the mechanisms of ultra-long life fatigue of high-strength steels, and to ensure the integrity of structures. By conventional techniques, such as laboratory X-ray and ultrasonic imaging, the size and shape of subsurface non-metallic inclusions and cracks, those are smaller than 100μm, cannot be measured. Then, in the present study, the ultra-bright synchrotron radiation X-ray was applied to the imaging of subsurface inclusion. To obtain basic data for the measurement, the penetration depth of synchrotron radiation wave in a free-cutting steel was examined. It was found that the depths where the transmitted wave cannot be observed are 100μm for 15 keV, 200μm for 20 keV, 600μm for 25 keV, and 800μm for 30 keV. For the measurement of size and shape of inclusion, synchrotron radiation computed tomography method (SR-CT) was employed. Metallographic structures can be observed in a free-cutting steel, and the diameter of these structures is about 7-10μm. They are considered to be inclusions, which mainly contain manganese sulfide (MnS) or pearlitic phase. To investigate the possibility of detection of pearlitic phase, SR-CT was applied to observe the metallographic structures in carbon steel (S35C), which contains a lot of pearlitic phase and a little inclusion. In this case, no metallographic structure was observed inside specimen. These results indicate that the microstructures those were observed by SR-CT method was inclusions, not pearlitic phase.
    The Japan Society of Mechanical Engineers, Dec. 2006, 日本機械学会論文集, 72巻724号1846-1852(724) (724), 1846 - 1852, Japanese
    [Refereed]
    Scientific journal

  • Quantitative Analysis of Inclusions and Fatigue Cracks in Steel by X-ray Computed Tomography Using Ultra-bright Synchrotron Radiation
    Yoshikazu Nakai, Daiki Shiozawa, Hiroshi Tanaka, Yasushi Morikage, Hideki Okado, Takuya Miyashita
    Sep. 2006, New Methods of Damage and Failure Analysis of Structural Parts, pp.277-286, English
    [Refereed]
    Scientific journal

  • Daiki Shiozawa, Shiro Kubo, Takahide Sakagami
    In this paper, we examine the applicability of the passive electric potential CT (computed tomography) method to the quantitative identification of three-dimensional cracks in structures. In this method, a piezoelectric film is glued on the surface of structures. The electric potential values on the piezoelectric film change due to the strain distribution on the surface of the structures, when the structures are subjected to an external load. The strain distribution induces an electric potential distribution on the piezoelectric film. Then, this method does not require electric current application, and passively observed electric potential values on piezoelectric film can be used for crack identification. The electric potential distribution on piezoelectric film was investigated numerically and experimentally. It was found that the electric potential distribution shows a characteristic change corresponding to the shape of the surface crack. An inverse method based on the least residual method was applied to crack identification from the electric potential distribution. In this inverse method, the square sum of residuals is evaluated between the measured electric potential distributions and those computed from the electric potential distribution of the piezoelectric film. Three-dimensional surface cracks were identified from the measured electric potential distribution. It was found that the location and size of the crack can be quantitatively estimated using a two-dimensional distribution of electric potential.
    JAPAN SOC MECHANICAL ENGINEERS, Jul. 2006, JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING, 49(3) (3), 426 - 435, English
    [Refereed]
    Scientific journal

  • Passive electric potential CT method using piezoelectric material for identification of plural cracks
    D Shiozawa, S Kubo, T Sakagami, M Takagi
    The passive electric potential CT (computed tomography) method using piezoelectric film was applied to the identification Of Plural through cracks. The use of piezoelectric material made it possible to obtain electric potential field without applying electric current. For identification of cracks ail inverse analysis scheme based on the least residual method was applied, in which square sum of residuals is evaluated between the measured electric potential distributions and those computed by using the finite element method. The Akaike information criterion (AIC) was used to estimate the number of cracks. Numerical simulations were carried out oil the identification of plural cracks and a single crack. The location and size of these cracks were quantitatively estimated by the present method. The number of cracks was correctly estimated, even when the plural cracks were closely located and the measured electric potential distribution was similar to that for a single crack.
    TECH SCIENCE PRESS, Jan. 2006, CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES, 11(1) (1), 27 - 36, English
    [Refereed]
    Scientific journal

  • An Experimental Study on Applicability of Passive Electric Potential CT Method to Identification of Three-dimensional Surface Crack
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    Jul. 2005, 日本機械学会論文集A編, 第71巻707号pp. 1038-1045, Japanese
    [Refereed]
    Scientific journal

  • Active and passive electric potential ct methods incorporating inverse analysis schemes for crack and defect identification
    Shiro Kubo, Takahide Sakagami, Daiki Shiozawa
    The active and passive electric potential CT (Computed Tomography) methods incorporating inverse analysis schemes for crack identification using the inverse analyses are described. The active method uses the electric potential distribution observed on the surface of the body under electric current application to identify the cracks and defects. The inverse analysis methods were constructed based on comparison between the measured electric potential and that calculated using the boundary element method. The passive electric potential CT method, which does not require the application of the electric current, can be constructed by gluing piezoelectric film on the surface of a cracked structure subjected to mechanical load. The electric potential incurred by mechanical load was used to identify cracks and defects. The electric filed was calculated by applying the finite element method, which takes into account the coupled effect of the strain field and the electric field. The applicability of the passive electric potential CT method was examined numerically and experimentally for a two-dimensional through-crack model. It was found that a characteristic electric potential distribution appeared on the piezoelectric film. The crack can be identified from the electric potential distribution.
    2005, 11th International Conference on Fracture 2005, ICF11, 5, 3727 - 3732, English
    International conference proceedings

  • SHIOZAWA Daiki, NAKAI Yoshikazu, YOKOTA Masaki, TERAMOTO Norihiro
    The Japan Society of Mechanical Engineers, 2005, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2005, 479 - 480, Japanese

  • An experimental study on applicability of passive electric potential CT method to crack identification
    D Shiozawa, S Kubo, T Sakagami
    This paper describes the applicability of passive electric potential CT (computed tomography) method which does not require electric current application for damage detection. In this method, piezoelectric film is glued on the surface of structures as a sensor. Electric potential values on the piezoelectric film change due to the strain distribution on the structure, when the structure is subjected to external load. The strain distribution of the cracked body induces a characteristic electric potential distribution on the piezoelectric film. Therefore passively observed electric potential values on piezoelectric film can be used for the defect identification. An inverse method based on the least residual method was applied to the crack identification from the electric potential distribution. In this inverse method, square sum of residuals is evaluated between the measured electric potential distributions and those computed by using the finite element method. This method may be applied to develop an intelligent structure with a function of self-monitoring of flaws and defects. The electric potential on piezoelectric film was measured by the contact type and the non-contact type methods. The measured electric potential distribution was used to identify a crack by using the present inverse method. It was found that the location, size and depth of the crack can be quantitatively identified by the passive electric potential CT method.
    JAPAN SOC MECHANICAL ENGINEERS, Jul. 2004, JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING, 47(3) (3), 419 - 425, English
    [Refereed]
    Scientific journal

  • D Shiozawa, S Kubo, T Sakagami
    When the piezoelectric film is glued on the surface of a cracked material subjected to mechanical load, change in electric potential distribution is observed on the surface of the film. Based on this phenomenon, the passive electric potential CT ( computed tomography) method can be developed, which does not require electric current application for identifying cracks. This method may be applied to develop an intelligent structure with a function of self-monitoring of flaws and defects. For the crack identification from electric potential distribution, an inverse method based on the least residual method was applied, in which square sum of residuals are evaluated between the measured electric potential distributions and those computed by using the finite element method. Numerical simulations were carried out on identification of a through-thickness transverse crack. It was found that the location and size of the crack can be quantitatively identified by the proposed passive electric potential CT method.
    TAYLOR & FRANCIS LTD, Feb. 2004, INVERSE PROBLEMS IN SCIENCE AND ENGINEERING, 12(1) (1), 71 - 79, English
    [Refereed]
    Scientific journal

  • SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 2004, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2004, 291 - 292, Japanese

  • NAKATANI Kensaku, SHIOZAWA Daiki, OKAZAKI Shunsuke, KUBO Shiro, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 2004, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2004, 299 - 300, Japanese

  • TAKAGI Masaaki, SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 2003, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2003, 1041 - 1042, Japanese

  • TAKAGI Masaaki, SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    When a piezoelectric film is glued on the surface of a cracked structure subjected to mechanical load, change in distribution of electric potential is observed on the surface of piezoelectric film. Based on this phenomenon, the passive electric potential CT (computed tomography) method was developed for the identification of two- and three-dimensional cracks based on the FEM inverse analysis. In this paper, this method was applied to identify through-thickness inclined crack. Electric potential distribution calculated by the FEM showed characteristic changes corresponding to angle and size of crack. Numerical simulations were carried out on estimation of location, size, and angle of the inclined crack. It was found that the passive electric potential CT method using piezoelectric film was useful for the quantitative identification of the through-thickness inclined crack.
    The Japan Society of Mechanical Engineers, 2003, The proceedings of the JSME annual meeting, 2003, 103 - 104, Japanese

  • Daiki Shiozawa, Shiro Kubo, Takahide Sakagami
    This chapter describes the feasibility of passive electric potential Computed Tomography (CT) method which does not require electric current application for detection of damage in laminated composites. In this method, piezoelectric film is glued on the surface of composites as a sensor. Electric potential values on the piezoelectric film change because of the strain distribution on the composite, when the composite is subjected to external load. The strain distribution of the cracked body shows a characteristic electric potential distribution. Therefore, passively observed electric potential values on piezoelectric film can be used for defecting identification. This method may be applied to develop an intelligent structure with a function of self-monitoring of flaws and defects. An inverse method based on the least residual method is applied to the defect identification from the electric potential distribution. In this inverse method, square sum of the residuals are evaluated between the measured electric potential distributions and those computed by using the finite element method. Numerical simulations are carried out on the estimation of the location and size of delamination defect in composites. It is found that the location, size, and depth of the defect can be quantitatively identified by the passive electric potential CT method. © 2003 Elsevier B.V. All rights reserved.
    Elsevier Ltd., 2003, Inverse Problems in Engineering Mechanics IV, 195-203, 195 - 203, English
    [Refereed]
    In book

  • SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKUNO Kousuke
    When the piezoelectric film is glued on the surface of a cracked material subjected to mechanical load, change in distribution of electric potential is observed on the surface of piezoelectric film. Based on this phenomenon, the passive electric potential CT (computed tomography) method was proposed for identifying two- and three-dimensional cracks. This method uses passively observed electric potential distribution on piezoelectric film induced by the strain distribution of the objective body without applying electric current. Therefore, this method can be applied to develop an intelligent structure with a function of self-monitoring of flaws and defects. In this paper, the passive electric potential CT method using a piezoelectric material is applied to the identification of a through-thickness transverse crack. The effects of crack size and location on electric potential distribution were examined by using the finite element method. For the identification of cracks from electric potential distribution, an inverse method based on the least residual method is applied, in which square sum of residuals are evaluated between the measured electric potential data and those computed by using the finite element method. The crack was identified from experimentally observed electric potential distribution. It was found that the location and size of the crack can be quantitatively identified by the passive electric potential CT method.
    The Society of Materials Science, Japan, Aug. 2002, Journal of the Society of Materials Science, Japan, 51(8) (8), 926 - 931, Japanese

  • OKAZAKI Shunsuke, KUBO Shiro, SAKAGAMI Takahide, SHIOZAWA Daiki
    The Japan Society of Mechanical Engineers, 2002, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2002, 357 - 358, Japanese

  • SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKAZAKI Syunsuke
    When a piezoelectric film is glued on the surface of a cracked structure subjected to load, change in distribution of electric potential is observed on the surface of piezoelectric film. Based on this phenomenon, the passive electric potential CT (computed tomography) method was developed for identifying two- and three-dimensional cracks. In this study, this method was applied to identify experimentally a three-dimensional crack opening on the back surface. Electric potential distribution on the piezoelectric film mounted on the front surface was measured by non-contact voltmeter. Measured electric potential distribution agreed well with that calculated by the FEM. The inverse method based on the least residual method was applied for estimating the location and size of crack from the measured electric potential distribution. It was shown that the passive electric potential CT method using piezoelectric film was useful for quantitative identification of back-surface three-dimensional crack.
    The Japan Society of Mechanical Engineers, 2002, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2002, 497 - 498, Japanese

  • SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    Piezoelectric film is a sensing element that generates an electrical charge proportional to a change in mechanical stress. When the piezoelectric film is glued to the surface of a cracked material subjected to varying load, periodic change in distribution of electric potential is observed on the surface of piezoelectric film. Based on this phenomenon, the passive electric potential CT (computed tomography) method was developed for identifying two- and three-dimensional cracks. In the previous study, contact measurement method using electrodes and voltmeter was applied. In the present study, electric potential distribution is measured by non-contact voltmeter, which may be suitable for multi-point measurement, to develop non-contact electric potential CT measurement. It was found that the non-contact electric potential CT measurement had improved resolution and accuracy in crack identification.
    The Japan Society of Mechanical Engineers, 2001, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2001, 177 - 178, Japanese

  • SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKUNO Kousuke
    The Japan Society of Mechanical Engineers, 2000, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2000, 315 - 316, Japanese

■ MISC
  • Thermoelastic Temperature Analysis of Fatigue Crack Initiation Process in Polycarbonate
    辰巳大騎, 塩澤大輝, 小川裕樹, 阪上隆英
    Nov. 2023, 高温強度シンポジウム前刷集, 61st

  • In-Situ Evaluation of Damage in Tension for Austenitic Stainless Steel with a Bimodal Harmonic Structure by Diffraction Contrast Tomography and μCT Imaging Using Ultrabright Synchrotron Radiation
    中井善一, 塩澤大輝, 中澤一成, 川畑美絵, 菊池将一, 長谷卓海, 藤田佳祐, 飴山惠
    2023, X線材料強度に関するシンポジウム講演論文集, 57th

  • Accuracy Improvement of Building Tile Wall Diagnosis Using an Infrared Camera with Sensitivity in the 5-8μm Wavelength Range
    阪上隆英, 佐藤大輔, 塩澤大輝, 小川裕樹
    2023, 非破壊検査, 72(11) (11)

  • 鋼構造-THE NEXT STAGE 次世代への動き その3 維持管理・更新・改築 赤外線計測に基づく長大鋼橋梁の非破壊評価技術
    阪上隆英, 塩澤大輝, 小川裕樹, 横井芳輝, 杉山剛史, 溝上善昭
    2023, JSSC (Japanese Society of Steel Construction), (55) (55)

  • Application of lock-in processing for hyperspectral infrared data for accuracy improvement of deterioration detection in heavy duty anticorrosion coatings
    阪上隆英, 小川裕樹, 杉山剛史, 塩澤大輝, 坂田巧, 森本龍人, 春名進佑, 横井芳輝, 平松直人
    2023, 土木学会全国大会年次学術講演会(Web), 78th

  • Evaluation of Fatigue Strength for Laser Welded Joint with High Strength Steel Based on Dissipated Energy
    樋口花摘, 山本拓実, 小川裕樹, 林美佑, 門井浩太, 塩澤大輝, 阪上隆英
    2023, 高温強度シンポジウム前刷集, 61st

  • Evaluation of Stress Intensity Factor for Cracks under Anticorrosion Coatings Using Thermoelastic Stress Measurement, Japan
    井上諒, 松岡弘樹, 堀充弘, 塩澤大輝, 小川裕樹, 阪上隆英
    2023, 高温強度シンポジウム前刷集, 61st

  • Background Reflection Removal Using V-SLAM or SfM in the Infrared Measurement of Building Outer Wall Planes
    内田勇治, 横田太, 出崎翔大, 塩澤大輝, 阪上隆英
    日本非破壊検査協会, Sep. 2022, 非破壊検査, 71(9) (9), 422 - 428, Japanese

  • ドローン搭載外壁調査用赤外線サーモグラフィの開発と実証実験—特集 建築分野におけるドローン及び赤外線装置の活用(その1)
    塩澤 大輝, 阪上 隆英, 宇田 康, 佐藤 大輔
    日本建築防災協会, Jul. 2022, 建築防災, (534) (534), 23 - 27, Japanese

  • Evaluation of fatigue strength of SCM435 based on dissipated energy measurement
    杉本太唯地, 上地完世, 塩澤大輝, 阪上隆英, 小川裕樹, 上田秀樹, 牧野泰三
    2022, 日本材料学会学術講演会講演論文集(CD-ROM), 71st

  • Evaluation of fatigue strength of SCM435 based on dissipated energy measurement
    杉本太唯地, 上地完世, 塩澤大輝, 阪上隆英, 小川裕樹, 上田秀樹, 牧野泰三
    2022, 疲労シンポジウム講演論文集, 35th

  • Fatigue Strength Evaluation for Aluminum FSW Joints Based on Dissipated Energy
    立林寛也, 岩谷直樹, 小川裕樹, 塩澤大輝, 阪上隆英, 行武栄太郎
    2022, 疲労シンポジウム講演論文集, 35th

  • Background reflection removal using V-SLAM in infrared measurement of building outer wall
    塩澤大輝, 出崎翔大, 小川裕樹, 阪上隆英, 内田勇治, 横田太
    2022, 日本非破壊検査協会秋季講演大会講演概要集, 2022

  • SAKAGAMI Takahide, SHIOZAWA Daiki, OGAWA Yuki, TAKEUCHI Kenta, ITO Kunpei, ITO Kai, OISO Shoma, MITSUI Yujiro, KOIKE Masatoshi, IIZUKA Takashi
    Currently, the automobile industry is promoting weight reduction of car bodies by using high-strength thin steel sheets to improve fuel efficiency. On the other hand, since the rigidity of high-strength steel sheets alone is reduced, the weld bond method is attracting attention as a way to compensate for this. The weld bond method is a joining method that uses both adhesives and spot welding to improve the rigidity of steel plates while keeping them lightweight. The weld bond method can improve the rigidity only when the adhesive is applied to the required area. In this study, a new non-destructive inspection method using infrared thermography is developed as a high efficiency and high quality inspection method. The adhesive section is detected by measuring the difference in temperature fluctuation between the adhesive and non-adhesive section that occurs after heating the inspection target. However, the adhesive cannot be detected clearly with the time-series infrared data measured by temperature fluctuation. To solve this problem, we proposed PCA processing for time-series infrared data. The PCA process extracts each of the feature values present in the data as independent variables, and the changes in the feature values can be confirmed by images. It was found that the adhesive section, which cannot be confirmed by the infrared temperature image, can be clearly detected by the PCA processing.
    The Japan Society of Mechanical Engineers, 2022, The Proceedings of Mechanical Engineering Congress, Japan, 2022, J043-11, Japanese

  • SAKATA Takumi, MORIMOTO Tatsuhito, OGAWA Yuki, SAKAGAMI Takahide, SHIOZAWA Daiki, ARIMA Noriyasu, UCHINO Ryutaro, NISHITANI Masahiro
    Application of heavy-duty anticorrosion coating is a typical method to prevent corrosion in steel bridges. It is required to repaint before coating deterioration becomes prominent because the anticorrosive performance of the coating decreases over a long term. Thus, it is important to develop a remote and nondestructive inspection method for the deterioration of coating of entire bridges at an early stage. This study proposed a new inspection method for the deterioration of the top coat of the heavy-duty anticorrosion coating by short-wave (SW) infrared spectral characteristics on the absorption and reflection. The remaining thickness of the coatings can be quantitatively evaluated by measuring the infrared reflected energy from the top coat because the absorption of the coating depends on the thickness. We measured the infrared reflected energy from the specimen consisting of various thicknesses of the top coat. Moreover, the infrared reflected energy for the in-service bridge cannot be ignored the effect of the reflections from the sea surface and the shadows of bridge members. Thus, we developed the measurement method independent of the lighting condition that combines the active infrared measurement with a halogen lamp and the lock-in processing that can extract only the fluctuating component of infrared intensity, thereby reducing the influence of disturbances. It was found that the remaining thickness of the top coat for the actual bridge in-service can be quantitatively evaluated based on active lock-in infrared measurement even in the artificially reproduced disturbance condition.
    The Japan Society of Mechanical Engineers, 2022, The Proceedings of the Materials and Mechanics Conference, 2022, OS0125, Japanese

  • OYAGI Tomohiro, YASUI Yoshiki, KAWANO Hiroki, SHIOZAWA Daiki, OGAWA Yuki, SAKAGAMI Takahide, KURIHARA Tomoyuki, HAGA Hiroyuki
    In this study, basic research was conducted on a new lubricant analysis technique to constantly monitor the deterioration state of rotating equipment and other components in plant facilities. The research method used terahertz electromagnetic waves, which are electromagnetic waves in the frequency range of 0.1 to 10 THz, the boundary region between light and radio waves. As a measurement method, we focused on the fact that terahertz electromagnetic waves are safe for the human body yet have excellent transmittance, and conducted experiments using terahertz time-domain spectroscopy (THz-TDS). In this study, THz-TDS measurements were performed on artificially degraded lubricating oil to verify the possibility of detecting degradation factors and separately identifying each degradation factor. As a result, it was possible to detect water and iron powder and to identify them separately using the transmittance of THz electromagnetic waves obtained from the obtained time waveforms and the standard deviation ratio of the peak intensity values of THz waveforms. In addition, the detection and separation of iron powder, water, and antioxidants were possible using the attenuation of terahertz electromagnetic waves obtained from the frequency waveforms obtained by Fourier transforming the time waveforms. These results suggest that terahertz electromagnetic waves can be used to detect iron powder, water, and antioxidants, which are factors involved in lubricant degradation, and that each degradation factor can be separated and identified by using terahertz electromagnetic waves.
    The Japan Society of Mechanical Engineers, 2022, The Proceedings of the Materials and Mechanics Conference, 2022, OS0130, Japanese

  • NAGASAKI Sera, WANG Jeongwoon, AOKI Takuma, SHIOZAWA Daiki, OGAWA Yuki, KUBO Shiro, SAKAGAMI Takahide
    In recent years, there has been a concern about the occurrence of gas leakage and fire accidents in plant facilities due to damage caused by aging deterioration of gas piping. However, conventional gas leakage source estimation methods require prior teacher data or calculated data of gas clouds to be compared, which requires large computation time and may not be applicable under unexpected circumstances. Therefore, this study proposes a method to estimate the source of gas leakage by visualizing the leaking gas cloud using an infrared camera and performing an inverse problem analysis based on the concentration information without the need for prior teacher data or calculation data. It is found that the leakage source can be estimated by retrospective search from the gas concentration distribution to the location where the infrared absorption is large. In addition, the leak source estimation is achieved with high accuracy by removing the initial search position data and using only the position data near the leak source in the retrospective search.
    The Japan Society of Mechanical Engineers, 2022, The Proceedings of the Materials and Mechanics Conference, 2022, OS0128, Japanese

  • YAMAMOTO Takumi, HORITA Taiju, OGAWA Yuki, KADOI Kota, SHIOZAWA Daiki, SAKAGAMI Takahide
    In recent years, the development of car body structures using lightweight materials such as an aluminum alloy has progressed by taking into consideration environmental issues. Laser welding of aluminum alloys has been widely applied due to the commercialization of high-power fiber lasers. The application of welding techniques in actual structures requires a high level of safety and reliability. Thus, it is necessary to evaluate the fatigue fracture behaviors of the welds, which account for the majority of fractures. This study focused on the fatigue limit estimation method based on dissipated energy. The dissipated energy is a small heat generation caused by local plastic deformation. In recent years, the estimation method of fatigue limit by the dissipated energy is being considered for application in the industrial fields through the development of infrared sensors of high sensitivity and lock-in processing. This paper discussed the applicability of the estimation methods of the fatigue limit for the laser welds of aluminum alloys based on the dissipated energy measured using infrared thermography. The laser welds of aluminum alloys were fractured at the boundary between the weld metal and heat-affected zone. The fatigue limit of the laser welds was lower than that of the base metal specimen. In the measurement results of dissipated energy, the estimated fatigue limits of the laser welds and the base metal specimens were consistent with the fatigue limit by the fatigue tests. Thus, the fatigue limit of laser welds of aluminum alloys could be estimated by the dissipated energy.
    The Japan Society of Mechanical Engineers, 2022, The Proceedings of the Materials and Mechanics Conference, 2022, OS0326, Japanese

  • Evaluation of Crack Growth Behavior Based on Dissipated Energy
    齋藤健次朗, 山本大貴, 塩澤大輝, 小川裕樹, 阪上隆英, 久保司郎
    2021, 破壊力学シンポジウム講演論文集, 20th

  • Development of wide area gas leak sensing system based on infrared measurement
    都築 斉一, 塩澤 大輝, 森本 隆史, 阪上 隆英
    システム制御情報学会, 22 May 2019, システム制御情報学会研究発表講演会講演論文集, 63, 531 - 533, Japanese

  • Detection of Fatigue Cracks in Steel Bridges Using Infrared Thermography
    阪上 隆英, 溝上 善昭, 塩澤 大輝, 和泉 遊以
    日本光学会, Aug. 2017, 光学 = Japanese journal of optics : publication of the Optical Society of Japan, 46(8) (8), 312 - 317, Japanese

  • 101 Thermoelastic Stress Measurement using Infrared Thermography : The Target of Stress Evaluation for Small Parts
    AKAI Atsushi, YAMADA Taiki, OKUNO Kouta, SHIOZAWA Daiki, SAKAGAMI Takahide
    Downsizing and cost reduction have been demanded to mechanical components. Simultaneously, material reliability for these components is also necessary. Thus corresponding evaluation techniques for these tasks are considerably required. For this reason, authors focused on a technique using infrared thermography, because it could evaluate not only stress concentration fields, but also fatigue crack initiation points owing to two-dimensional image. In this study, thermoelastic stress for the small size specimen was measured using infrared thermography with microscopic lens; hence the particular problems using microscopic lens were extracted and improved.
    The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 1 - 4, Japanese

  • 103 Rapid Estimation of Fatigue Strength and Crack Initiation Point Based on Dissipated Energy Measurement
    SHIOZAWA Daiki, SAKAGAMI Takahide
    The evaluation of fatigue limit is important in designing products. In this study, the applicability of the fatigue limit estimation based on dissipated energy was investigated. The fatigue limit estimation and fatigue tests were carried out for the same specimen having multiple notches, and differences of dissipated energy in each notch and the crack initiated location were observed. It was found that the notch, where the biggest dissipated energy was observed, coincided with the crack initiated notch. Next, the fatigue limit estimation method was applied to the evaluation of pre-strained materials, and accuracy improvement of fatigue limit estimation was discussed. The fatigue limit can be estimated by increase rate of dissipated energy against stress level.
    The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 7 - 10, Japanese

  • M316 Fatigue damage evaluation based on the infrared measurement for polymer composite materials
    TAMASHIRO Takato, NAKAMURA Yu, SHIOZAWA Daiki, SAKAGAMI Takahide, SAWADA Hidetsugu, NONAKA Shinichi, HAMADA Kenichi
    The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 268 - 268, Japanese

  • M314 Stress and Dissipated Energy Measurement using Infrared Camera with Microscopic Lens for Austenitic Stainless Steel
    YAMADA Taiki, OKUNO Sota, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 266 - 266, Japanese

  • M321 Soundness evaluation of steel plate under coating with THz-TDS
    TAMAKI Yoshitaka, IWAMA Tatsuya, SAKAGAMI Takahide, SHIOZAWA Daiki, SEKINE Kazuki, SHIOMI Kouya
    The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 273 - 273, Japanese

  • M204 Estimation of stress distribution under paint coating by inverse analysis
    IINO Keito, SAKAGAMI Takahide, SHIOZAWA Daiki
    The Japan Society of Mechanical Engineers, 11 Mar. 2016, 関西支部講演会講演論文集, 2016(91) (91), 242 - 242, Japanese

  • OS0408-335 Fundamental study on defect imaging using terahertz electromagnetic wave
    IWAMA Tatsuya, TAMAKI Yoshitaka, SHIOZAWA Daiki, SAKAGAMI Takahide
    THz electromagnetic wave has been receiving increasing attention in many engineering applications because of the following characteristics. THz wave transmits many kinds of materials except for metals and water. Materials have their own fingerprint absorption spectrum. THz wave is safe for human body. Especially the transmission property of THz wave enables us to develop nondestructive inspection technique for engineering plastics. In this study, fundamental study on defect imaging for Nylon resin sample with various shaped defects was conducted. Terahertz time-domain spectroscopy (THz-TDS) system was employed for the THz scanning imaging.
    The Japan Society of Mechanical Engineers, 21 Nov. 2015, M&M材料力学カンファレンス, 2015, "OS0408 - 335-1"-"OS0408-335-3", Japanese

  • OS0403-415 Dissipated energy measurement for AZ31B magnesium alloy
    FUNAZO Shunsuke, YAMASHIRO Kenji, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    The fatigue limit of metal is dicided by 10^7 cycles fatigue test, and it takes long time and costs. Recently, fatigue limit estimation based on energy dissipation has been attracting. In this method, temperture change due to irreversible energy dissipation is measured by the infrared thermography for various levels of stress amplitude. In this study, this method was applied to extruded AZ31B magnesium alloy. It was found that harmonic vibration stress from fatigue testing machine affects the measurement of dissipated energy. This effect can be suppressed by adjustment of fatigue testing machine. New estimation scheme which is based on the incresing rate of dissipated energy was applied. The estimated fatigue limit obtained by the new estimation scheme coinceies with the compressive yield stress.
    The Japan Society of Mechanical Engineers, 21 Nov. 2015, M&M材料力学カンファレンス, 2015, "OS0403 - 415-1"-"OS0403-415-3", Japanese

  • OS0804-301 Observation of Crack Initiation and Propagation under Rolling Contact Fatigue using Synchrotron Radiation Laminography
    OBAMA Tomoya, SHIOZAWA Daiki, KIKUCHI Shoichi, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    In rolling contact fatigue (RCF), cracks initiate and propagate from inclusions beneath the surface. In the present study, crack propagation behavior under RCF was observed by synchrotron radiation computed laminography (SRCL), which is suitable for thin plates, in SPring-8 (Super Photon Ring-8 GeV). Specially fabricated inclusion-rich steel (modified JIS SUJ2) plate specimen, which includes extended inclusions distributed in depth direction, was employed in the experiments. Specimen with surface crack from inclusion and after the occurrence of flaking was observed by SRCL, and flaking defect and crack under the surface was successfully detected. It was found that the tensile-type vertical crack, which was perpendicular to the rolling contact surface, was formed from a cylindrical inclusion. After the vertical crack propagated along inclusion, the shear-type horizontal crack, which was parallel to the rolling contact surface, was found to initiate and then flaking occurred as the result of the propagation of the shear-type crack. It is considered that the vertical crack is an important factor of flaking process and crack propagation behavior under RCF from inclusions is clarified by SRCL.
    The Japan Society of Mechanical Engineers, 21 Nov. 2015, M&M材料力学カンファレンス, 2015, "OS0804 - 301-1"-"OS0804-301-2", Japanese

  • GS0205-423 Evaluation of Misorientation in Fatigue of Stainless Steel Using Ultra-bright Synchrotron Radiation
    NAKAO Ryota, ASAKAWA Naoya, MATSUDA Shota, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAI Yoshikazu
    A three dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8 (Super Photon ring-8 GeV), which is the brightest synchrotron radiation facility in Japan. To evaluate the fatigue damage of grains, total misorientation, β for each grain was calculated from DCT measurement. It is found that value of β increases with number of cycles, and change of β for primary slip plane is the largest in diffraction planes. In addition, the largest change of β, was observed in the diffraction plane with the largest Schmid factor, F_s in equivalent primary slip planes. From this results, it is found that change of β reflects slip behavior in a grain, because change of β correspond to Schmid factor in fcc materials which can be determined the primary slip direction.
    The Japan Society of Mechanical Engineers, 21 Nov. 2015, M&M材料力学カンファレンス, 2015, "GS0205 - 423-1"-"GS0205-423-3", Japanese

  • OS8-2 Fatigue Limit Estimation Based on Dissipated Energy for Pre-Strained Materials(Fatigue monitoring,OS8 Fatigue and fracture mechanics,STRENGTH OF MATERIALS)
    Shiozawa Daiki, Inagawa Tsuyoshi, Washio Takaya, Sakagami Takahide
    The Japan Society of Mechanical Engineers, 04 Oct. 2015, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2015(14) (14), 112 - 112, English

  • OS8-3 Evaluation of High Cycle Fatigue Damage for Austenitic Stainless Steel by Diffraction Contrast Tomography Using Ultra-bright Synchrotron Radiation(Fatigue monitoring,OS8 Fatigue and fracture mechanics,STRENGTH OF MATERIALS)
    Asakawa Naoya, Shiozawa Daiki, Kikuchi Shoichi, Matsuda Shota, Nakao Ryota, Nakai Yoshikazu
    The Japan Society of Mechanical Engineers, 04 Oct. 2015, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2015(14) (14), 113 - 113, English

  • OS4-13 Observation of Internal Small Fatigue Cracks in Ti-6Al-4V by Using Synchrotron Radiation Micro-computed Tomography Imaging at SPring-8(3D/4D image-based analyses and simulations 4,OS4 3D/4D image-based analyses and simulations,MEASUREMENT METHODS)
    Yoshinaka Fumiyoshi, Nakamura Takashi, Shiozawa Daiki, Nakai Yoshikazu, Uesugi Kentaro
    The Japan Society of Mechanical Engineers, 04 Oct. 2015, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2015(14) (14), 55 - 55, English

  • OS4-12 4D Observation of Crack Propagation Behavior under Rolling Contact Fatigue by Synchrotron Radiation Laminography(3D/4D image-based analyses and simulations 4,OS4 3D/4D image-based analyses and simulations,MEASUREMENT METHODS)
    Obama Tomoya, Shiozawa Daiki, Kikuchi Shoichi, Neishi Yutaka, Makino Taizo, Nakai Yoshikazu
    The Japan Society of Mechanical Engineers, 04 Oct. 2015, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2015(14) (14), 54 - 54, English

  • 301 Study on estimation mechanism of fatigue limit estimation based on dissipated energy
    SHIOZAWA Daiki, AKAI Atsushi, INAGAWA Tsuyoshi, YAMASHIRO Kenji, SAKAGAMI Takahide
    Fatigue limit estimation based on the dissipated energy measurement using infrared thermography has been getting an increasing attention in various industries. In this study, mechanism of energy dissipation is investigated in relation with formulation of slip bands for JIS type 316L stainless steel through observation of slip bands by optical microscope and atomic force microscope. It was found that the energy dissipation was related to activity of slip band and estimated fatigue limit is corresponding to crack initiation stress level of the material. Phase information of energy dissipation was investigated and was applied to the accuracy improvement of dissipated energy measurement for fatigue damage estimation.
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 59 - 62, Japanese

  • 311 Nondestructive evaluation of fatigue cracks based on infrared temperature measurement
    SAKAGAMI Takahide, SHIOZAWA Daiki, IZUMI Yui
    There is an urgent need for developing high-performance nondestructive evaluation (NDE) methods to assist in effective maintenance of aging infrastructures. Recently, use of infrared cameras in nondestructive testing has been attracting increasing interest, as they provide highly efficient remote and wide area measurements. This paper presents remote NDE techniques using infrared thermography developed by the authors for fatigue crack detection and structural integrity assessments.
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 90 - 93, Japanese

  • M203 Fatigue limit estimation based on dissipated energy measurement for cavitation shot less peened type 316L stainless steel
    INAGAWA Tsuyoshi, WASHIO Takaya, SHIOZAWA Daiki, SAKAGAMI Takahide, SOYAMA Hitoshi
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 277 - 277, Japanese

  • M205 Verification of Suppressing Effect on Crack Propagation based on Thermoelastic Stress Measurement by Infrared Thermography
    KANDA Takuro, ISHIKAWA Toshiyuki, ENDO Hideki, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 279 - 279, Japanese

  • M207 Fatigue limit estimation based on dissipated energy measurement for magnesium alloy type AZ31B
    YAMASHIRO Kenji, FUNAZO Shunsuke, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 281 - 281, Japanese

  • 310 Observation of Change of Dislocation Structure in Fatigue by Diffraction Contrast Imaging using Ultra-bright Synchrotron Radiation
    NAKAI Yoshikazu, MATSUDA Shota, NAKAO Ryota, ASAKAWA Naoya, KIKUCHI Shoichi
    The three dimensional grain mapping technique for polycrystalline material, called X-ray diffraction contrast tomography (DCT), was conducted in SPring-8 (Super Photon ring-8 GeV), which is the brightest synchrotron radiation facility in Japan, and the conditions of measurement and data processing procedure have been obtained. Developed technique was applied to a commercially pure iron, and an austenitic stainless steel. The shape and location of grain could be determined by DCT using the apparatus in a beam line of SPring-8. Total misorientation of an individual crystalographic plane of a specific grain during fatigue test of the steels were measured. In fatigue test of the stainless steel, thetotal misorientastion of {111} planes increased with number of cyccles. Among {111} planes, the amount of change depended on Schmid factor, i.e., the change was higher for planes with larger Schmid factor. For the commercially pure iron, the total misorientastion of {110} planes increased with number of cyccles. The amount of change, however, did not depend on Schmid factor because of pencile-glide. The effect of cross-slip should be considered
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 86 - 89, Japanese

  • 309 4D Observation of Rolling Contact Fatigue Crack Growth by Synchrotron radiation Laminography
    SHIOZAWA Daiki, SATO Kazuya, Obama Tomoya, KIKUCHI Shoichi, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    In rolling contact fatigue(RCF), cracks are usually initiated from inclusions under the surface and propagated to the contact surface. In the present study, RCF cracks was observed using synchrotron radiation computed laminography(SRCL) in SPring-8. The specimen with flaking damage was measured by SRCL. It was found that two types of cracks, vertical crack and horizontal crack under the contact surface, which is typically rolling fatigue crack, was measured by SRCL. The ex-situ fatigue tests and SRCL observation was conducted in SPring-8. It was found that the horizontal crack initiated after the vertical crack initiated and propagated along inclusion. It is considered that the vertical crack is an important factor of flaking process, and the shape and length of inclusion affect the initiation and propagation of vertical crack.
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 82 - 85, Japanese

  • M813 Integrity Evaluation of Steel Bridge Based on Thermoelastic Stress Measurement
    OTANI Naoya, KOBAYASHI Yoshihiro, MIZOKAMI Yoshiaki, IZUMI Yui, FUJIMOTO Taisei, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 377 - 377, Japanese

  • M815 Nondestructive Evaluation of Latent Degradation in Corrosion Protection Coating by Pulse-heating Infrared Thermography
    ITO Hiroki, KOUTA Yoshio, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 379 - 379, Japanese

  • Measurement of thermoelastic stress distribution under coating by inverse problem analysis
    IINO Keito, SAKAGAMI Takahide, SHIOZAWA Daiki
    赤外線サーモグラフィを用いた熱弾性応力測定法によって鋼構造物の作用応力を計測する際,塗膜外面温度変動から鋼材表面の温度変動を逆解析的に推定することで塗膜を除去せずにき裂周辺の応力評価を行うことを検討した.
    The Japan Society of Mechanical Engineers, 22 Nov. 2014, The Computational Mechanics Conference, 2014(27) (27), 277 - 278, Japanese

  • OS2128 Relationship between dissipated energy and deformation mechanisms of AZ31B expanded-magnesium alloy
    YAMADA Taiki, YAMASHIRO Kenji, SHIOZAWA Daiki, SAKAGAMI Takahide
    In recent years, fatigue limit estimation based on energy dissipation has been attracting considerable attention. In this method, temperature change due to irreversible energy dissipation is measured by infrared thermography in various levels of stress amplitude, under cyclic loading. It is experimentally observed that dissipated energy increases with increasing stress levels, and that there is a certain stress level where the dissipated energy undergoes a sharp increase, which has been proven to coincide with the fatigue limit in certain BCC and FCC metals. In this study, this method was applied to an HCP metal, AZ31B magnesium alloy. Fatigue limit estimation based on dissipated energy and conventional fatigue test are conducted on two types of AZ31B magnesium alloy; rolled and extruded material. The estimated fatigue limit obtained for rolled AZ31B agrees well with results from conventional fatigue tests, with fatigue strength at N=10^7. The dissipated energy showed the two characterisitic changes for the plastic strain energy. It was considered that these changes imply twinning and slip deformation restated to fatigue damage, respectively.
    The Japan Society of Mechanical Engineers, 19 Jul. 2014, M&M材料力学カンファレンス, 2014, "OS2128 - 1"-"OS2128-3", Japanese

  • OS2125 Measurement of dissipated energy for short glass fiber reinforced plastics
    TAMASHIRO Takato, INAGAWA Tsuyoshi, SHIOZAWA Daiki, SAKAGAMI Takahide, SAWADA Hidetsugu, KANEMOTO Michinari, ARAKI Daisuke
    Recently, fatigue limit estimation based on the dissipated energy measurement using infrared thermography has attracted attention in various industries. In this study, dissipated energy measurement was applied to the evaluation of fatigue properties for composite material. The short glass fiber reinforced plastics, which is called BMC (Bulk Molding Compound) was used. In a staircase-like stress level test, dissipated energy increased with increase of stress level and there was a liner relationship between dissipated energy and energy loss caused by viscoelastic deformation. In constant stress level fatigue test, dissipated energy and thermoelastic temperature change showed the constant value in initial period of fatigue test, and then slightly decreased. On the other hand, energy loss increased with increase of loading cycles. It was considered that this deference between the change of dissipated energy and energy loss were due to the initiation of crack and fiber/matrix delamination. Therefore it was found that dissipated energy for BMC could evaluate plastic deformation of matrix and the condition of fiber/matrix interface.
    The Japan Society of Mechanical Engineers, 19 Jul. 2014, M&M材料力学カンファレンス, 2014, "OS2125 - 1"-"OS2125-3", Japanese

  • OS2124 Improvement of accuracy of fatigue damage evaluation using phase analysis of energy dissipation
    INAGAWA Tsuyoshi, SHIOZAWA Daiki, SAKAGAMI Takahide
    Fatigue limit estimation based on the dissipated energy measurement using infrared thermography has been getting an increasing attention in various industries. Most of the studies on dissipated energy have been discussed based on the mean temperature rise or irreversible component of heat generation due to energy dissipation. In this study, phase information of energy dissipation was investigated and was applied to the accuracy improvement of dissipated energy measurement for fatigue damage estimation. The material under test is JIS type 316L austenitic stainless steel. The stress ratio R was set to be -1, -0.8 and -0.5. It is found that the phase difference takes certain constant value during significant energy dissipation and unique value corresponding to the stress ratio. It is concluded that band pass phase filtering is effective to the improvement of the measurement of dissipated energy.
    The Japan Society of Mechanical Engineers, 19 Jul. 2014, M&M材料力学カンファレンス, 2014, "OS2124 - 1"-"OS2124-3", Japanese

  • OS2121 Observation rolling contact fatigue crack in high-strength steel using Synchrotron Radiation Laminography
    OBAMA Tomoya, SHIOZAWA Daiki, SATO Kazuya, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    In rolling contact fatigue (RCF), cracks are usually initiated from inclusions under the surface and propagated to the contact surface. In the present study, RCF cracks was observed using synchrotron radiation computed laminography (SRCL) in SPring-8. For observation of crack propagation, ex situ rolling fatigue test and SRCL were applied to same sample. Laminography is suitable for the observation of sheeted material and sheeted sample is useful for operation of rolling fatigue tests. The specimen with flaking damage was measured by SRCL. It was found that two types of cracks, vertical crack and horizontal crack under the contact surface, which is typically rolling fatigue crack, can be measured by SRCL. For observation of RCF crack propagation, vertical crack which initiate from inclusion and propagated in the direction perpendicular to the contact surface, could be detected. SRCL and fatigue tests were conducted three times. As results, crack propagation could be observed between first and third measurements, while the different part of crack was detected in second measurement. Residual compression stress is considered to affect the observation of RCF crack. SRCL is concluded to be effective for evaluation of initiation and propagation behavior of crack in the rolling fatigue.
    The Japan Society of Mechanical Engineers, 19 Jul. 2014, M&M材料力学カンファレンス, 2014, "OS2121 - 1"-"OS2121-3", Japanese

  • 315 Fatigue limit evaluation based on dissipated energy measurement for expanded-magnesium alloy type AZ31B
    YAMASHIRO Kenji, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "3 - 24", Japanese

  • 1118 Study of Contactual Sensing Using Piezoelectric Sensor Sheet and Inverse Analysis
    岡田 好史, 塩澤 大輝, 中井 善一
    The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "11 - 18", Japanese

  • 1125 Detection of Deep Lying Defects by Eddy Current Testing System with a High Sensitivity Magnetic Sensor
    志田 貴文, 塩澤 大輝, 中井 善一
    The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "11 - 24", Japanese

  • 1126 Fracture Mechanics Parameter Evaluation Based on Thermoelastic Stress Distribution Measurement
    YASUMURA Koki, IZUMI Yui, SHIOZAWA Daiki, SAKAGAMI Takahide
    The Japan Society of Mechanical Engineers, 18 Mar. 2014, 関西支部講演会講演論文集, 2014(89) (89), "11 - 25", Japanese

  • OS1504 Observation of Crack Propagation Process under Rolling Contact Fatigue by using Synchrotron Radiation μCT and Compact Rolling Contact Fatigue Testing Machine
    SATO Kazuya, SHIOZAWA Daiki, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu, OKADA Souta
    In rolling contact fatigue (RCF), cracks are usually initiated from inclusions under the surface and propagated to the surface. In the present study, the micro computed tomography (μCT) imaging and laminography using synchrotron radiation in SPring-8 is applied for observation of RCF cracks. The compact RCF testing machine is developed to observe RCF crack behavior m-situ. In this testing machine, the steel ball rolls on the specimen, linearly and reciprocally, and a specimen can be attached and removed easily. Since the size of the sample for μCT imaging has to be limited by penetrative power, the sample for μCT imaging has 500μm×500μm cross-section. On the other hand, laminography can be applied to a sheeted material. The sample, where an artificial defect is introduced, is used for observation of crack initiation and propagation. It is found from this experiment that cracks initiate and propagate in the depth direction along the artificial hole with increasing the number of cycles. Flaking and RCF crack in sheeted sample are observed by laminography. RCF cracks which initiate and propagate under contact surface can be detected. The shape and location observed by laminography coincide with that by SEM.
    The Japan Society of Mechanical Engineers, 12 Oct. 2013, M&M材料力学カンファレンス, 2013, "OS1504 - 1"-"OS1504-3", Japanese

  • OS1524 Fatigue Strength of Ultra Fine Grain a-Brass
    NAKAI Yoshikazu, IMANAKA Takuto, SHIOZAWA Daiki
    Tensile tests and fatigue tests were conducted with a α-brass ultra-fine grains (UFG) from 1 to 5μm diameter produced either by severe plastic deformation through equal angular pressing (ECAP) or multiple rolling, where the minimum grain size obtained by ECAP was 4.9 μm, and 1.0 μm by the multiple rolling. The proof stress, tensile strength and fatigue limit were increased with decreasing grain size, and Hall-Petch relationships were established. The relationship, however, depended on the thickness of specimen, i.e., those were lower for thin plate. The proof stress increased by ten-fold by the grain refinement, while the tensile strength increased by two-fold. The fatigue strength also increased; however, the effect was not as much as the static strengths.
    The Japan Society of Mechanical Engineers, 12 Oct. 2013, M&M材料力学カンファレンス, 2013, "OS1524 - 1"-"OS1524-2", Japanese

  • OS1309 Fatigue limit estimation based on dissipated energy for expanded-magnesium alloy
    SHIOZAWA Daiki, YAMASHIRO Kenji, INAGAWA Tsuyoshi, OKAE Hideki, SAKAGAMI Takahide, NAKAI Yoshikazu
    In recent years, fatigue limit estimation based on dissipated energy measurement using infrared thermography has attracted attention in various industries. In this study, fatigue limit estimation based on dissipated energy measurement and conventional fatigue test were conducted the expanded-magnesium alloy type AZ31B. Fatigue limit estimated by dissipated energy measurement was around 95MP to lOOMPa. This value generally coincided with that obtained by conventional 10^7 cycles fatigue test. Relationship between plastic strain energy and dissipated energy was investigated to discuss microstructure transformation. It was found that dissipated energy does not vary linearly with the plastic strain energy. It was considered that energy dissipation for AZ31B is affected by the deformation twins.
    The Japan Society of Mechanical Engineers, 12 Oct. 2013, M&M材料力学カンファレンス, 2013, "OS1309 - 1"-"OS1309-3", Japanese

  • OS1503 Study on the Fatigue Damage Evaluation by Diffraction Contrast Tomography using High-intensity Radiation
    MATSUDA Shota, MASADA Naoya, SHIOZAWA Daiki, NAKAI Yoshikazu, MIURA Ryotaro
    X-ray diffraction contrast tomography (DCT) is a technique for three-dimensional grain mapping of polycrystalline material. Measurement of DCT has been conducted m SPring-8 and shape and location of grain can be determined by DCT technique using the apparatus in BL19B2. For evaluation of plastic deformation by DCT, tensile and cyclic loading was applied to the sample during the measurement of DCT. The diffraction spots belonging to certain grain appear over some continuous projection images. The rotation angle range where diffraction spot appear is defined as grain orientation spread, and the grain orientation spread was counted in tensile tests and fatigue test. In the tensile test, the grain orientation spread increases in the plastic deformation. In the fatigue test, grain orientation spread increases with increasing m the number of cycles. It is possible to evaluate fatigue damage by DCT technique and using the grain orientation spread.
    The Japan Society of Mechanical Engineers, 12 Oct. 2013, M&M材料力学カンファレンス, 2013, "OS1503 - 1"-"OS1503-3", Japanese

  • OS0611 Fatigue limit estimation based on dissipated energy for surface improved SUS 316L steel
    INAGAWA Tsuyoshi, AKAI Atsushi, INABA Ken, SHIOZAWA Daiki, SAKAGAMI Takahide
    Recently, fatigue limit estimation based on the dissipated energy measurement using infrared thermography has attracted attention in various industries. In this study, fatigue limit estimation based on dissipated energy measurement was applied to the evaluation of shot peening treatment. Shot peening treatment is used for fatigue limit improvement by applying work hardening layer and compressive residual stress. The strength of material is affected strongly by shot peening treatment condition. Therefore, it is useful to evaluate the effect of shot peening condition by fatigue limit estimation. The fatigue limit estimation by energy dissipation was applied to shot peened 316L stainless steel specimen. It is found that estimated fatigue limit of the shot peened material obtained by dissipated energy is conservative value compared with that obtained by conventional fatigue test. After the fatigue test, micro cracks were observed in the unbroken specimen of shot peened materials. Therefore, dissipated energy for shot peened materials subjected to the stress amplitude below fatigue limit was affected by non-propagation cracks. It was considered that the estimated fatigue limit indicated crack initiation stress level.
    The Japan Society of Mechanical Engineers, 12 Oct. 2013, M&M材料力学カンファレンス, 2013, "OS0611 - 1"-"OS0611-3", Japanese

  • 521 Development and Evaluation of Ultra-fine Grained Brass
    IMANAKA Takuto, TSUTSUMI Yuki, NAKAI Yoshikazu, SHIOZAWA Daiki
    The Japan Society of Mechanical Engineers, 16 Mar. 2013, 関西支部講演会講演論文集, 2013(88) (88), "5 - 21", Japanese

  • 429 Observation of Structure of Polycrystalline Metal using Three-dimensional Grain Mapping of Ultra-bright Synchrotron
    MIURA Ryotaro, MATSUDA Shota, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Mar. 2013, 関西支部講演会講演論文集, 2013(88) (88), "4 - 29", Japanese

  • 514 Simplified prediction method of fatigue limit in austenitic stainless steel
    Otobe Shogo, Shiozawa Daiki, Nakai Yoshikazu, Okae Hideki
    The Japan Society of Mechanical Engineers, 16 Mar. 2013, 関西支部講演会講演論文集, 2013(88) (88), "5 - 14", Japanese

  • 1022 Evaluation of Torsion Fatigue Crack Propagation by Finite Element Analysis based on Synchrotron Radiation μ-CT Imaging Model
    NOSHO Hiroaki, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Mar. 2013, 関西支部講演会講演論文集, 2013(88) (88), "10 - 5", Japanese

  • OS0723 Fatigue Limit Estimation based on Dissipated Energy Measurement for Steel Specimen with Multiple Notches
    INABA Ken, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    The evaluation of the fatigue limit is important in designing products. Fatigue limit estimation based on dissipated energy has been getting considerable attentions. In this method, temperature change due to irreversible energy dissipation is measured by infrared thermography for various levels of stress amplitude. It is known that the dissipated energy increases with increasing stress levels, and a certain stress level where the change in dissipated energy shows sharp increase coincides with fatigue limit. In this study, this technique was applied to the detection of crack initiation location. The fatigue limit estimation and fatigue tests were carried out for the specimen having multiple notches. It was found that the increasing rate of dissipated energy measured at the notch where crack was initiated was larger than that at other notches. Therefore, it was considered that the location of crack could be detected before crack initiation by using dissipated energy measurement.
    The Japan Society of Mechanical Engineers, 22 Sep. 2012, M&M材料力学カンファレンス, 2012, "OS0723 - 1"-"OS0723-3", Japanese

  • 822 Development of the Leakage and the Eddy Current Type Defective Detecting Method Using a High Sensitivity MI Sensor
    OGAWA Akira, SHIDA Takahumi, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Mar. 2012, 関西支部講演会講演論文集, 2012(87) (87), "8 - 22", Japanese

  • 826 Pressure Distribution Measurement Method with Inverse Problem Using Piezoelectric Sensor Sheet
    KURASHIKI Yoshihide, OKADA Yoshifumi, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Mar. 2012, 関西支部講演会講演論文集, 2012(87) (87), "8 - 26", Japanese

  • 821 Observation of Crack under Rolling Fatigue in High-strength Steels by using Synchrotron Radiation μCT
    FUKUDA Yoshiyuki, OKADA Sota, NEISHI Yutaka, MAKINO Taizo, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Mar. 2012, 関西支部講演会講演論文集, 2012(87) (87), "8 - 21", Japanese

  • 820 Technique for Three-dimensional Grain Mapping Using Diffraction Contrast Image Using High-intensity Radiation
    TSUTSUMI Kenta, NAKAI Yoshikazu, SHIOZAWA Daiki, MIURA Ryotaro, MASADA Naoya
    The Japan Society of Mechanical Engineers, 16 Mar. 2012, 関西支部講演会講演論文集, 2012(87) (87), "8 - 20", Japanese

  • 高強度鋼の転動疲労下のはく離損傷および内部き裂形態の観察
    牧野 泰三, 根石 豊, 中井 善一, 塩澤 大輝
    Feb. 2012, 平成23年度 SPring-8 重点産業利用課題成果報告書(2011A), pp.173-176, Japanese
    [Refereed]
    Others

  • 結晶3Dマッピング法を用いた塑性ひずみの測定
    中井 善一, 塩澤 大輝
    Feb. 2012, 平成23年度 SPring-8 重点産業利用課題成果報告書(2011A), pp.169-172, Japanese
    [Refereed]
    Others

  • 735 Development of Plastic Strain Evaluation Technique by Grain 3D Mapping Technique
    SHIOZAWA Daiki, MIURA Ryotaro, MASADA Naoya, NAKAI Yoshikazu
    日本材料学会, 2012, 学術講演会講演論文集, 61, 455 - 456, Japanese

  • 114 Fatigue Limit Estimation Based on Dissipated Energy Measurement For Austenitic Stainless Steel to the Influence of Martensite Phase Transformation
    AKAI Atsushi, INABA Ken, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会, 2012, 学術講演会講演論文集, 61, 27 - 28, Japanese

  • OS05-4-3 Observation of Delamination Defects and Cracks in High-strength Steels under Rolling Contact Fatigue by SR Micro CT Imaging
    Shiozawa Daiki, Neishi Yutaka, Fukuda Yoshiyuki, Makino Taizo, Nakai Yoshikazu
    The Japan Society of Mechanical Engineers, 19 Sep. 2011, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2011(10) (10), "OS05 - 4-3-1", English

  • OS05-1-2 Evaluation of Torsional Fatigue Crack Propagation by Shinchrotoron Radiation Micro-CT Imaging
    Shiozawa Daiki, Nakai Yoshikazu, Murakami Tomonobu, Nosho Hiroaki
    The Japan Society of Mechanical Engineers, 19 Sep. 2011, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2011(10) (10), "OS05 - 1-2-1", English

  • OS05-2-3 Development of Three-dimensional Grain Mapping Technique Using SPring-8
    Shiozawa Daiki, Tsutsumi Kenta, Nakai Yoshikazu, Kajiwara Kentaro
    The Japan Society of Mechanical Engineers, 19 Sep. 2011, Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2011(10) (10), "OS05 - 2-3-1", English

  • OS0315 Investigation of Appropriate Measurement Conditions for Fatigue Limit Estimation Based on Dissipated Energy for 304 Stainless Steel
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    In recent years, fatigue limit estimation method based on energy dissipation measured by infrared thermography is getting an increasing attention. In this method, temperature change due to irreversible energy dissipation during one loading cycle is measured for different levels of applied stress amplitude. Obtained relationship between temperature change and stress amplitude shows a significant inflection at certain stress level where temperature change due to energy dissipation shows steep increase. It is known that this stress level coincides with fatigue limit. In this study, measurement conditions for appropriate fatigue limit determination based on the energy dissipation are discussed in conjunction with (i) required number of loading cycles in each stress level, (ii) representative value in measurement area, and (iii) influence of loading history and fatigue damage accumulation.
    The Japan Society of Mechanical Engineers, 16 Jul. 2011, M&M材料力学カンファレンス, 2011, "OS0315 - 1"-"OS0315-3", Japanese

  • OS0509 Detection of Crack under Rolling Fatigue in High-strength Steels by using Synchrotron Radiation μCT
    FUKUDA Yoshiyuki, SHIOZAWA Daiki, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    In the present study, synchrotron radiation micro computed tomography (SR μCT) imaging of SPring-8 was applied to the observation of delamination defects in high-strength steels under rolling contact fatigue. The rolling contact fatigue crack initiation occurs under surface and these defects propagate to the surface. The conventional technique, such as optical microscope and scanning microscope, cannot give us the crack initiation and growth behavior under the surface. Therefore, the shape of rolling contact fatigue defects was observed by SR μCT imaging. The specimen with an artificial defect, which simulates an inclusion, was used to the contact rolling fatigue tests. The broken and non-broken specimens were observed respectively by SR μCT. The delamination defects and cracks can be detected from the artificial defetct. It is found from these results that the defect initiation and propagation behavior in the rolling contact fatigue process can be discussed from the measurements by SR μCT imaging. The number of crack, location and size of crack obtained by the CT imaging coincide with those by polishing and SEM measurements. It is found from these results that the defect initiation and propagation behavior in the rolling contact fatigue process can be discussed from the measurements by SR μCT imaging.
    The Japan Society of Mechanical Engineers, 16 Jul. 2011, M&M材料力学カンファレンス, 2011, "OS0509 - 1"-"OS0509-3", Japanese

  • OS0513 Fatigue damage evaluation by deformation-induced martensitic transformation in SUS304 steel
    Otobe Shogo, Nakai Yoshikazu, Shiozawa Daiki
    SUS304 steel is a kind of the austenitic stainless steel. It is used for various fields, example for the plant and the nuclear plant. The austenite phase is non-magnetism usually, but when SUS304 steel is received a big stress, a part of it is transformed into the martensitic phase that is ferromagnetism. In recently years, a lot of researches are done the nondestructive testing by measuring the magnetic characteri6stic using this character. It is hope that the method of detecting the damage before generation of the crack for to improve the safety of the machine and the structure. Then, we measured martensite fraction in the fatigue process of SUS304 steel, and we examined applicability from the change in martensite fraction to the fatigue damage evaluation in this study.
    The Japan Society of Mechanical Engineers, 16 Jul. 2011, M&M材料力学カンファレンス, 2011, "OS0513 - 1"-"OS0513-3", Japanese

  • 604 Investigation of Fatigue Damage Process Based on Dissipated Energy Measurement
    AKAI Atsushi, SAKAGAMI Takahide, SHIOZAWA Daiki
    The Japan Society of Mechanical Engineers, 19 Mar. 2011, 関西支部講演会講演論文集, 2011(86) (86), "6 - 4", Japanese

  • 608 Observation and evaluation of deformation-induced martensitic transformation behavior durig fatigue damageprocess in austenitic stainless steel
    MASAKA Takeshi, SHIOZAWA Daiki, NAKAI Yoshikazu, OTOBE Shogo
    The Japan Society of Mechanical Engineers, 19 Mar. 2011, 関西支部講演会講演論文集, 2011(86) (86), "6 - 8", Japanese

  • 611 Observation and Evaluation of Torsion Fatigue Crack Propagationby uCT Imaging using Synchrotron Radiation
    MURAKAMI Tomonori, NOSYO Hiroaki, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 19 Mar. 2011, 関西支部講演会講演論文集, 2011(86) (86), "6 - 11", Japanese

  • 111 Observation and Evaluation of Crack propagation and branching behavior by Ultra-brightness Synchrotron Radiation CT
    SHIOZAWA Daiki, NOSHO Hiroaki, MURAKAMI Tomonori, NAKAI Yoshikazu
    日本材料学会, 2011, 学術講演会講演論文集, 60, 97 - 98, Japanese

  • 508 Crystal structure analysis using diffraction contrast image
    SHIOZAWA Daiki, NAKAI Yoshikazu
    The novel technique for non-destructive and simultaneous mapping of the three-dimensional grain and the absorption microsiructure of material was developed. This technique is formed X-ray diffraction contrast tomography, and it shares a common experimental setup with conventional X-ray absorption contrast tomography. The grain are imaged using the occasionally occurring diffraction contribution to the X-ray attenuation coefficient each time a grain fulfills the diffraction condition The three-dimensional grain shapes are reconstructed from a limited number of projections using an algebraic reconstruction technique. The crystallographic grain orientation can be determined from the sets of diffraction contrast image. The measurements of diffraction contrast were carried out in SPring-8, which is large synchrotron radiation facility in Japan. The conditions for measurement of diffraction contrast image were investigated and the potential of this technique were discussed in this paper.
    The Japan Society of Mechanical Engineers, 09 Oct. 2010, M&M材料力学カンファレンス, 2010, 343 - 345, Japanese

  • クリープ損傷評価のための結晶3Dマッピング法の開発
    NAKAI Yoshikazu, SHIOZAWA Daiki
    Sep. 2010, 平成21年度 Spring-8重点産業利用課題成果報告書2009B, pp.97-100, Japanese
    Others

  • 高輝度放射光CT法による腐食疲労損傷の発生と成長の観察
    NAKAI Yoshikazu, SHIOZAWA Daiki
    日本工業出版, Aug. 2010, 検査技術, Vol. 15, No. 8, pp.1-7(8) (8), 1 - 7, Japanese
    Introduction scientific journal

  • 金属材料における疲労き裂進展モード遷移条件の解明
    NAKAI Yoshikazu, SHIOZAWA Daiki
    Mar. 2010, 平成21年度Spring-8重点産業利用課題成果報告書2009A, pp.168-170, Japanese
    Others

  • 411 Development of Crystal Structure Analyses using Diffraction Contrast image
    SHIOZAWA Daiki, NAKAI Yoshikazu
    日本材料学会, 2010, 学術講演会講演論文集, 59, 125 - 126, Japanese

  • 高輝度放射光CT法による腐食疲労損傷の観察
    NAKAI Yoshikazu, SHIOZAWA Daiki
    Dec. 2009, 非破壊検査, Vol.58, No.10, pp.446-451, Japanese
    [Refereed]
    Introduction scientific journal

  • OS1207 Observation of corrosion fatigue damage by Synchrotron Radiation μ CT imaging
    SHIOZAWA Daiki, NAKAI Yoshikazu, NAKAGAWA Kazushi
    Pitting corrosion of aluminum alloy serve as nuclei for subsequent fatigue cracking and significantly reduce the serviceable life of structure. In the present study, Micro computed tomography (μCT) with synchrotron radiation of SPring-8 was applied to observe and evaluate the corrosion and corrosion fatigue of aluminum alloy. The compact corrosion fatigue testing machine was developed for flitigue testing by the side of a beam line of SPring-8. The growth of pitting corrosion could be observed nondestructively by using SR CT imaging. It was found that pitting corrosion results from the interactions of the matrix with clusters of particles and inclusions. The growth of pits proceeds inside specimen in the early stage.
    The Japan Society of Mechanical Engineers, 24 Jul. 2009, M&M材料力学カンファレンス, 2009, 658 - 659, Japanese

  • OS0724 Observation of martensitic transformation behavior by fatigue damage in austenitic stainless steels
    MASAKA Takeshi, NAKAI Yoshikazu, SHIOZAWA Daiki, EIJIMA Yoshitaka
    The behavior of the defonnation-induced martensitic transformation in austenitic stainless steels was investigated under monotonic and cyclic loading. The volume fraction of martensitic phase was measured by ferrite scope in the tensile test and the axial fatigue tests. It was found that the martensitic volume fraction ζ, was not detected in early stage of fatigue process under cyclic loading below yield stress that was measured by the tensile test, and ζ increased with increasing in number of cycles. The behavior of martensitic transformation under cyclic deformation agree with the behavior of plastic strain such as cyclic softening and cyclic hardening. The process of martensite transformation can be represented as function of the cumulative plastic strain and the cumulative strain-energy density.
    The Japan Society of Mechanical Engineers, 24 Jul. 2009, M&M材料力学カンファレンス, 2009, 516 - 517, Japanese

  • 823 Development of Non-Destructive Inspection by Using High Temperature SQUID microscope
    ARINO Naoki, SHIOZAWA Daiki, NAKAI Yoshikazu, FUKUI Hirohisa
    The Japan Society of Mechanical Engineers, 16 Mar. 2009, 関西支部講演会講演論文集, 2009(84) (84), "8 - 23", Japanese

  • 702 Observation of Torsional Fatigue Crack by Synchrotron Radiation Micro CT Imaging
    SHIOZAWA Daiki, NAKAI Yoshikazu, NAKAGAWA Kazushi
    日本材料学会, 2009, 学術講演会講演論文集, 58, 151 - 152, Japanese

  • OS0123 Nondestructive Detection for Defect in Printed Wiring by Using High Temperature SQUID
    ARINO Naoki, SHIOZAWA Daiki, NAKAI Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Sep. 2008, M&M材料力学カンファレンス, 2008, "OS0123 - 1"-"OS0123-2", Japanese

  • OS0122 Effect of stress ratio on the change in the magnetization by cyclic deformation in austenitic stainless steel
    Eijima Yoshitaka, Shiozawa Daiki, Nakai Yoshikazu
    The Japan Society of Mechanical Engineers, 16 Sep. 2008, M&M材料力学カンファレンス, 2008, "OS0122 - 1"-"OS0122-2", Japanese

  • 903 Development of Nondestructive Detection for Defect in Printed Wiring by Using SQUID
    FUJIMOTO Takashi, SHIOZAWA Daiki, NAKAI Yoshikazu, SASAKI Osamu
    The Japan Society of Mechanical Engineers, 14 Mar. 2008, 関西支部講演会講演論文集, 2008(83) (83), "9 - 3", Japanese

  • Study on Mechanism of Ultra Long-life Fatigue of Steels by Computed-tomography using Ultabright Synchrotron Radiation
    Yoshikazu Nakai, Hiroshi Tanaka, Chiaki Hiwa, Daiki Shiozawa
    Mar. 2008, Annual Report of Grant-in-Aid for University Study of JFE 21st Century Foundation, 2007, pp.107-112, Japanese
    Introduction scientific journal

  • 316 Effect of Stress Ratio on Magnetism Change in SUS304 Steels by Fatigue Damage
    SHIOZAWA Daiki, NAKAI Yoshikazu, EIJIMA Yoshitaka
    日本材料学会, 2008, 学術講演会講演論文集, 57, 79 - 80, Japanese

  • 超長寿命域における鋼中の疲労損傷の観察
    SHIOZAWA Daiki, NAKAI Yoshikazu
    2008, 平成20年度Spring-8重点産業利用課題成果報告書2008A, pp.73-75, Japanese
    Others

  • 412 Observation of Magnetism change in Crack Initiation Process of SUS304 steel
    SHIOZAWA Daiki, EIJIMA Yoshitaka, NAKAI Yoshikazu
    日本材料学会, 2007, 学術講演会講演論文集, 56, 91 - 92, Japanese

  • 1109 Observation of magnetism change of SUS304 steel infatigue process
    YOKOTA Masaki, NAKAI Yoshikazu, Shiozawa Daiki, Teramoto Yoshihiro
    The Japan Society of Mechanical Engineers, 17 Mar. 2006, 関西支部講演会講演論文集, 2006(81) (81), "11 - 9", Japanese

  • Detection of fatigue cracks in high-strength steels by synchrotron CT imaging
    中井 善一, 田中 拓, 宮下 卓也, 尾角 英毅, 塩澤 大輝, 森影 康
    Mar. 2006, 平成17年度SPring-8トライアルユース成果報告書, pp.80-83, Japanese
    [Refereed]
    Others

  • Evaluation of inclusion in high-strength steel by synchrotron radiation CT imaging
    中井 善一, 田中 拓, 宮下 卓也, 尾角 英毅, 塩澤 大輝, 森影 康
    Mar. 2006, 平成17年度SPring-8トライアルユース成果報告書, pp.48-52, Japanese
    Others

  • 318 Magnetism change in Fatigue Process of SUS304 steel
    SHIOZAWA Daiki, NAKAI Yoshikazu, YOKOTA Masaki, TERAMOTO Norihiro
    日本材料学会, 2006, 学術講演会講演論文集, 55, 269 - 270, Japanese

  • 210 Crack identification and damage monitoring by passive electric potential CT method
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    日本機械学会, 2005, 材料力学部門春のシンポジウム講演論文集, 2005, 89 - 92, Japanese

  • 119 Observation of fatigue damage in SUS 304 steel by scanning magnetic force microscopy
    塩澤 大輝, 中井 善一, 横田 真樹
    日本材料学会, 2005, 学術講演会講演論文集, 54, 225 - 226, Japanese

  • Identification and monitoring of delamination in composites by passive electric potential CT method
    塩澤 大輝, 久保 司郎, 阪上 隆英, 岡崎 俊介, 中谷 健作
    The Japan Society of Mechanical Engineers, 15 Dec. 2004, Symposium on Evaluation and Diagnosis, 2004(3) (3), 73 - 78, Japanese

  • 817 An Application of the Passive Electric Potential Method to Identification of Delamination in Laminated Composite Materials
    OKAZAKI Shunsuke, SHIOZAWA Daiki, NAKATANI Kensaku, KUBO Shiro, SAKAGAMI Takahide
    The passive electric potential CT (computed tomography) method using piezoelectric material have been developed as a health monitoring technique. In this method, piezoelectric film is glued on the surface of a strucrure subjected to external load. Electric potential distribution on the piezoelectric film changes due to the stain distribution on the surface of the structure. If the structure has defects, the stain distribution induces charactristic electric potential distribution, which can be used for the defect identification. In this study, the passive electric potential CT method was applied to laminated composite for the identification of three-dimensional delamination defect. Electric potential distribution on piezoelectric film was caluculated by the finite element method. It was found that electric potential distribution show a charactristic change due to the location, size, and depth of the delamination.
    The Japan Society of Mechanical Engineers, 17 Mar. 2004, 関西支部講演会講演論文集, 2004(79) (79), "8 - 31"-"8-32", Japanese

  • Identification of Multiple Cracks by Passive Electric Potential CT Method and Their Fracture Mechanics Evaluation
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, TAKAGI Masaaki
    The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 645 - 646, Japanese

  • Crack identification by active and passive electric potential CT methods (Special Issue on Inverse Problems)
    KUBO Shiro, SAKAGAMI Takahide, SHIOZAWA Daiki, Shiro KUBO, Takahide SAKAGAMI, Daiki SHIOZAWA
    The active and passive electric potential CT (Computed Tomography) methods for crack identification using the inverse analyses are described. For the active method, which requires applications of electric current, the inverse methods were constructed based on the boundary element method. Examples of the application of the passive electric potential CT method demonstrated the applicability of the method. The passive method, which does not require the application of the electric current, can be constructed by gluing piezoelectric film on the surface of a cracked structure subjected to mechanical load. The inverse method for crack identification is constructed by applying the finite element method, which takes into account the interaction between the strain field and the electric field. The applicability of the passive method is demonstrated by experimental and numerical investigations. Comparison between the active and the passive methods is made.
    日本AEM学会, 10 Jun. 2003, 日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics, 11(2) (2), 73 - 81, Japanese

  • Crack Identification by Passive Electric Potential CT Method Using Piezoelectric Material For Real-time Monitoring System
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKAZAKI Syunsuke
    The Japan Society of Mechanical Engineers, 03 Dec. 2002, Symposium on Evaluation and Diagnosis, 2002(1) (1), 96 - 101, Japanese

  • Identification of Delamination by Passive Electric Potential CT Method Using Piezoelectric Material
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKAZAKI Syunsuke
    The Japan Society of Mechanical Engineers, 30 Oct. 2002, The Computational Mechanics Conference, 2002(15) (15), 411 - 412, Japanese

  • Crack Identification by Passive Electric Potential CT Method Using Piezoelectric Material
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKAZAKI Syunsuke
    日本機械学会, 2002, M&Mレイクサイドサマーシンポジウム講演論文集, 2002, 97 - 100, Japanese

  • An Experimental Study on Applicability of Passive Electric Potential CT Method to Identification of Back Surface Three-Dimensional Crack
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide, OKAZAKI Syunsuke
    When a piezoelectric film is glued on the surface of a cracked material subjected to load, change in distribution of electric potential is observed on the surface of piezoelectric film. Based on this phenomenon, the passive electric potential CT (computed tomography) method was developed for identifying two- and three-dimensional cracks. In this study, this method was experimentally applied to identify three-dimensional crack opening on the back surface. Electric potential distribution on the piezoelectric film mounted on the front surface was measured by non-contact voltmeter. Measured electric potential distribution agreed well with that calculated by FEM. The inverse method based on the least residual method was applied for estimating the location and size of crack from measured electric potential distribution. It was shown that the passive electric potential CT method using piezoelectric film was useful for quantitative identification for back-surface three-dimensional crack.
    The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "2 - 39"-"2-40", Japanese

  • 207 複合材料におけるはく離欠陥同定に対する受動型電気ポテンシャル CT 法の適用性に関する数値的検討
    塩沢 大輝, 久保 司郎, 阪上 隆英, 岡崎 俊介
    日本材料学会, 2002, 学術講演会講演論文集, 51, 43 - 44, Japanese

  • 237 Identification of Back Surface Crack by Passive Electric Potential CT Method Using Measurement on Piezoelectric Polymer Film Attached to Specimen
    SHIOZAWA Daiki, KUBO Shiro, SAKAGAMI Takahide
    When the piezoelectric film is glued on the surface of a cracked material subjected to mechanical load, change in distribution of electric potential is observed on the surface of piezoelectric film. Based on this phenomenon, passive electric potential CT(computed tomography) method was developed for the identification of two- and three-dimensional cracks based on the FEM inverse analysis. In this paper, this method was applied to identify 3-D surface crack opening on the back surface. Numerical simulations were carried out on determination of location and size of back surface crack. It was found that crack parameters were identified within the error of 1.0%, when the noise level of observed electric potential distribution was lower than 0.1%.
    The Japan Society of Mechanical Engineers, 27 Nov. 2001, The Computational Mechanics Conference, 2001(14) (14), 197 - 198, Japanese

■ Books And Other Publications
  • 初心者のための疲労用語の解説
    SHIOZAWA DAIKI
    Others, 公益社団法人 日本材料学会 疲労部門委員会, Sep. 2015, Japanese
    Scholarly book

■ Lectures, oral presentations, etc.
  • 放射光回折コントラストトモグラフィによる調和組織ステンレス鋼の転位密度評価
    相良 俊介, 中川 湧紀, 長谷 卓海, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, KIKUCHI SHOICHI
    日本機械学会関西学生会 2018年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 滋賀県草津市, Domestic conference
    Oral presentation

  • 熱弾性応力および散逸エネルギ計測に及ぼす防食塗装膜の影響
    MOTOBAYASHI Hirotaka, OGINO Yuto, SAKAMOTO Keisuke, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 赤外線計測によるガス検知法の開発
    YAMADA Naoki, NISHIMURA Hiroki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 赤外線サーモグラフィを用いた熱弾性応力計測によるき裂進展性評価
    YAMAMOTO Hiroki, TERAUCHI Yuuki, IHARA Kouki, KOBAYASHI Kazuki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づくアルミ合金材料A5052の疲労強度推定
    MISHIMA Ichiro, CHINZAKA Keita, MINAMISAKO Naoya, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づくFSWに対する疲労限度推定
    TANAKA Yusuke, OGINO Yuto, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づくFSWに対する疲労強度評価
    OGINO Yuuto, TANAKA Yusuke, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第９４期定時総会講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィによる非金属介在物起点の転動疲労き裂発生および進展過程の観察
    倉橋 将紀, 仁科 多可志, 小林 寛, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, KIKUCHI SHOICHI, 根石 豊, 牧野 泰三
    日本機械学会関西学生会 2018年度学生員卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 滋賀県草津市, Domestic conference
    Oral presentation

  • 近赤外線カメラを用いた防食塗膜最表面の劣化の広域検出
    KASUGA Yuuki, MATSUMOTO Yuuki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • テラヘルツ電磁波を用いたGFRP内部欠陥の検出
    GOTO Rigen, SAKAGAMI Takahide, SHIOZAWA Daiki, SADANO Tomoya, NISHIUMI Sou, OHNISHI Yasuyuki
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • Evaluation of Fatigue Properties and Fatigue Crack Propagation in Bimodal Harmonic Structured Austenitic Stainless Steel
    Shoichi Kikuchi, Daiki Shiozawa, Yoshikazu Nakai
    3rd International Symposium on Hetero Structure and Advanced Materials, Mar. 2019, English, 立命館大学, 滋賀県草津市, Domestic conference
    [Invited]
    Invited oral presentation

  • 5-8μm波長帯赤外線サーモグラフィを用いた構造物外壁検査に関する研究
    FUJIYAMA Yoshiki, AZE Hiroki, SHIOZAWA Daiki, SAKAGAMI Takahide, SATO Daisuke
    日本機械学会関西学生会卒業研究発表講演会, Mar. 2019, Japanese, 日本機械学会, 草津市・立命館大学, Domestic conference
    Oral presentation

  • 放射光回折コントラストトモグラフィーによるマグネシウム合金 AZ31 の引張－圧縮過程における変形挙動の観察
    長谷 卓海, 中川 湧紀, 野中 謙次, SHIOZAWA DAIKI, NAKAI YOSHIKAZU, KIKUCHI SHOICHI
    日本機械学会 M&M2018 材料力学カンファレンス, Dec. 2018, Japanese, 日本機械学会, 福井県福井市, Domestic conference
    Oral presentation

  • 赤外線応力計測による鋼橋梁部材の疲労き裂進展性評価と補修効果検証
    TERAUCHI Yuki, IHARA Kouki, SHIOZAWA Daiki, SAKAGAMI Takahide, MIZOKAMI Yoshiaki, ARIMA Noriyasu, HAYASHI
    日本機械学会M&M2018材料力学カンファレンス, Dec. 2018, Japanese, 日本機械学会, 福井市・福井大学, Domestic conference
    Oral presentation

  • 光学―赤外線同期計測による位置補正画像処理を援用した熱弾性応力および散逸エネルギ計測の高精度化
    KOBAYASHI Kazuki, SHIOZAWA Daiki, SAKAGAMI Takahide, HORI Mitsuhiro, UCHIDA Yuji
    日本機械学会M&M2018材料力学カンファレンス, Dec. 2018, Japanese, 日本機械学会, 福井市・福井大学, Domestic conference
    Oral presentation

  • 近赤外線計測による防食塗装膜劣化の定量評価
    MATSUMOTO Yuki, SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOKAMI Yoshiaki, ARIMA Noriyasu, HAYASHI Masahiro
    日本機械学会M&M2018材料力学カンファレンス, Dec. 2018, Japanese, 日本機械学会, 福井市・福井大学, Domestic conference
    Oral presentation

  • 5-8μm波長帯赤外線サーモグラフィを用いた構造物外壁検査に関する研究
    AZE Hiroki, SAKAGAMI Takahide, SHIOZAWA Daiki, CHENG Tzu Yang, SATO Daisuke
    日本機械学会M&M2018材料力学カンファレンス, Dec. 2018, Japanese, 日本機械学会, 福井市・福井大学, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィによる軸受鋼の転動疲労き裂進展挙動に及ぼす非金属介在物の配向の影響評価
    小林 寛, 仁科 多可志, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, KIKUCHI SHOICHI, 根石 豊, 牧野 泰三
    日本材料学会第34回 疲労シンポジウム講演論文集, Oct. 2018, Japanese, 日本材料学会, 京都府京都市, Domestic conference
    Oral presentation

  • 放射光X線ラミノグラフィによる転動疲労損傷発達挙動に及ぼす介在物形態の影響評価
    牧野 泰三, 根石 豊, SHIOZAWA DAIKI, 仁科多可志, 小林 寛, NAKAI YOSHIKAZU
    第15回SPring-8産業利用報告会, Sep. 2018, Japanese, 高輝度光科学財団, 兵庫県神戸市, Domestic conference
    Oral presentation

  • 調和組織材の引張過程におけるミスオリエンテーション変化の観察
    NAKAI YOSHIKAZU, SHIOZAWA DAIKI, KIKUCHI SHOICHI
    第15回SPring-8産業利用報告会, Sep. 2018, Japanese, 高輝度光科学財団, 兵庫県神戸市, Domestic conference
    Oral presentation

  • 熱弾性応力計測による鋼構造部材の疲労き裂進展性評価
    TERAUCHI Yuki, MIZOKAMI Yoshiaki, OKUMURA Atsuhiro, SAKAGAMI Takahide, SHIOZAWA Daiki, HIGASHI+ Tomoyuki
    土木学会第73回年次学術講演会, Aug. 2018, Japanese, 土木学会, 札幌市・北海道大学, Domestic conference
    Oral presentation

  • 赤外線カメラを用いた塗膜劣化評価による実橋調査
    MIZOKAMI Yoshiaki, HAYASHI Masahiro, OKUMURA Atsuhiro, SAKAGAMI Takahide, SHIOZAWA Daiki, MATSUMOTO Yuki
    土木学会第73回年次学術講演会, Aug. 2018, Japanese, 土木学会, 札幌市・北海道大学, Domestic conference
    Oral presentation

  • 近赤外線分光情報を用いた塗膜劣化評価法の提案
    SAKAGAMI Takahide, MIZOKAMI Yoshiaki, SHIOZAWA Daiki, HAYASHI Masahiro, MATSUMOTO Yuki, OKUMURA Atsuhiro
    土木学会第73回年次学術講演会, Aug. 2018, Japanese, 土木学会, 札幌市・北海道大学, Domestic conference
    Oral presentation

  • 近赤外線カメラを用いた重防食塗装最表層の損耗度定量評価
    MATSUMOTO Yuki, SAKAGAMI Takahide, MIZOKAMI Yoshiaki, SHIOZAWA Daiki, HAYASHI Masahiro
    土木学会第73回年次学術講演会, Aug. 2018, Japanese, 土木学会, 札幌市・北海道大学, Domestic conference
    Oral presentation

  • 高輝度放射光を用いたDCT-mCTインライン計測によるSUS304L調和組織材の引張損傷評価
    KIKUCHI SHOICHI, SHIOZAWA DAIKI, 野中 謙次, 長谷 卓海, 中川 湧紀, NAKAI YOSHIKAZU, 飴山惠
    第52回X線材料強度に関するシンポジウム, Jul. 2018, Japanese, 日本材料学会, 静岡県静岡市, Domestic conference
    Oral presentation

  • Fatigue crack evaluation for steel bridge maintenance by infrared thermography
    SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOKAMI Yoshiaki, Masahiro Hayashi, IZUMI Yui
    The Sixth Japan-US NDT Symposium Emerging NDE Capabilities for a Safer World, Jul. 2018, English, JSNDI and ASNT, Hawaii Convention Center, Oahu, Hawaii, USA, International conference
    Oral presentation

  • 放射光X線イメージング技術を活用した転動疲労内部き裂観察
    根石 豊, 牧野 泰三, SHIOZAWA DAIKI, NAKAI YOSHIKAZU, KIKUCHI SHOICHI
    日本ばね学会春季講演会, Jun. 2018, Japanese, 日本ばね学会, 東京都千代田区, Domestic conference
    Oral presentation

  • Fatigue Limit Estimation for Single Bead-on-plate weld Based on Dissipated Energy Measurement
    SHIOZAWA Daiki, OGINO Yuto, WASHIO Takaya, SAKAGAMI Takahide, UEDA Hideki, MAKINO Taizo
    2018 SEM Annual Conference & Exposition, Jun. 2018, English, SEM, Hyatt Regency Greenville, Greenville, South Carolina, USA, International conference
    Oral presentation

  • Fatigue Damage Evaluation by Diffraction Contrast Tomography Using Ultra-Bright Synchrotron Radiation
    Yoshikazu Nakai, Daiki Shiozawa, Naoya Asakawa, Kenji Nonaka, Shoichi Kikuchi
    ICEM 2018, Jun. 2018, English, Brussels, Belgium, International conference
    Keynote oral presentation

  • Evaluation of Fatigue Damage in Short Carbon Fiber Reinforced Plastics Based on Thermoelastic Stress and Phase Analysis
    SAKAGAMI Takahide, SHIOZAWA Daiki, NAKAMURA Yu, NONAKA Shinichi, HAMADA Kenichi
    2018 SEM Annual Conference & Exposition, Jun. 2018, English, SEM, Hyatt Regency Greenville, Greenville, South Carolina, USA, International conference
    Oral presentation

  • 熱弾性応力計測に基づく鋼構造溶接部の疲労き裂進展性評価
    IHARA Kouki, MIZOKAMI Yoshiaki, HAYASHI Masahiro, SAKAGAMI Takahide, SHIOZAWA Daiki, HIGASHI Tomoyuki, TERAUCHI Yuki
    日本材料学会第67期学術講演会, May 2018, Japanese, 日本材料学会, 高知市・高知工科大学, Domestic conference
    Oral presentation

  • アクティブ赤外線サーモグラフィ法による自動車構造材料の非破壊評価
    YAMASHITAFUJI Takoto, SAKAHARA Keisuke, SHIOZAWA Daiki, KAWAI Kousuke, IIZUKA Takashi, SHIMIZU Seigo, TAKAHASHI Kazuya, ITO Kunpei, SAKAGAMI Takahide
    日本材料学会第67期学術講演会, May 2018, Japanese, 日本材料学会, 高知市・高知工科大学, Domestic conference
    Oral presentation

  • Observation of Flaking Process in Rolling Contact Fatigue by Laminography Using Ultra-bright Synchrotron Radiation
    Yoshikazu Nakai, Daiki Shiozawa, Hitoshi Saito, Takashi Nishina, Shoichi Kikuchi, Taizo Makino, Yutaka Neishi
    Fatigue 2018, May 2018, English, Poitiers, France, International conference
    Oral presentation

  • Application of infrared camera for steel bridge maintenance
    SAKAGAMI Takahide, MIZOKAMI Yoshiaki, SHIOZAWA Daiki, Masahiro Hayashi, Masahiro Takeguchi
    SPIE Defense + Commercial and Sensing 2018, Thermosense: Thermal Infrared Applications XL, Apr. 2018, English, SPIE, Gaylord Palms Resort & Convention Center, Orlando, Florida, USA, International conference
    Oral presentation

  • 放射光DCTインライン計測によるSUS304L調和組織材のミスオリエンテーション変化の観察
    長谷 卓海, 野中 謙次, 中川 湧紀, SHIOZAWA DAIKI, 菊池 将一, NAKAI YOSHIKAZU, 川畑 美絵, 飴山 惠
    2017年度関西学生会学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会, 摂南大学，寝屋川市, Domestic conference
    Oral presentation

  • 高強度鋼の転動疲労損傷に及ぼす人口欠陥と硫化物系介在物の影響の高輝度放射光ラミノグラフィによる観察
    牧野 泰三, 根石 豊, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 菊池 将一
    第334回疲労部門委員会, Mar. 2018, Japanese, 日本材料学会, シーガイアコンベンションセンター，宮崎市, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィによる非金属介在物を起点とした転動疲労き裂の発生および進展過程の観察
    小林 寛, 齋藤 仁史, 仁科 多可志, 菊池 将一, NAKAI YOSHIKAZU, SHIOZAWA DAIKI, 根石 豊, 牧野 泰三
    2017年度関西学生会学生員卒業研究発表講演会, Mar. 2018, Japanese, 日本機械学会, 摂南大学，寝屋川市, Domestic conference
    Oral presentation

  • 放射光 DCT インライン計測による金属材料の疲労過程中のミスオリエンテーション変化の観察
    中川 湧紀, 野中 謙次, 淺川 直也, SHIOZAWA DAIKI, 菊池 将一, NAKAI YOSHIKAZU
    M&M2017材料力学カンファレンス, Oct. 2017, Japanese, 日本機械学会, 北海道大学，札幌市, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に及ぼす塗膜の影響
    SHIOZAWA Daiki, OGINO Yuuto, WASHIO Takaya, UEDA Hideki, MAKINO Taizo, SAKAGAMI Takahide
    日本機械学会 M&M2017材料力学カンファレンス, Oct. 2017, Japanese, 日本機械学会, 札幌市・北海道大学, Domestic conference
    Oral presentation

  • 高強度鋼の転動疲労損傷に及ぼす非金属介在物の影響の高輝度放射光ラミノグラフィによる観察
    仁科 多可志, SHIOZAWA DAIKI, 齋藤 仁史, 菊池 将一, 根石 豊, 牧野 泰三, NAKAI YOSHIKAZU
    M&M2017材料力学カンファレンス, Oct. 2017, Japanese, 日本機械学会, 北海道大学，札幌市, Domestic conference
    Oral presentation

  • 熱弾性応力分布計測結果の破壊力学評価による鋼構造部材の疲労き裂進展性評価
    SAKAGAMI Takahide, MIZOKAMI Yoshiaki, OKUMURA Atsuhiro, SHIOZAWA Daiki, FUJIMOTO Taisei, HIGASHI Tomoyuki, IZUMI Yui
    土木学会第72回年次学術講演会, Sep. 2017, Japanese, 土木学会, 福岡市・九州大学, Domestic conference
    Oral presentation

  • 熱弾性応力分布計測結果の破壊力学評価による鋼橋の疲労き裂補修効果の検証
    HIGASHI Tomoyuki, MIZOKAMI Yoshiaki, NAKAYAMA Kazuma, SAKAGAMI Takahide, SHIOZAWA Daiki, FUJIMOTO Taisei, IZUMI Yui
    土木学会第72回年次学術講演会, Sep. 2017, Japanese, 土木学会, 福岡市・九州大学, Domestic conference
    Oral presentation

  • TSA based evaluation of fatigue crack propagation in steel bridge members
    SAKAGAMI Takahide, MIZOKAMI Yoshiaki, SHIOZAWA Daiki, IZUMI Yui, MORIYAMA Akira
    2nd International Conference on Structural Integrity, Sep. 2017, English, ICSI, Funchal, Madeira, Portugal, International conference
    Oral presentation

  • Rolling Contact Fatigue Damage from Artificial Defects and Sulphide Inclusions in High Strength Steel
    Taizo Makino, Yutaka Neishi, Daiki Shiozawa, Shoichi Kikuchi, Hitoshi Saito, Kentaro Kajiwara, Yoshikazu Nakai
    3rd International Symposium on Fatigue Design and Material Defects (FDMD) 2017, Sep. 2017, English, Itallian Fracture Group, Lecco, Italy, International conference
    Oral presentation

  • Effect of mean stress on phase difference of dissipated energy
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, WASHIO Takaya, SAKAGAMI Takahide
    AITA2017, The 14th International Workshop on Advanced Infrared Technology and Applications, Sep. 2017, English, AITA, Quebec-city, Canada, International conference
    Oral presentation

  • Detection of fatigue damage in short carbon fiber reinforced plastics using thermoelasticity
    SAKAGAMI Takahide, SHIOZAWA Daiki, NAKAMURA Yu, NONAKA Shinichi, HAMADA Kenichi
    AITA2017, The 14th International Workshop on Advanced Infrared Technology and Applications, Sep. 2017, English, AITA, Quebec-city, Canada, International conference
    Oral presentation

  • Change of misorientation of individual crystallographic planes in fatigue of alloys by diffraction contrast tomography using ultrabright synchrotron radiation
    Yoshikazu Nakai, Daiki Shiozawa, Naoya Asakawa, Kenji Nonaka, Shoichi Kikuchi
    European Congress and Exhibition on Advanced Materials and Processes (EUROMAT) 2017, Sep. 2017, English, Thessaloniki Concert Hall, Thessaloniki, Greece, International conference
    Oral presentation

  • Crack Initiation and Propagation Behaviors under Rolling Contact Fatigue Observed by Laminography Using Synchrotron Radiation X-ray
    Yoshikazu Nakai, Daiki Shiozawa, Shoichi Kikuchi, Tomoya Obama, Hitoshi Saito, Takashi Nishina, Taizo Makino, Yutaka Neishi
    14th International Conference on Fracture (ICF14), Jun. 2017, English, Rodos Palace Hotel, Rhodes, Greece, International conference
    Oral presentation

  • 赤外線サーモグラフィを用いた黄銅に対する散逸エネルギ計測
    CHINZAKA Keita, FUNAZO Shunsuke, SHIOZAWA Daiki, AKAI Atsushi, SAKAGAMI Takahide
    日本材料学会第６６期学術講演会, May 2017, Japanese, 日本材料学会, 名古屋市・名城大学, Domestic conference
    Oral presentation

  • 散逸エネルギ測定に基づく疲労強度推定法のアルミニウム合金A6061-T6 への適用
    AKAI Atsushi, FUNAZO Shunsuke, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会第６６期学術講演会, May 2017, Japanese, 日本材料学会, 名古屋市・名城大学, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づくビードオンプレート溶接部材に対する疲労限度推定
    OGINO Yuuto, WASHIO Takaya, SHIOZAWA Daiki, UEDA Hideki, MAKINO Taizo, SAKAGAMI Takahide
    日本材料学会第６６期学術講演会, May 2017, Japanese, 日本材料学会, 名古屋市・名城大学, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィを用いた軸受鋼の転動疲労き裂進展挙動に及ぼすMnS介在物配向の影響評価
    仁科 多可志, SHIOZAWA DAIKI, 齋藤 仁史, 菊池 将一, 根石 豊, 牧野 泰三, NAKAI YOSHIKAZU
    第66期学術講演会, May 2017, Japanese, 日本材料学会, 名城大学，名古屋市, Domestic conference
    Oral presentation

  • Fatigue limit estimation of titanium alloy Ti-6Al-4V with infrared thermography
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    SPIE Defense + Commercial Sensing 2017, Thermosense: Thermal Infrared Applications XXXIX, Apr. 2017, English, SPIE, Anaheim Convention Center, Anaheim, California, USA, International conference
    Poster presentation

  • Fatigue damage evaluation of short fiber CFRP based on phase information of thermoelastic temperature change
    SHIOZAWA Daiki, SAKAGAMI Takahide, NAKAMURA Yu, NONAKA Shinichi, HAMADA Kenichi
    SPIE Defense + Commercial Sensing 2017, Thermosense: Thermal Infrared Applications XXXIX, Apr. 2017, English, SPIE, Anaheim Convention Center, Anaheim, California, USA, International conference
    Oral presentation

  • 放射光回折コントラストトモグラフィを用いたマグネシウム合金 AZ31 における組織観察
    中川 湧紀, 淺川 直也, 野中 謙次, SHIOZAWA DAIKI, KIKUCHI SHOICHI, NAKAI YOSHIKAZU
    平成28年度関西学生会学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学; 吹田市, Domestic conference
    Oral presentation

  • 熱弾性応力可視化計測による鋼橋梁の疲労き裂補修効果の検証
    TERAUTCH Yuki, FUJIMOTO Taisei, HIGASHI Tomoyuki, SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOKAMI Yoshiaki, MORIYAMA Akira
    日本機械学会関西支部平成28年度卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • 赤外線サーモグラフィを用いた銅合金に対する散逸エネルギ計測
    珍坂恵大, Tinzaka, HUNAZO Syunsuke, AKAI Atsushi, SHIOZAWA Daiki, Sakagami Takahide
    日本機械学会関西支部平成29年度卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • 赤外線サーモグラフィを用いた高倍率温度計測の取り組み
    OKUNO Sota, SAKAGAMI Takahide, SHIOZAWA Daiki, AKAI Atsushi
    日本機械学会関西支部第91期定時総会講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • 軸受鋼の転動疲労機構に及ぼす非金属介在物の影響の高輝度放射光ラミノグラフィによる観察
    仁科 多可志, SHIOZAWA DAIKI, 齋藤 仁史, KIKUCHI SHOICHI, 根石 豊, 牧野 泰三, NAKAI YOSHIKAZU
    平成28年度関西学生会学生員卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学; 吹田市, Domestic conference
    Oral presentation

  • 散逸エネルギ測定に基づく疲労損傷評価に関する研究≪SUS316L鋼の熱処理条件の変化に対する疲労限度推定法の適用性≫
    AKAI Atsushi, SAKAGAMI Takahide, SHIOZAWA Daiki
    日本材料学会東海支部 第11回学術講演会, Mar. 2017, Japanese, 日本材料学会東海支部, 名古屋大学, Domestic conference
    Oral presentation

  • ビードオンプレート溶接部における散逸エネルギ計測
    OGINO Yuto, WASHIO Takaya, SHIOZAWA Daiki, UEDA Hideki, MAKINO Taizo, SAKAGAMI Takahide
    日本機械学会関西支部平成29年度卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • THz-TDSを用いた石油タンク底部鋼板の健全性評価
    NISHIUMI Sou, IWAMA Tatsuya, SAKAGAMI Takahide, SHIOZAWA Daiki, SEKINE Kazuyoshi, MARUYAMA Hiroaki
    日本機械学会関西支部平成29年度卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • THz-TDSを用いた石油タンク底部コーティングの劣化評価における滞留水分の影響評価
    SADANO Tomoya, IWAMA Tatsuya, SAKAGAMI Takahide, SHIOZAWA Daiki, SEKINE Kazuyoshi, MARUYAMA Hiroaki
    日本機械学会関西支部平成29年度卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • Change of misorientation of individual grains in fatigue of polycrystalline alloys by diffraction contrast tomography using ultrabright synchrotron radiation
    NAKAI YOSHIKAZU, Shiozawa Daiki, ASAKAWA NAOYA, NONAKA KENJI, Kikuchi Shoich
    XXIV Italian Group of Fracture Conference, Mar. 2017, English, Urbino, International conference
    Oral presentation

  • 5～8μm中間波長帯赤外線サーモグラフィによる建物診断時の反射低減効果
    AZE Hiroki, SATO Daisuke, TAKEUCHI Yuto, SAKAGAMI Takahide, SHIOZAWA Daiki
    日本機械学会関西支部平成29年度卒業研究発表講演会, Mar. 2017, Japanese, 日本機械学会関西支部, 大阪大学, Domestic conference
    Oral presentation

  • 放射光ラミノグラフィを用いた転動疲労におけるき裂進展挙動のその場観察
    SHIOZAWA Daiki, KIKUCHI Syoichi, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    第 53 回 X 線材料強度に関する討論会, Dec. 2016, Japanese, 日本材料学会 X線強度部門委員会, 名古屋, Domestic conference
    Oral presentation

  • 散逸エネルギ測定に基づく損傷評価技術の開発 －疲労損傷評価の高精度化に向けた取り組み－
    AKAI Atsushi, SAKAGAMI Takahide, SHIOZAWA Daiki
    日本材料学会関西支部 第11回若手シンポジウム, Dec. 2016, Japanese, 日本材料学会関西支部, 大津市, Domestic conference
    Poster presentation

  • 放射光インライン計測によるステンレス鋼の疲労損傷評価
    野中 謙次, 淺川 直也, 中尾 亮太, SHIOZAWA DAIKI, KIKUCHI SHOICHI, NAKAI YOSHIKAZU
    M&M2016材料力学カンファレンス, Oct. 2016, Japanese, 日本機械学会, 神戸大学; 神戸市, Domestic conference
    Oral presentation

  • 熱弾性応力測定法による鋼構造溶接部の疲労き裂補修効果の検証
    HIGASHI Tomonori, FUJIMOTO Taisei, SAKAGAMI Takahide, SHIOZAWA Daiki, MIZOGAMI Yoshiaki, HANAI Taku, Moriyama Akira
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • 熱弾性応力測定に基づく合成床版の疲労損傷評価
    YAMASHITA Takehiro, SHIOZAWA Daiki, SAKAGAMI Takahide, MIZUNO Hiroshi, IZUMI Yui, MATSUI Shigeyuki
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • 短繊維CFRPにおける熱弾性温度変動の位相情報を用いた損傷評価
    NAKAMURA Yu, TAMASHIRO, SHIOZAWA Daiki, SAKAGAMI Takahide, SAWADA Hidetsugu, NONAKA Shinichi, HAMADA Kenichi
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • 走査加熱を用いたアクティブ赤外線サーモグラフィ法による非破壊検査
    TAKEUCHI YUTO, SAKAGAMI Takahide, SHIOZAWA Daiki, HANAI Taku, MIZOKAMI Yoshiaki, MORIYAMA Akira
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • 赤外線サーモグラフィを用いた散逸エネルギの顕微計測
    OKUNO Sota, YAMADA Taiki, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Oral presentation

  • 散逸エネルギ測定に基づく材料の損傷評価「疲労限度と疲労破壊箇所の迅速推定」
    AKAI Atsushi, HUNAZO Syunsuke, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会関東支部 学生研究交流会, Oct. 2016, Japanese, 日本材料学会関東支部, 東京都・早稲田大学, Domestic conference
    Oral presentation

  • 散逸エネルギ測定に基づくガセット溶接継手に対するき裂発生位置予測
    WASHIO Takaya, SHIOZAWA Daiki, UEDA Hideki, MAKINO Taizo, SAKAGAMI Takahide
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • 散逸エネルギ計測に基づく疲労限度推定法の軽量化合金への適用性
    AKAI Atsushi, HUNAZO Syunsuke, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィを用いた転動疲労き裂発生および進展挙動に及ぼす介在物配向の影響
    齋藤 仁史, SHIOZAWA DAIKI, 小濱 友也, KIKUCHI SHOICHI, 根石 豊, 牧野 泰三, NAKAI YOSHIKAZU
    M&M2016材料力学カンファレンス, Oct. 2016, Japanese, 日本機械学会, 神戸大学; 神戸市, Domestic conference
    Oral presentation

  • パルス加熱赤外線サーモグラフィ法による溶射皮膜材料の非破壊評価
    SAKAHARA Keisuke, SAKAGAMI Takahide, SHIOZAWA Daiki, TSUJI kazu, Ueno, ITO Yoshiyasu
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • テラヘルツ電磁波による3Dイメージングに関する基礎検討
    岩間 達也IWAMA Tastuya, SHIOZAWA Daiki, SAKAGAMI Takahide, SEKINE Kazuyoshi, MARUYAMA Yoshiaki, OGASAWARA Masakazu
    日本機械学会 M&M2016材料力学カンファレンス,, Oct. 2016, Japanese, 日本機械学会, 神戸大学, Domestic conference
    Poster presentation

  • Ti-6Al-4Vの超高サイクル疲労における内部破壊初期過程の放射光µCTイメージング
    吉中 奎貴, 中村 孝, 髙久和 明, SHIOZAWA DAIKI, NAKAI YOSHIKAZU, 上杉 健太朗
    M&M2016材料力学カンファレンス, Oct. 2016, Japanese, 日本機械学会, 神戸大学; 神戸市, Domestic conference
    Oral presentation

  • Inclusion Orientation Effect on Rolling Contact Fatigue Crack Paths Observed by Laminography Using Synchrotron Radiation X-Ray
    NAKAI YOSHIKAZU, Shiozawa Daiki, Kikuchi Shoichi, OBAMA TOMOYA, SAITO HITOSHI, MAKINO TAIZO, NEISHI YUTAKA
    MS&T 16, Oct. 2016, English, Salt Lake City, International conference
    Oral presentation

  • 熱弾性応力測定による鋼構造の疲労き裂補修対策実施効果の検証
    FUJIMOTO Taisei, MIZOKAMI Yoshiaki, HANAI Taku, SAKAGAMI Takahide, SHIOZAWA Daiki, HIGASHI Tomoyuki
    土木学会第71回年次学術講演会, Sep. 2016, Japanese, 土木学会, 仙台市・東北大学, Domestic conference
    Oral presentation

  • 突起リブを採用した鋼コンクート合成床版に対する熱弾性応力測 定に基づく底鋼板下面の応力評価
    YAMASHITA Takehiro, IZUMI Yui, MIZUNO Hiroshi, OGASAWARA Teruo, SASAKI Hidetomo, SHIOZAWA Daiki, SAKAGAMI Takahide, MATSUI Shigeyuki
    土木学会第71回年次学術講演会, Sep. 2016, Japanese, 土木学会, 仙台市・東北大学, Domestic conference
    Oral presentation

  • 鋼床版支点部補剛材に生じた亀裂の補修
    NAKAYAMA Kazuma, KOSHINO Masaru, HANAI Taku, SAKAGAMI Takahide, SHIOZAWA Daiki, IZUMI Yui
    土木学会第71回年次学術講演会, Sep. 2016, Japanese, 土木学会, 仙台市・東北大学, Domestic conference
    Oral presentation

  • Nondestructive evaluation of fatigue damage in CFRP composites based on thermoelastic stress analysis
    SHIOZAWA Daiki, SAKAGAMI Takahide
    日本非破壊検査協会赤外線サーモグラフィ部門ミニシンポジウム, Sep. 2016, Japanese, 日本材料学会破壊力学部門委員会非破壊検査小委員会, 神戸大学, Domestic conference
    Oral presentation

  • Effects of inclusion size and orientation on rolling contact fatigue crack initiation observed by laminography using ultra-bright synchrotron radiation
    NAKAI YOSHIKAZU, Shiozawa Daiki, Kikuchi Shoichi, OBAMA TOMOYA, SAITO HITOSHI, MAKINO TAIZO, NEISHI YUTAKA
    21st European Conference on Fracture, Jun. 2016, Japanese, Catania, International conference
    Oral presentation

  • 熱弾性温度変動の位相解析に基づく短繊維CFRPにおける繊維配向性の評価
    NAKAMURA Yu, TAMASHIRO, SHIOZAWA Daiki, SAKAGAMI Takahide, SAWADA Hidetsugu, NONAKA Shinichi, HAMADA Kenichi
    日本材料学会第65期学術講演会, May 2016, Japanese, 日本材料学会, 富山大学, Domestic conference
    Oral presentation

  • 赤外線サーモグラフィによる顕微拡大散逸エネルギ測定によるSUS316L鋼の疲労損傷評価
    AKAI Atsushi, YAMADA Taiki, OKUNO Sota, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会第65期学術講演会, May 2016, Japanese, 日本材料学会, 富山大学, Domestic conference
    Oral presentation

  • ステンレス鋼における高サイクル疲労中のミスオリエンテーション変化の放射光DCTによる観察
    野中 謙次, 中尾 亮太, 淺川 直也, SHIOZAWA DAIKI, KIKUCHI SHOICHI, NAKAI YOSHIKAZU
    第65期学術講演会, May 2016, Japanese, 日本材料学会, 富山大学; 富山市, Domestic conference
    Oral presentation

  • MnS介在物を起点とした転動疲労き裂発生および成長の高輝度放射光ラミノグラフィによる4D観察
    齋藤 仁史, SHIOZAWA DAIKI, 小濱 友也, KIKUCHI SHOICHI, 根石 豊, 牧野 泰三, NAKAI YOSHIKAZU
    第65期学術講演会, May 2016, Japanese, 日本材料学会, 富山大学; 富山市, Domestic conference
    Oral presentation

  • Misorientation measurement of individual grains in fatigue of polycrystalline alloys by diffraction contrast tomography using ultrabright synchrotron radiation
    NAKAI YOSHIKAZU, Shiozawa Daiki, NAKAO RYOTA, ASAKAWA NAOYA, Kikuchi Shoichi
    THERMEC‘2016, May 2016, English, Graz, International conference
    [Invited]
    Invited oral presentation

  • 熱弾性応力計測に基づく合成床版スタッドの疲労き裂発生検出
    YAMASHITA Takahiro, SHIOZAWA Daiki, SAKAGAMI Takahide, MIZUNO Hiroshi, IZUMI Yui, MATSUI Shigeyuki
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 赤外線サーモグラフィを用いた微小試験片に対する熱弾性応力測定
    OKUNO Souta, YAMADA Taiki, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 赤外線サーモグラフィを用いた熱弾性応力測定－微小部品の応力測定を目指して－
    AKAI ATSUSHI, YAMADA Taiki, OKUNO Souta, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づいた疲労強度およびき裂発生位置の迅速推定
    SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 高分子系複合材料の赤外線計測に基づく疲労損傷評価
    TAMASHIRO Takato, NAKAMURA Yu, SHIOZAWA Daiki, SAKAGAMI Takahide, SAWADA Hidetsugu, NONAKA Shinichi, HAMADA Kenichi
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 高分子系複合材料における散逸エネルギ計測
    NAKAMURA Yu, TAMASHIRO Takato, SHIOZAWA Daiki, SAKAGAMI Takahide, SAWADA Hidetsugu, NONAKA Shinichi, HAMADA Kenichi
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィによるMnS介在物を起点とした転動疲労き裂進展過程の観察
    SAITO Hitoshi, SHIOZAWA Daiki, OBAMA Tomoya, KIKUCHI Shoichi, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 寝屋川市, Domestic conference
    Oral presentation

  • 高輝度放射光によるオーステナイト系ステンレス鋼の疲労過程におけるミスオリエンテーション変化の観察
    NONAKA Kenji, NAKAO Ryota, ASAKAWA Naoya, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAI Yoshikazu
    日本機械学会関西学生会平成27年度学生員卒業研究発表講演会, Mar. 2016, Japanese, 寝屋川市, Domestic conference
    Oral presentation

  • 逆問題解析を用いた防食塗装膜下の熱弾性応力測定
    IINO Keito, SAKAGAMI Takahide, SHIOZAWA Daiki
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼における応力および散逸エネルギの顕微計測
    YAMADA Taiki, OKUNO Sota, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • THz-TDSを用いた塗装膜下鋼板の健全性評価
    TAMAKI Yoshitaka, 岩間 達也IWAMA Tatsuya, SAKAGAMI Takahide, SHIOZAWA Daiki, SEKINE Kazuyoshi, SHIOMI Teruya
    日本機械学会関西支部第91期定時総会講演会, Mar. 2016, Japanese, 日本機械学会関西支部, 大阪電気通信大学, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィを用いた転動疲労き裂の発生および進展過程の観察
    OBAMA Tomoya, SHIOZAWA Daiki, KIKUCHI Shoichi, MAKINO Taizo, NEISHI Yutaka, NAKAI Yoshikazu
    日本機械学会M&M2015材料力学カンファレンス, Nov. 2015, Japanese, 横浜市, Domestic conference
    Oral presentation

  • 高輝度放射光によるステンレス鋼の疲労におけるミスオリエンテーション評価
    NAKAO Ryota, ASAKAWA Naoya, MATSUDA Shota, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAI Yoshikazu
    日本機械学会M&M2015材料力学カンファレンス, Nov. 2015, Japanese, 横浜市, Domestic conference
    Oral presentation

  • 位相情報を用いた散逸エネルギ測定および疲労限度推定の高精度化
    鷲尾 貴哉, WASHIO Takaya, INAGAWA Tsuyoshi, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会M&M2015 材料力学カンファレンス, Nov. 2015, Japanese, 日本機械学会材料力学部門, 慶應義塾大学, Domestic conference
    Oral presentation

  • マグネシウム合金AZ31Bにおける散逸エネルギ測定
    FUNAZOU Syunsuke, YAMASHIRO Kenji, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会M&M2015 材料力学カンファレンス, Nov. 2015, Japanese, 日本機械学会材料力学部門, 慶應義塾大学, Domestic conference
    Oral presentation

  • テラヘルツ電磁波による欠陥イメージングに関する基礎的研究
    IWAMA Tatsuya, TAMAKI Yoshitaka, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会M&M2015 材料力学カンファレンス, Nov. 2015, Japanese, 日本機械学会材料力学部門, 慶應義塾大学, Domestic conference
    Oral presentation

  • 顕微拡大視野赤外線サーモグラフィを用いた熱弾性応力測定の基礎的検討
    AKAI ATSUSHI, YAMADA Daiki, SHIOZAWA DAIKI, SAKAGAMI TAKAHIDE
    第17回破壊力学シンポジウム, Oct. 2015, Japanese, 日本材料学会, 京都市, Domestic conference
    Oral presentation

  • Evaluation of High Cycle Fatigue Damagefor Austenitic Stainless Steel by Diffraction Contrast TomographyUsing Ultra-bright Synchrotron Radiation
    ASAKAWA Naoya, SHIOZAWA Daiki, KIKUCHI Shoichi, MATSUDA Shota, NAKAO Ryota, NAKAI Yoshikazu
    International Conference on Advanced Technology in Experimental Mechanics 2015, Oct. 2015, English, Toyohashi,JAPAN, International conference
    Oral presentation

  • 4D Observations of Pit Growth and Crack Initiation under Corrosion Fatigue of High-strength Aluminum Alloy by Micro CT Imaging Using Ultra-bright Synchrotron Radiation
    Nakai Yoshikazu, Shiozawa Daiki, Okada, Shoichi
    International Conference on Advanced Technology in Experimental Mechanics 2015 (ATEM’15), Oct. 2015, English, 日本機械学会材料力学部門, 豊橋市, International conference
    Oral presentation

  • 4D Observation of Crack Propagation Behavior under Rolling Contact Fatigue by Synchrotron Radiation Laminography
    OBAMA Tomoya, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAI Yoshikazu, NEISHI Yutaka, MAKINO Taizo
    International Conference on Advanced Technology in Experimental Mechanics 2015, Oct. 2015, English, Toyohashi,JAPAN, International conference
    Oral presentation

  • 放射光X線ラミノグラフィによる鉄鋼材料の転動疲労損傷観察
    MAKINO Taizo, NEISHI Yutaka, SHIOZAWA Daiki, KIKUCHI Shoichi, OBAMA Tomoya, SAITO Hitoshi, NAKAI Yoshikazu
    第12回SPring-8産業利用報告会, Sep. 2015, Japanese, 川崎市, Domestic conference
    Poster presentation

  • 回折コントラストイメージングによる金属材料の疲労損傷評価
    NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAO Ryota, ASAKAWA Naoya
    第12回SPring-8産業利用報告会, Sep. 2015, Japanese, 川崎市, Domestic conference
    Poster presentation

  • In situ observation of rolling contact fatigue cracks by laminography using ultrabright synchrotron radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi, Sato Kazuya, OBAMA Tomoya
    The 5th International Conference on Crack Paths, Sep. 2015, English, Ferrara,ITALY, International conference
    Oral presentation

  • Fatigue Limit Estimation Based on Dissipated Energy for Pre-Strained Materials
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, WASHIO Takaya, SAKAGAMI Takahide
    ATEM'15: International Conference on Advanced Technology in Experimental Mechanics 2015, Sep. 2015, English, 日本機械学会, Toyohashi, Japan, International conference
    Oral presentation

  • Effect of defect length on rolling contact fatigue crack propagation in high strength steel
    MAKINO Taizo, NEISHI Yutaka, SHIOZAWA Daiki, KIKUCHI Shoichi, OKADA Sota, KAJIWARA Kentaro, NAKAI Yoshikazu
    The 5th International Conference on Crack Paths, Sep. 2015, English, Ferrara,ITALY, International conference
    Oral presentation

  • パルスサーモグラフィおよびテラヘルツ計測によるコーティング下の腐食検出
    SAKAGAMI Takahide, SHIOZAWA Daiki, TAMAKI Yoshitaka, ITO Hiroki, MORIGUCHI Akihisa, IWAMA Tatsuya, SEKINE Kazuyoshi, SHIOMI Teruya
    赤外線サーモグラフィ部門ミニシンポジウム, Aug. 2015, Japanese, 日本非破壊検査協会, 三鷹市, Domestic conference
    Oral presentation

  • 高輝度放射光の回折コントラストトモグラフィーによる疲労すべりの3D観察
    NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi
    日本材料学会 第321回疲労部門委員会, Jul. 2015, Japanese, The Society of Materials Science Japan, committee on fatigue of materials, 姫路市, Domestic conference
    Invited oral presentation

  • 深さ方向に異なる長さの人工欠陥を導入した高強度鋼の転動疲労特性
    MAKINO Taizo, NEISHI Yutaka, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAI Yoshikazu
    日本材料学会 第64期学術講演会, May 2015, Japanese, 日本材料学会, 米沢市, Domestic conference
    Oral presentation

  • 散逸エネルギ測定によるSUS316L鋼予ひずみ材の疲労強度評価
    WASHIO Takaya, SHIOZAWA Daiki, INAGAWA Tsuyoshi, SAKAGAMI Takahide
    第64期日本材料学会学術講演会, May 2015, Japanese, 日本材料学会, 米沢市, Domestic conference
    Oral presentation

  • 高輝度放射光を用いた回折コントラストトモグラフィによるSUS316L鋼の高サイクル疲労損傷の評価
    ASAKAWA Naoya, MATSUDA Shota, NAKAO Ryota, SHIOZAWA Daiki, KIKUCHI Shoichi, NAKAI Yoshikazu
    日本材料学会 第64期学術講演会, May 2015, Japanese, 日本材料学会, 米沢市, Domestic conference
    Oral presentation

  • 位相ロックイン法を用いた散逸エネルギ測定の改善
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, SAKAGAMI Takahide
    第64期日本材料学会学術講演会, May 2015, Japanese, 日本材料学会, 米沢市, Domestic conference
    Oral presentation

  • Fatigue damage evaluation of polycrystaline alloy by diffraction contrast tomography using ultra-bright synchrotron radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki, KIKUCHI Shoichi, MATSUDA Shota, NAKAO Ryota
    12th International Conference on the Materials Behavior of Materials, May 2015, English, Karlsruhe,GERMANY, International conference
    Oral presentation

  • Accuracy improvement of fatigue damage evaluation based on phase analysis of dissipated energy
    SHIOZAWA Daiki, INAGAWA Tsuyoshi, AKAI Atushi, SAKAGAMI Takahide
    ICM12, 12th International Conference on the Mechanical Behavior of Materials, May 2015, English, Karlsruhe, Germany, International conference
    Oral presentation

  • 放射光ラミノグラフィを用いた転動疲労き裂進展の4D 解析
    Shiozawa Daiki, 小濱 友也, 佐藤 一矢, Kikuchi Shoichi, 根石 豊, 牧野 泰三, Nakai Yoshikazu
    日本機械学会関西支部 第90 期定時総会講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都大学 桂キャンパス;京都市, Domestic conference
    Oral presentation

  • 熱弾性応力測定法に基づくき裂進展抑制効果の検証
    KANDA Takuro, ENDO Hideki, 石川 敏之, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第90期定時総会講演会(修士研究発表セッション), Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • 熱弾性応力計測に基づく鋼構造のき裂進展評価
    FUJIMOTO Taisei, OTANI Naoya, 小林 義弘, 溝上 善昭, IZUMI Yui, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会平成26年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • 熱弾性応力計測に基づく橋梁の構造健全性評価
    OTANI Naoya, 小林 義弘, 溝上 善昭, IZUMI Yui, FUJIMURA Taisei, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第90期定時総会講演会(修士研究発表セッション), Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • 赤外線温度計測に基づく疲労き裂の非破壊評価
    SAKAGAMI Takahide, SHIOZAWA Daiki, IZUMI Yui
    日本機械学会関西支部第90期定時総会講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都市, Domestic conference
    Oral presentation

  • 散逸エネルギ測定に基づくSUS316L鋼予ひずみ材の疲労限度評価
    WASHIO Takaya, INAGAWA Tsuyoshi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会平成26年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づくキャビテーション材の疲労限度予測
    INAGAWA Tsuyoshi, WASHIO Takaya, SHIOZAWA Daiki, SAKAGAMI Takahide, 祖山 均
    日本機械学会関西支部第90期定時総会講演会(修士研究発表セッション), Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • 散逸エネルギに基づく疲労限度推定における推定メカニズムに関する検討
    SHIOZAWA Daiki, AKAI Atsushi, INAGAWA Tsuyoshi, YAMASHIRO Kenji, SAKAGAMI Takahide
    日本機械学会関西支部第90期定時総会講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都市, Domestic conference
    Oral presentation

  • 高輝度放射光を用いた回折コントラストトモグラフィーによる高サイクル疲労損傷評価
    淺川 直也, 松田 翔太, 中尾 亮太, Shiozawa Daiki, Kikuchi Shoichi, Nakai Yoshikazu
    日本機械学会関西学生会平成26 年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都大学 桂キャンパス;京都市, Domestic conference
    Oral presentation

  • 高輝度放射光ラミノグラフィーを用いた転動疲労き裂進展観察
    宇都 裕貴, 小濱 友也, 佐藤 一矢, Shiozawa Daiki, Kikuchi Shoichi, Neishi Yutaka, Makino Taizo, Nakai Yoshikazu
    日本機械学会関西学生会平成26 年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都大学 桂キャンパス;京都市, Domestic conference
    Oral presentation

  • 高輝度放射光の回折コントラストイメージングによる疲労過程中の転位構造変化の観察
    Nakai Yoshikazu, Shiozawa Daiki, 松田 翔太, 中尾 亮太, 浅川 直也, Kikuchi Shoichi
    日本機械学会関西支部 第90 期定時総会講演会, Mar. 2015, Japanese, 日本機械学会関西支部, 京都大学 桂キャンパス;京都市, Domestic conference
    Oral presentation

  • マグネシウム合金AZ31Bにおける散逸エネルギ測定に及ぼす高調波応力成分の影響
    FUNAZO Syunsuke, YAMASHIRO Kenji, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会平成26年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • マグネシウム合金AZ31B における散逸エネルギを用いた疲労限度推定
    YAMASHIRO Kenji, FUNAZO Syunsuke, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第90期定時総会講演会(修士研究発表セッション), Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • パルス加熱赤外線サーモグラフィ法による防食塗装膜の潜在的劣化評価
    ITO Koki, KOUTA Yuikio, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第90期定時総会講演会(修士研究発表セッション), Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • アクティブ赤外線サーモグラフィ法によるコーキング厚さ同定
    SATO SHInji, 加次 淳一郎, ITO Koki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会平成26年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • THz-TDS を用いた保温材下の腐食検出に関する基礎検討
    IWAMA Tatsuya, TAMAKI Yoshitaka, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会平成26年度学生員卒業研究発表講演会, Mar. 2015, Japanese, 日本機械学会関西支部, Domestic conference
    Oral presentation

  • 放射光ラミノグラフィによる介在物起点の転動疲労き裂進展挙動の観察
    Makino Taizo, Neishi Yutaka, Shiozawa Daiki, Kikuchi Shoichi, 宇都 裕貴, 小濱 友也, 佐藤 一矢, Nakai Yoshikazu
    第10回SPring-8金属材料評価研究会, Feb. 2015, Japanese, 高輝度光科学研究センター, 研究社英語センタービル;東京都, Domestic conference
    Invited oral presentation

  • 赤外線温度計測に基づく疲労き裂の非破壊評価法
    SAKAGAMI Takahide, IZUMI Yui, SHIOZAWA Daiki, KUBO Shiro
    日本材料学会第51回X線材料強度に関する討論会, Dec. 2014, Japanese, 日本材料学会, 名古屋市, Domestic conference
    [Invited]
    Invited oral presentation

  • A new approach for evaluating stress intensity factor based on thermoelastic stress analysis
    IZUMI Yui, SAKAGAMI Takahide, YASUMURA Koki, SHIOZAWA Daiki
    The APCFS/SIF-2014 Congress uniting: Asian-Pacific Conference on Fracture and Strength (APCFS-2014), International Conference on Structural Integrity and Failure (SIF-2014), Dec. 2014, English, Sydney, Australia, International conference
    Oral presentation

  • Evaluation of Fatigue Damage in Polycrystalline Alloys by Diffraction Contrast Tomography using Ultra-bright Synchrotron Radiation
    Shiozawa Daiki, Nakai Yoshikazu, Miura Ryota, Matsuda Syota
    Proceedings of the 3rd Japan-China Joint Symposium on Fatigue of Engineering Materials and Structures, Nov. 2014, English, 日本材料学会, 高山市民会館;高山市, International conference
    Invited oral presentation

  • 散逸エネルギ計測に基づく疲労限度評価法に関する実験的検討
    SAKAGAMI Takahide, SHIOZAWA Daiki
    日本高圧力技術協会平成26年度秋季講演会, Oct. 2014, Japanese, 日本高圧力技術協会, 松山市, Domestic conference
    Oral presentation

  • 4D evaluation of grain shape and fatigue damage of individual grain in polycrystalline alloys by diffraction contrast tomography using ultra-bright synchrotron radiation
    Shiozawa Daiki, Nakai Yoshikazu, Miura Ryota, Matsuda Shota
    International Conference on Fatigue Damage of Structural Materials X, Sep. 2014, English, The Resort and Conference Center at Hyannis; MA; USA, International conference
    Oral presentation

  • 高輝度放射光ラミノグラフィを用いた高強度鋼中の転動疲労き裂の観察
    小濱 友也, Shiozawa Daiki, 佐藤 一矢, Neishi Yutaka, Makino Taizo, Nakai Yoshikazu
    日本機械学会材料力学カンファレンス(M&M2014), Jul. 2014, Japanese, 日本機械学会, 福島大学;福島市, Domestic conference
    Oral presentation

  • Observation of rolling contact fatigue cracks by laminography using ultra-bright synchrotron radiation
    Shiozawa Daiki, Makino Taizo, Neishi Yutaka, Nakai Yoshikazu
    20th European Conference on Fracture (ECF20), Jul. 2014, English, Norwegian University of Science and Technology; Trondheim; Norway, International conference
    Oral presentation

  • 放射光回折コントラストトモグラフィによる低サイクル疲労の損傷評価
    中尾 亮太, Shiozawa Daiki, Nakai Yoshikazu, 政田 尚也, 松田 翔太
    日本材料学会第63期学術講演会, May 2014, Japanese, 日本材料学会, 福岡大学;福岡市, Domestic conference
    Oral presentation

  • 放射光回折コントラストトモグラフィによる低サイクル疲労の損傷評価
    中尾 亮太, SHIOZAWA Daiki, 政田 尚也, 松田 翔太, NAKAI Yoshikazu
    日本機械学会関西学生会平成25年度学生員卒業研究発表講演会, Mar. 2014, Japanese, 日本機械学会, 大阪府立大学，堺, Domestic conference
    Oral presentation

  • 放射光ラミノグラフィによる高強度鋼における転動疲労き裂の観察
    小濱 友也, SHIOZAWA Daiki, 岡田 宗大, 佐藤 一矢, 根石 豊, 牧野 泰三, NAKAI Yoshikazu
    日本機械学会関西学生会平成25年度学生員卒業研究発表講演会, Mar. 2014, Japanese, 日本機械学会, 大阪府立大学，堺, Domestic conference
    Oral presentation

  • 熱弾性応力分布測定に基づく混合モード応力拡大係数評価
    YASUMURA Kouki, IZUMI Yui, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第89期定時総会講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conference
    Oral presentation

  • 展伸マグネシウム合金AZ31 の散逸エネルギ計測による疲労限度推定
    YAMADA Taiki, YAMASHIRO Kenji, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部平成25 年度学生員卒業研究発表講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conference
    Oral presentation

  • 展伸マグネシウム合金AZ31B の散逸エネルギ計測による疲労限度評価
    YAMASHIRO Kenji, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西支部第89期定時総会講演会, Mar. 2014, Japanese, 日本機械学会関西支部, 大阪府立大学, Domestic conference
    Oral presentation

  • 高感度磁気センサを用いた渦電流探傷システムによる深部欠陥の検出に関する研究
    志田 貴文, NAKAI Yoshikazu, SHIOZAWA DAIKI
    日本機械学会関西支部 第89期定時総会講演会, Mar. 2014, Japanese, 日本機械学会, 大阪府立大学，堺, Domestic conference
    Oral presentation

  • ピエゾセンサシートおよび逆問題解析を用いた接触センシングの開発
    岡田 好史, SHIOZAWA DAIKI, NAKAI Yoshikazu
    日本機械学会関西支部 第89期定時総会講演会, Mar. 2014, Japanese, 日本機械学会, 大阪府立大学，堺, Domestic conference
    Oral presentation

  • Fatigue of ultra-fine grained α-brass
    NAKAI Yoshikazu, IMANAKA Takuto, SHIOZAWA Daiki
    11th International Fatigue Congress (Fatigue 2014), Mar. 2014, English, Melbourne, Australia, International conference
    Oral presentation

  • Experimental study of relationship between energy dissipation and fatigue damage from observation of slip band by atomic force microscope
    SHIOZAWA Daiki, INABA Ken, AKAI Atsushi, SAKAGAMI Takahide
    Fatigue 2014, Mar. 2014, English, RMT university, Melbourne, Australia, International conference
    Oral presentation

  • Evaluation of Fatigue Damage by Diffraction Contrast Imaging using Ultra-bright Synchrotron Radiation
    SHIOZAWA Daiki, NAKAI Yoshikazu, MIURA Ryotaro, MATSUDA Shota
    11th International Fatigue Congress (Fatigue 2014), Mar. 2014, English, Melbourne, Australia, International conference
    Oral presentation

  • 展伸マグネシウム合金における散逸エネルギと疲労損傷の関係
    YAMASHIRO Kenji, YAMADA Taiki, SHIOZAWA Daiki, SAKAGAMI Takahide
    第63期日本材料学会学術講演会, 2014, Japanese, 日本材料学会, Domestic conference
    Oral presentation

  • 展伸 Mg 合金 AZ31B における散逸エネルギと変形機構との関係
    YAMADA Taiki, YAMASHIRO Kenji, SHIOZAWA Daiki, SAKAGAMI Takahide
    M&M2014材料力学カンファレンス, 2014, Japanese, 日本機械学会材料力学部門, Domestic conference
    Oral presentation

  • 散逸エネルギの位相情報を用いた疲労損傷評価の改善
    INAGAWA Tsuyoshi, SHIOZAWA Daiki, SAKAGAMI Takahide
    M&M2014材料力学カンファレンス, 2014, Japanese, 日本機械学会材料力学部門, Domestic conference
    Oral presentation

  • 散逸エネルギの位相情報を用いた疲労損傷評価
    INAGAWA Tsuyoshi, SHIOZAWA Daiki, YAMADA Taiki, SAKAGAMI Takahide
    第63期日本材料学会学術講演会, 2014, Japanese, 日本材料学会, Domestic conference
    Oral presentation

  • 混合モード下の赤外線応力測定に基づくき裂の応力拡大係数評価
    YASUMURA Koki, IZUMI Yui, SAKAGAMI Takahide, SHIOZAWA Daiki
    第63期日本材料学会学術講演会, 2014, Japanese, 日本材料学会, Domestic conference
    Oral presentation

  • 逆問題解析を援用したコーティング下の応力測定
    IINO Keito, SAKAGAMI Takahide, SHIOZAWA Daiki
    本機械学会 第27回計算力学講演会(CMD2014), 2014, Japanese, 日本機械学会計算力学部門, Domestic conference
    Oral presentation

  • ガラス短繊維複合材料における散逸エネルギ計測
    TAMASHIRO Takato, INAGAWA Tsuyoshi, SHIOZAWA Daiki, SAKAGAMI Takahide, 澤田 栄嗣, 兼本 道成, 荒木 大輔
    M&M2014材料力学カンファレンス, 2014, Japanese, 日本機械学会材料力学部門, Domestic conference
    Oral presentation

  • Evaluation of Fatigue Damage by Diffraction Contrast Imaging using Ultra-bright Synchrotron Radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki, MIURA Ryota
    International Conference on Processing & Manufacturing of Advanced Materials (THERMEC'2013), Dec. 2013, English, Las Vegas, USA, International conference
    [Invited]
    Invited oral presentation

  • 放射光μCTイメージングによる腐食疲労におけるピットの成長及びき裂発生過程の4D解析
    岡田 宗大, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本材料学会第16回破壊力学シンポジウム講演論文集, pp.321-316 (2013, 11.20-22, 阿蘇ファームランド)., Nov. 2013, Japanese, 日本材料学会, 阿蘇ファームランド，熊本, Domestic conference
    Oral presentation

  • 散逸エネルギ評価に基づくSUS316L鋼表面改質材の疲労限度評価
    INAGAWA Tsuyoshi, AKAI Atsushi, INABA Ken, SHIOZAWA Daiki, SAKAGAMI Takahide
    本材料学会 信頼性・破壊力学合同シンポジウム(第16回破壊力学シンポジウム), Nov. 2013, Japanese, 日本材料学会, 阿蘇ファームランド, Domestic conference
    Oral presentation

  • 高輝度放射光を用いた回折コントラストイメージによるき裂発生過程の結晶組織観察
    政田 尚也, 松田 翔太, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本材料学会第16回破壊力学シンポジウム講演論文集, pp.312-316 (2013, 11.20-22, 阿蘇ファームランド)., Nov. 2013, Japanese, 日本材料学会, 阿蘇ファームランド，熊本, Domestic conference
    Oral presentation

  • 放射光μCT 及び小型転動疲労試験機を用いた転動疲労き裂進展過程の観察
    佐藤 一矢, SHIOZAWA Daiki, 根石 豊, 牧野 泰三, NAKAI Yoshikazu
    日本機械学会材料力学カンファレンス(M&M2013), Oct. 2013, Japanese, 日本機械学会, 岐阜大学，岐阜, Domestic conference
    Oral presentation

  • 放射光μCT イメージングを用いたTi-6Al-4V 内部に発生する微小疲労き裂の検出
    中山 慎也, 中村 孝, 小熊 博幸, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会材料力学カンファレンス(M&M2013), Oct. 2013, Japanese, 日本機械学会, 岐阜大学，岐阜, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づく展伸マグネシウム合金の疲労限度評価
    SHIOZAWA Daiki, 山城 研二, 稲川 毅, 岡江 秀樹, SAKAGAMI TAKAHIDE, NAKAI Yoshikazu
    日本機械学会材料力学カンファレンス(M&M2013), Oct. 2013, Japanese, 日本機械学会, 岐阜大学，岐阜, Domestic conference
    Oral presentation

  • 高輝度放射光を用いた回折コントラストトモグラフィによる疲労損傷評価に関する検討
    松田 翔太, 政田 尚也, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会材料力学カンファレンス(M&M2013), Oct. 2013, Japanese, 日本機械学会, 岐阜大学，岐阜, Domestic conference
    Oral presentation

  • α黄銅超微細結晶粒材の疲労強度
    NAKAI Yoshikazu, 今中 拓人, SHIOZAWA Daiki
    日本機械学会材料力学カンファレンス(M&M2013), Oct. 2013, Japanese, 日本機械学会, 岐阜大学，岐阜, Domestic conference
    Oral presentation

  • SUS316L鋼表面改質材の散逸エネルギ計測による疲労限度評価
    INAGAWA Tsuyoshi, AKAI Atsushi, INABA Ken, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会 M&M2013材料力学カンファレンス, Oct. 2013, Japanese, 日本機械学会, 岐阜大学, Domestic conference
    Oral presentation

  • Experimental study of relationship between energy dissipation and fatigue damage initiation based on observation of slip band by atomic force microscope
    INABA Ken, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    International Conference on Advanced Infrared Technology and Applications2013, Sep. 2013, English, Torino, Italy, International conference
    Oral presentation

  • Fatigue limit estimation based on dissipated energy measurement for steel specimen with multiple notches
    INABA Ken, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    13th International Symposium on Nondestructive Characterization of Materials, May 2013, English, Center for Nondestructive Evaluation, Le Mans, France,, International conference
    Oral presentation

  • Evaluation of Fatigue Damage by Diffraction Contrast TomographyUsing Synchrotron Radiation
    SHIOZAWA DAIKI, MIURA RYOTARO, MATSUDA SYOTA, NAKAI YOSHIKAZU
    13th International Symposium on Nondestructive Characterization of Materials, May 2013, English, International conference
    Oral presentation

  • AFMによるすべり帯観察に基づく散逸エネルギの発生および疲労限度予測メカニズムに関する検討
    INABA Ken, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会第62期学術講演会, May 2013, Japanese, 日本材料学会, 東京工業大学, Domestic conference
    Oral presentation

  • 放射光μCT 及び小型転動疲労試験機を用いた高強度鋼における転動疲労下のき裂進展過程の観察
    佐藤 一矢, SHIOZAWA Daiki, 根石 豊, 牧野 泰三, NAKAI Yoshikazu, 岡田 宗大
    日本機械学会関西学生会平成 24 年度学生員卒業研究発表講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • 放射光μCTイメージモデルに基づいた有限要素解析によるねじり疲労き裂進展挙動の評価
    納庄 宏明, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第88期定時総会講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • 散逸エネルギを用いた圧延マグネシウム合金における疲労損傷評価
    岡江 秀樹, 乙部 彰吾, 赤井 淳嗣, SHIOZAWA Daiki, SAKAGAMI TAKAHIDE, NAKAI Yoshikazu
    日本機械学会関西学生会平成 24 年度学生員卒業研究発表講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • 高輝度放射光を用いた回折コントラストトモグラフィによる金属組織評価
    松田 翔太, 三浦 亮太郎, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成 24 年度学生員卒業研究発表講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • 高輝度放射光による三次元結晶マッピング法を用いた多結晶金属組織観察
    三浦 亮太郎, 松田 翔太, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第88期定時総会講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • 黄銅超微細結晶粒材作製法の開発とその強度評価
    今中 拓人, 堤 湧貴, NAKAI Yoshikazu, SHIOZAWA Daiki
    日本機械学会関西支部第88期定時総会講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • 黄銅の微細結晶粒化と強度評価
    堤 湧貴, 今中 拓人, NAKAI Yoshikazu, SHIOZAWA Daiki
    日本機械学会関西学生会平成 24 年度学生員卒業研究発表講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • グリーンコンポジットへの適用を目的としたアブラヤシ繊維の強度評価
    大谷 寛知, SIA Charlie, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成 24 年度学生員卒業研究発表講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼における疲労限度の簡易予測法
    乙部 彰吾, SHIOZAWA Daiki, NAKAI Yoshikazu, 岡江 秀樹
    日本機械学会関西支部第88期定時総会講演会, Mar. 2013, Japanese, 日本機械学会, 大阪市, Domestic conference
    Oral presentation

  • Influence of Alkali Treatment on the Mechanical Properties of Oil Palm Fibers
    SIA Charlie, NAKAI Yoshikazu, SHIOZAWA Daiki
    第４回日本複合材料合同会議, Mar. 2013, English, 日本材料学会, 東京都, Domestic conference
    Oral presentation

  • 回折コントラストトモグラフィーによる結晶組織観察と損傷評価への適用
    SHIOZAWA DAIKI
    第26回日本放射光学会年会 放射光科学合同シンポジウム, Jan. 2013, Japanese, 名古屋大学, Domestic conference
    [Invited]
    Nominated symposium

  • 放射光μCT イメージングを用いた高強度鋼における転動疲労き裂進展挙動の観察
    SHIOZAWA Daiki, 岡田 宋大, 根石 豊, 牧野 泰三, NAKAI Yoshikazu, 福田 嘉之
    日本材料学会第31回疲労シンポジウム, Nov. 2012, Japanese, 日本材料学会, 横浜市, Domestic conference
    Oral presentation

  • Observation of crack propagation behavior under rolling contact fatigue in high strength steel by syncrotron radiation micro-CT imaging
    Daiki Shiozawa, Sota Okada, Yoshikazu Nakai, Yutaka Neishi, Taizo Makino, Yoshiyuki Fukuda
    The 31th Symposium on Fatigue, Nov. 2012, Japanese, 公益社団法人 日本材料学会, 慶應義塾大学 日吉キャンパス, Domestic conference
    Oral presentation

  • Observation of Crack Propagation under Rolling Contact Fatigue in High-Strength Steels by Micro CT Imaging
    OKADA Souta, SHIOZAWA Daiki, NEISHI Yutaka, MAKINO Taizo, NAKAI Yoshikazu
    The 5th International Symposium on Designing, Processing and Properties of Advanced Engineering Materials (ISAEM-201), Nov. 2012, English, 豊橋市, International conference
    Oral presentation

  • Evaluation of Plastic Strain by Three-Dimensional Grain Mapping Technique Using SPring-8
    MIURA Ryotaro, SHIOZAWA Daiki, NAKAI Yoshikazu, MASADA Naoya
    The 5th International Symposium on Designing, Processing and Properties of Advanced Engineering Materials (ISAEM-2012), Nov. 2012, English, 豊橋市, International conference
    Oral presentation

  • 散逸エネルギ計測に基づく複数切欠き試験片に対する疲労限度予測
    INABA Ken, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会M&M2011材料力学カンファレンス, Sep. 2012, Japanese, 日本機械学会, 松山市, Domestic conference
    Oral presentation

  • Observation of Fatigue Crack Propagation Mode Transition under Cyclic Torsion Using Micro-CT Imaging with Ultra-Bright Synchrotron Radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki, MURAKAMI Tomonori, NOSHO Hiroaki
    The 4th International Conference on Crack Paths (CP 2012), Sep. 2012, English, Gaeta, Italy, International conference
    [Invited]
    Invited oral presentation

  • Evaluation of rolling contact fatigue crack path of high strength steel with artificial defect
    MAKINO Taizo, akino, NEISHI Yutaka, SHIOZAWA Daiki, FUKUDA Yoshiyuki, NAKAI Yoshikazu
    The 4th International Conference on Crack Paths (CP 2012), , 19 - 21 September, 2012, Sep. 2012, English, Gaeta, Italy, International conference
    Oral presentation

  • RELATIONSHIP BETWEEN DISSIPATED ENERGY AND FATIGUE LIMIT FOR AUSTENITIC STAINLESS STEEL
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide, OTOBE Shogo, INABA Ken
    15th International Conference on Experimental Mechanics, Jul. 2012, English, Porto, Portugal, International conference
    Oral presentation

  • Observation of Cracks in Carbon Steel under Contact Rolling Fatigue by Micro CT Imaging using Ultra-bright Synchrotron Radiation
    SHIOZAWA Daiki, NAKAI Yoshikazu, FUKUDA Yoshiyuki, NEISHI Yutaka, MAKINO Taizo
    15th International Conference on Experimental Mechanics, Jul. 2012, English, Porto, Portugal, International conference
    Oral presentation

  • Development of Three-Dimensional Grain Mapping Technique in Spring-8 and Evaluation of Plastic Strain
    SHIOZAWA Daiki, NAKAI Yoshikazu, TSUTSUMI Kenta, MIURA Ryotaro, KAJIWARA Kentaro
    15th International Conference on Experimental Mechanics, Jul. 2012, English, Porto, Portugal, International conference
    Oral presentation

  • 結晶3Dマッピング法による塑性ひずみ評価法の開発
    SHIOZAWA Daiki, 三浦 亮太郎, 政田 尚也, NAKAI Yoshikazu
    日本材料学会・第６１期通常総会・学術講演会, May 2012, Japanese, 日本材料学会, 岡山市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の散逸エネルギ計測に基づく疲労限度予測に及ぼすマルテンサイト変態の影響
    AKAI Atsushi, INABA Ken, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会第61期学術講演会, May 2012, Japanese, 日本材料学会, 岡山市, Domestic conference
    Oral presentation

  • 放射光μCTを用いた高強度鋼における転動疲労下のき裂観察
    福田 嘉之, 岡田 宗大, 根石 豊, 牧野 泰三, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第87期定時総会講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conference
    Oral presentation

  • 高分子ピエゾセンサシートを利用した逆問題的計測手法の開発
    岡田 好史, 蔵敷 佳秀, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成23年度学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conference
    Oral presentation

  • 高輝度放射光の回折コントラストイメージを用いた三次元結晶マッピング法
    堤 健太, NAKAI Yoshikazu, SHIOZAWA Daiki, 三浦 亮太郎, 政田 尚也
    日本機械学会関西支部第87期定時総会講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conference
    Oral presentation

  • 高感度MIセンサを用いた漏洩および渦電流式欠陥検出法の開発
    小川 晃, 志田 貴文, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第87期定時総会講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conference
    Oral presentation

  • 高感度MIセンサを用いた漏洩および渦電流式欠陥検出
    志田 貴文, 小川 晃, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成23年度学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の散逸エネルギ計測による疲労限度評価
    INABA Ken, AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本機械学会関西学生会平成23年度卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会, 吹田市, Domestic conference
    Oral presentation

  • CTイメージングを用いた高強度鋼の転動疲労下のき裂観察
    岡田 宗大, 福田 嘉之, 根石 豊, 牧野 泰三, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成23年度学生員卒業研究発表講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 吹田市, Domestic conference
    Oral presentation

  • SUS304鋼の散逸エネルギと疲労限度の関係
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会第15回破壊力学シンポジウム, Nov. 2011, Japanese, 日本材料学会, 石垣市, Domestic conference
    Oral presentation

  • Observation of Delamination Defects and Cracks in High-strength Steels under Rolling Contact Fatigue by SR Micro CT Imaging
    SHIOZAWA Daiki, NEISHI Yutaka, FUKUDA Yoshiyuki, MAKINO Taizo, NAKAI Yoshikazu
    International Conference on Advanced Technology in Experimental Mechanics 2011, Sep. 2011, English, JSME, Kobe, Japan, International conference
    Oral presentation

  • Evaluation of Torsional Fatigue Crack Propagation by Synchrotron Radiation Micro-CT Imaging
    SHIOZAWA Daiki, NAKAI Yoshikazu, MURAKAMI Tomonobu, NOSHO Hiroaki
    International Conference on Advanced Technology in Experimental Mechanics 2011, Sep. 2011, English, JSME, Kobe, Japan, International conference
    Oral presentation

  • Dissipated energy evaluation during fatigue test for austenitic stainless steel with thermography
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    ATEM’11 International Conference on Advanced Technology in Experimental Mechanics 2011, Sep. 2011, English, JSME, Kobe, International conference
    Oral presentation

  • Development of Three-dimensional Grain Mapping Technique Using SPring-8
    SHIOZAWA Daiki, TSUTSUMI Kenta, NAKAI Yoshikazu, KAJIWARA Kentaro
    International Conference on Advanced Technology in Experimental Mechanics 2011, Sep. 2011, English, JSME, Kobe, Japan, International conference
    Oral presentation

  • 放射光μCTを用いた高強度鋼の転動疲労下のき裂検出
    福田 嘉之, SHIOZAWA Daiki, 根石 豊, 牧野 泰三, NAKAI Yoshikazu
    日本機械学会M&M2011材料力学カンファレンス, Jul. 2011, Japanese, 日本機械学会, 北九州市, International conference
    Oral presentation

  • 散逸エネルギ評価法によるSUS304 鋼の疲労限度推定の測定条件に関する検討
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    M&M2011材料力学カンファレンス, Jul. 2011, Japanese, 日本機械学会, 北九州市, Domestic conference
    Oral presentation

  • SUS304 鋼の疲労試験での散逸エネルギ評価
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    M&M2011材料力学カンファレンス, Jul. 2011, Japanese, 日本機械学会, 北九州市, Domestic conference
    Oral presentation

  • SUS304鋼の応力誘起マルテンサイト変態挙動を利用した疲労損傷評価
    乙部 彰吾, SHIOZAWA Daiki, NAKAI Yoshikazu, 真坂 剛史
    日本機械学会M&M2011材料力学カンファレンス, Jul. 2011, Japanese, 日本機械学会, 北九州市, International conference
    Oral presentation

  • Observation of Fatigue Crack Propagation Behavior under Torsional Loading by Using Synchrotron Radiation Micro-CT Imaging
    SHIOZAWA Daiki, NAKAI Yoshikazu, MURAKAMI Tomonori, NOSHO Hiroaki
    11th International Conference on Mechanical Behavior of Materials, Jun. 2011, English, ICM, Lake Como, Italy, International conference
    Oral presentation

  • 高輝度放射光CTによるねじり疲労き裂の進展・分岐挙動の観察と評価
    SHIOZAWA Daiki, 納庄 宏明, 村上 智宣, NAKAI Yoshikazu
    日本材料学会第60期学術講演会, May 2011, Japanese, 日本材料学会, 吹田市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の疲労試験における散逸エネルギ評価
    AKAI Atsushi, SHIOZAWA Daiki, SAKAGAMI Takahide
    日本材料学会第60期学術講演会, May 2011, Japanese, 日本材料学会, 吹田市, Domestic conference
    Oral presentation

  • 放射光μCT画像に基づいた三次元再構成モデルを用いたねじり疲労き裂進展挙動の評価
    納庄 宏明, 村上 智宣, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成22年度学生員卒業研究発表講演会(2011年3月18日, 京都工芸繊維大学), Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • 放射光μCTイメージングを用いたねじり疲労き裂進展挙動の観察と評価
    村上 智宣, 納庄 宏明, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第86期定時総会講演会, Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づく疲労損傷過程の評価
    AKAI Atsushi, SAKAGAMI Takahide, SHIOZAWA Daiki
    日本機械学会関西支部 第86期定時総会講演会, Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • 回折コントラストイメージを用いた三次元結晶マッピング法の開発
    三浦 亮太郎, 堤 健太, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成22年度学生員卒業研究発表講演会(2011年3月18日, 京都工芸繊維大学), Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • 黄銅の微細結晶粒材料の作製とその疲労強度評価
    今中 拓人, 孫 夢泉, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成22年度学生員卒業研究発表講演会(2011年3月18日, 京都工芸繊維大学), Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の疲労損傷過程における加工誘起マルテンサイト変態挙動の観察と評価
    真坂 剛史, SHIOZAWA Daiki, NAKAI Yoshikazu, 乙部 彰吾
    日本機械学会関西支部第86期定時総会講演会, Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の加工誘起マルテンサイト変態を用いた疲労損傷評価
    乙部 彰吾, 真坂 剛史, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西学生会平成22年度学生員卒業研究発表講演会(2011年3月18日, 京都工芸繊維大学), Mar. 2011, Japanese, 日本機械学会, 京都市, Domestic conference
    Oral presentation

  • 散逸エネルギ計測に基づく疲労損傷過程の評価
    AKAI Atsushi, SAKAGAMI Takahide, SHIOZAWA Daiki
    日本機械学会関西支部機械の強度と形態研究懇話会第7 回NCP フォーラム, Feb. 2011, Japanese, 日本機械学会, あわら市, Domestic conference
    Oral presentation

  • Initiation and Growth of Corrosion Fatigue Pits and Cracks in High Strength Aluminum Alloy Observed by Micro Computed-tomography Using Ultra-bright Synchrotron Radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki
    International Conference on Experimental Mechanics (ICEM 2010), Dec. 2010, English, Asian Society on Experimental Mechanics, Kuala Lumpur, Malaysia, International conference
    Oral presentation

  • 回折コントラストイメージを用いた結晶構造解析
    SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会 M&M2010材料力学カンファレンス, Oct. 2010, Japanese, 日本機械学会, 長岡市, Domestic conference
    Oral presentation

  • Observations of corrosion pits and cracks in corrosion fatigue of high strength aluminum alloy by computed-tomography using synchrotron radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki
    14th International Conference on Experimental Mechanics (ICEM 14), Jul. 2010, English, Eura SEM, Poitiers, France, International conference
    Oral presentation

  • Observation of crack propagation under torsion fatigue tests by synchrotrpn mCT imaging
    SHIOZAWA Daiki, NAKAI Yoshikazu, MURAKAMI Tomonobu
    10th International Fatigue Congress (Fatigue 2010), Jun. 2010, English, Institute of Physics of Materials ASCR, Prague, Czech Republic, International conference
    Oral presentation

  • 高分子圧電材料を用いたスマートシートセンサの開発
    KURASHIKI Yoshihide, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第85期関西学生会学生員卒業研究発表講演会., Mar. 2010, Japanese, 日本機械学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • 高温超伝導SQUID顕微鏡を用いたプリント配線の非破壊欠陥検査法の開発
    UEMURA Yuki, SHIOZAWA Daiki, NAKAI Yoshikazu
    日本機械学会関西支部第85期関西学生会学生員卒業研究発表講演会., Mar. 2010, Japanese, 日本機械学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の疲労損傷によるマルテンサイト変態挙
    OGAWA Akira, SHIOZAWA Daiki, NAKAI Yoshikazu, MASAKA Takeshi
    日本機械学会関西支部第85期関西学生会学生員卒業研究発表講演会., Mar. 2010, Japanese, 日本機械学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • Zr基バルク金属ガラスのKISCC近傍におけるき裂伝ぱ挙動
    OGAWA Toyohiko, NAKAI Yoshikazu, SHIOZAWA Daiki
    日本機械学会関西支部第85期関西学生会学生員卒業研究発表講演会., Mar. 2010, Japanese, 日本機械学会関西支部, 神戸市, Domestic conference
    Oral presentation

  • Observation of Fretting Fatigue Cracks by Micro Computed-Tomography using Ultrabright Synchrotron Radiation
    NAKAI Yoshikazu, SHIOZAWA Daiki, KURIMURA Takayuki, KAJIWARA Kentaro
    The 4th International Conference on Experimental Mechanics, Nov. 2009, English, Asian Conference on Experimental Mechanics, Singapore, Domestic conference
    Oral presentation

  • 放射光μCTイメージングによる腐食疲労損傷の観察
    SHIOZAWA Daiki, NAKAI Yoshikazu, NAKAGAWA Kazushi
    M&Mカンファレンス2009, Jul. 2009, Japanese, 日本機械学会, 札幌市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の疲労損傷によるマルテンサイト変態挙動の観察
    MASAKA Takeshi, NAKAI Yoshikazu, SHIOZAWA Daiki, EIJIMA Yoshimine
    日本機械学会M&M2009 材料力学カンファレンス, Jul. 2009, Japanese, 日本機械学会, 札幌市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の疲労損傷によるマルテンサイト変態挙動の観察
    MASAKA Takeshi, NAKAI Yoshikazu, SHIOZAWA Daiki, EIJIMA Yoshitaka
    M&Mカンファレンス2009, Jul. 2009, Japanese, 日本機械学会, 札幌市, Domestic conference
    Oral presentation

  • Observation of Fretting Fatigue Cracks by Micro Computed Tomography with Synchrotron Radiation
    SHIOZAWA Daiki, NAKAI Yoshikazu, KURIMURA Takayuki, KAJIWARA Kentaro
    The 12th International Conference on Fracture (ICF-12), Jul. 2009, English, International Conference on Fracture, Ottawa, Canada, Domestic conference
    Oral presentation

  • Observation of Fretting fatigue Cracks by Micro Computed Tomography with Synchrotron Radiation
    SHIOZAWA Daiki, NAKAI Yoshikazu, KURIMURA Takayuki, KAJIWARA Kentaro
    12th International conference on fracture, Jul. 2009, English, Natural Resource Canada, Ottawa,Canada, International conference
    Oral presentation

  • 放射光マイクロCTイメージングによるねじり疲労き裂の観察
    SHIOZAWA Daiki, NAKAI Yoshikazu, NAKAGAWA Kazushi
    日本材料学会第58期学術講演会, May 2009, Japanese, 日本材料学会, 松山市, Domestic conference
    Oral presentation

  • 放射光μCTを用いたTi合金におけるねじり疲労き裂進展挙動の観察
    中川 和士, SHIOZAWA Daiki, NAKAI Yoshikazu
    関西学生会平成20年度学生員卒業研究発表講演会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference
    Oral presentation

  • 高温超電導SQUID顕微鏡を用いた非破壊評価法の開発
    有野 直樹, SHIOZAWA Daiki, NAKAI Yoshikazu, 福井 弘久
    第84期定時総会講演会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference
    Oral presentation

  • 高温超伝導SQUID 顕微鏡の高分解能化への検討
    福井 弘久, SHIOZAWA Daiki, NAKAI Yoshikazu, 有野 直樹
    関西学生会平成20年度学生員卒業研究発表講演会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の疲労損傷によるマルテンサイト相変態挙動の観察
    真坂 剛史, SHIOZAWA Daiki, NAKAI Yoshikazu, 永島 佳峰
    関西学生会平成20年度学生員卒業研究発表講演会, Mar. 2009, Japanese, 日本機械学会関西支部, 東大阪市, Domestic conference
    Oral presentation

  • 高輝度放射光を利用したμCT法による金属材料中の組織およびき裂の観察
    NAKAI Yoshikazu, SHIOZAWA Daiki
    (社)日本材料学会 第45回X線材料強度に関する討論会, Dec. 2008, Japanese, 日本材料学会, 東京都, Domestic conference
    [Invited]
    Invited oral presentation

  • 放射光を用いたμCTイメージングによるフレッティング疲労き裂の観察
    SHIOZAWA Daiki, NAKAI Yoshikazu, 栗村 隆之, 梶原 堅太郎
    日本材料学会・第29回疲労シンポジウム, Nov. 2008, Japanese, 日本材料学会, 京都市, Domestic conference
    Oral presentation

  • 高輝度放射光マイクロCT法による介在物・疲労き裂・腐食ピットの観察
    Daiki Shiozawa
    SPring-8応力評価実用化研究会及び疲労損傷評価研究会合同研究会, Nov. 2008, Japanese, SPring-8利用推進協議会, 大阪, Domestic conference
    Invited oral presentation

  • 高輝度放射光マイクロCT法による介在物・疲労き裂・腐食ピットの観察
    SHIOZAWA Daiki
    Spring-8応力評価実用化研究会(第17回)及び疲労損傷評価研究会(第6回)合同研究会, Nov. 2008, Japanese, Spring-8利用推進協議会, 大阪市, Domestic conference
    Invited oral presentation

  • 高輝度放射光CT法による腐食疲労ピットおよびき裂の発生と成長の観察
    NAKAI Yoshikazu, SHIOZAWA Daiki
    日本材料学会・第29回疲労シンポジウム, Nov. 2008, Japanese, 日本材料学会, 京都市, Domestic conference
    Oral presentation

  • 高温SQUIDを用いたプリント配線の非破壊欠陥検出
    有野 直樹, SHIOZAWA Daiki, NAKAI Yoshikazu
    M&M2008材料力学カンファレンス, Sep. 2008, Japanese, 日本機械学会, 草津市, Domestic conference
    Oral presentation

  • 高温SQUIDを用いたプリント配線の欠陥検出
    Daiki Shiozawa, Yoshikazu Nakai, 藤本 高志, Naoki Arino
    第4回マイクロマテリアルシンポジウム, Sep. 2008, Japanese, 日本材料学会, 東京, Domestic conference
    Oral presentation

  • オーステナイト系ステンレス鋼の繰返し変形による磁気特性変化に及ぼす応力比の影響
    永島 佳峰, SHIOZAWA Daiki, NAKAI Yoshikazu
    M&M2008材料力学カンファレンス, Sep. 2008, Japanese, 日本機械学会, 草津市, Domestic conference
    Oral presentation

  • SUS30鋼の疲労損傷による磁気特性変化に及ぼす応力比の影響
    SHIOZAWA Daiki, NAKAI Yoshikazu, 永島 佳峰
    日本材料学会第57期通常総会・学術講演会, May 2008, Japanese, 日本材料学会, 鹿児島市, Domestic conference
    Oral presentation

  • Effect of stress ratio on the change of magnetic property by high-cycle fatigue damage in SUS304 steels
    塩澤 大輝, 中井 善一, 永島 佳峰
    電磁力関連のダイナミクスシンポジウム, May 2008, Japanese, 日本AEM学会, 大分市, Domestic conference
    Oral presentation

  • 放射光イメージングによる高強度アルミニウム合金の腐食疲労き裂の観察
    坂本 圭司, 塩澤 大輝, 中井 善一
    関西学生会卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, 豊中, Domestic conference
    Oral presentation

  • SQUIDを用いたプリント配線内欠陥による磁場分布変化の測定
    佐々木 理, 塩澤 大輝, 中井 善一, 藤本 高志
    関西学生会卒業研究発表会, Mar. 2008, Japanese, 日本機械学会, Toyonaka, Domestic conference
    Oral presentation

  • SQUIDを用いたプリント配線の非破壊欠陥検出法の開発
    Takashi Fujimoto, Daiki Shiozawa, Yoshikazu Nakai, Osamu Sasaki
    The 83rd Annual Meetings of JSME-Kansai, Mar. 2008, Japanese, 日本機械学会/The Japan Society of Mechanical Engineers, Toyonaka, Domestic conference
    Oral presentation

  • Observation of martensitic transformation in fatigue by the change in magnetism
    Daiki Shiozawa, Yoshikazu Nakai, Yoshitaka Eijima
    2008 M&M International Symposium for Young Researchers, Mar. 2008, English, Japan Society of Mechanical Engineers, Wakayama, International conference
    Oral presentation

  • 磁気特性変化を用いたSUS04鋼の疲労損傷検出
    Yoshitaka Eijima, Daiki Shiozawa, Yoshikazu Nakai
    Annual Meetings of the Japanese Society of Mechanical Engineers 2007, Sep. 2007, Japanese, 日本機械学会/The Japan Society of Mechanical Engineers, Suita, Domestic conference
    Oral presentation

  • SQUIDを用いた電流内欠陥の非破壊検出
    Takashi Fujimoto, Daiki Shiozawa, Yoshikazu Nakai, Naoki Arino
    Annual Meetings of the Japanese Society of Mechanical Engineers 2007, Sep. 2007, Japanese, 日本機械学会/The Japan Society of Mechanical Engineers, Suita, Domestic conference
    Oral presentation

  • Observation of Inclusions and Defects in Steels by Micro Computed-tomography using Ultrabright Synchrotron Radiation
    Yoshikazu Nakai, Daiki Shiozawa, Yasushi Morikage, Takayuki Kurimura, Hiroshi Tanaka, Hideki Okado, Takuya Miyashita
    Fourth International Conference on Very High Cycle Fatigue, Aug. 2007, English, The Metallurgical Society ofAIME, Ann Arbor, USA, International conference
    Oral presentation

  • SUS304鋼のき裂発生過程における磁気特性変化の観察
    Daiki Shiozawa, Yoshitaka Eijima, Yoshikazu Nakai
    56th Annual Meetings of the Society of Materials Science, Japan, May 2007, Japanese, 日本材料学会, Nagoya, Domestic conference
    Oral presentation

  • Magnetism change in Fatigue Process of SUS304 steel
    Shiozawa Daiki, Eijima Yoshitaka, Nakai Yoshikazu
    第56期材料学会総会, May 2007, Japanese, 日本材料学会, Nagoya, Domestic conference
    Oral presentation

  • SPring-8のマイクロトモグラフィによる鋼中の介在物および欠陥観察
    Shiozawa Daiki, Nakai Yoshikazu, Morikage Yasushi, Tanaka Hiroshi, Miyashita Takuya, Kurimura Takayuki, Okado Hideki
    第28回疲労シンポジウム, Nov. 2006, Japanese, 日本材料学会, 名古屋市, Domestic conference
    Oral presentation

  • 高輝度放射光のμ-X線CTイメージングを用いた高強度鋼中の介在物およびき裂の定量的評価
    Shiozawa Daiki, Nakai Yoshikazu, Morikage Yasushi, Tanaka Hiroshi, Miyashita Takuya, Okado Hideki
    第3回マイクロマテリアルシンポジウム, Sep. 2006, Japanese, 日本材料学会, 同志社大学・京都, Domestic conference
    Oral presentation

  • SUS304鋼における疲労過程の磁気特性変化を用いた疲労損傷評価
    Shiozawa Daiki, Nakai Yoshikazu, Yokota Masaki, Teramoto Nobuhiro
    2006年度日本機械学会年次大会, Sep. 2006, Japanese, 日本機械学会, 熊本大学・熊本, Domestic conference
    Oral presentation

  • Quantitative Analysis of Inclusions and Fatigue Cracks in Steel by X-ray Computed Tomography Using Ultra-bright Synchrotron Radiation
    Yoshikazu Nakai, Daiki Shiozawa, Hiroshi Tanaka, Yasushi Morikage, Hideki Okado, Takuya Miyashita
    2nd Workshop on New Methods of Damage and Failure Analysis of Structural Parts, Sep. 2006, English, Technical University of Ostrava, Technical University of Ostrava, Czech, International conference
    Invited oral presentation

  • SUS304鋼における疲労過程の磁気特性変化
    Shiozawa Daiki, Nakai Yoshikazu, 横田 真樹
    第55期材料学会総会, May 2006, Japanese, 日本材料学会, 長岡技術科学大学, Domestic conference
    Oral presentation

  • Observation of fatigue damage in SUS304 steel by scanning magnetic force microscopy
    SHIOZAWA Daiki, NAKAI Yoshikazu, YOKOTA Masaki
    第54期材料学会総会学術講演会, May 2005, Japanese, 日本材料学会, 仙台市民会館, Domestic conference
    Oral presentation

  • 受動型電気ポテンシャルCT法によるき裂同定および欠陥モニタリング
    塩澤 大輝, 久保 司郎, 阪上 隆英
    M&M信州スプリングシンポジウム, Mar. 2005, Japanese, 未記入, 未記入, Domestic conference
    Oral presentation

  • 受動型電気ポテンシャルCT法による複合材内はく離状欠陥の同定およびモニタリング
    塩澤 大輝, 久保 司郎, 阪上 隆英, 岡崎 俊介, 中谷 健作
    第3回評価・診断に関するシンポジウム, 2005, Japanese, 未記入, 未記入, Domestic conference
    Oral presentation

  • 受動型電気ポテンシャルCT法によるき裂同定
    塩澤 大輝, 久保 司郎, 阪上 隆英
    日本機械学会関西支部材力談話会, 2005, Japanese, 未記入, 未記入, Domestic conference
    Oral presentation

  • 圧電弾性練成問題の境界要素逆解析によるピエゾ材料を用いた接触圧力分布の推定
    塩澤 大輝, 久保 司郎, 阪上 隆英
    M&M2004材料力学カンファレンス, 2005, Japanese, 未記入, 未記入, Domestic conference
    Oral presentation

■ Affiliated Academic Society
  • 土木学会

  • 非破壊検査協会

  • 日本材料学会

  • 日本機械学会

■ Research Themes
  • Development of a 5D (3D + time series + hyperspectral) gas visualization technique based on infrared CT method
    阪上 隆英, 小川 裕樹, 塩澤 大輝
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2024 - 31 Mar. 2027

  • 4次元的損傷分散概念に基づく多機能ヘテロ金属創製原理の創発
    菊池 将一, 塩澤 大輝, 藤井 朋之, 蓮沼 将太, 關根 惟敏
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 静岡大学, 01 Apr. 2022 - 31 Mar. 2025

  • 防食塗装の経年劣化を遠隔から定量評価できる目視を超越した赤外分光計測法の創生
    阪上 隆英, 久保 司郎, 小川 裕樹, 塩澤 大輝, 赤井 淳嗣
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, 01 Apr. 2021 - 31 Mar. 2024
    橋梁，石油タンク，配管等のインフラ構造物の長寿命化ならびにライフサイクルコストの削減には，予防保全の導入が不可欠である．鋼構造物の腐食に対する予防保全での最重要課題は，限られたリソースの下で，鋼構造物の腐食に対する予防保全を実施するため，重防食塗装の劣化を早期に遠隔から非接触・非破壊で，効率的かつ高精度に検知するとともに，劣化進行度を定量的に評価できる非破壊評価法を開発することである．そこで，本研究では，重防食塗装膜が有する赤外光の分光反射・吸収・透過特性に着目し，赤外線カメラを用いた分光画像計測ならびに分光特性に基づくマルチスペクトル逆問題解析に基づき，遠隔から構造物の重防食塗装の早期劣化を定量的に評価できる計測法を開発する．2021年度は，そのためのハードウエアの製作ならびに塗装膜の赤外線計測に関する基礎検討を行った． まず，計測に用いるハードウエアとして，対象物の分光特性を画像化できる赤外分光画像計測装置を近赤外線カメラを基礎に試作した．また，塗膜劣化試験体に対して，太陽光を用いるパッシブ計測および照明光を用いるアクティブ計測により，塗膜劣化部位の検出および塗膜の残存厚さの定量評価を試行した．その際の計測精度の向上を目的として，一定周期で変動する照明の下での近赤外線強度変動データをロックイン計測する，アクティブロックイン計測法を開発した．さらに，アクティブロックイン計測法の有用性を実験室レベルでの試験体を用いた計測，ならびに実鋼橋梁での現場計測を通じて実験的に検証した．

  • Clarification of innovative deformation mechanism in harmonic structure materials and creation of design principle for structure materials for next generation
    飴山 惠, 藤原 弘, 伊藤 隆基, 山末 英嗣, 下川 智嗣, 中井 善一, 塩澤 大輝, 菊池 将一, 川畑 美絵, 上野 明
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (S), Ritsumeikan University, 11 Jun. 2018 - 31 Mar. 2023
    社会基盤の骨格とも言える構造用金属材料には、高い強度と大きな延性が同時に要求される。しかし、“Considere's criterion”が19世紀の終わりに発表されて以来、金属材料の強度と延性は理論上、両立しない性質であり、両者は二律背反であることが常識とされてきた。 これに対し、研究代表者は「調和組織材料」の創製に成功し、調和組織材料が高強度と高延性を両立する普遍的な性質を有することを示した。そして、調和組織材料の研究を進める中で、通常の均一材料には見られない様々な特異現象が見つかった。本研究では、多彩な学術分野の研究者が結集し、ミクロからマクロに拡がる転位／粒界／周期構造の関連性を系統的に明らかにすることを目指し、調和組織材料の「高強度と高延性・高靱性の両立」をはじめとする様々な特異な力学特性を、大型放射光施設や最先端の力学特性・組織解析手法を駆使して解明しつつある。 これまでの特筆すべき成果として、「シナジー硬化現象」や「新たな延性発現機構」を見出した。「シナジー硬化(Synergy Extra Hardening)」は、従来のHall-Petch関係に依らない、特異な強度上昇が見られる現象である。また、「新たな延性発現機構」とは、強度が上昇すれば全伸びに占める局部伸びが低下する、という従来常識に反して、高強度化しても局部伸びは低下せず、その結果、高延性に結びつく現象で、加工硬化の増大による延性増加とは異なる、新しい延性発現機構である。「降伏とは何か?」、「延性とは何か?」という学術的に意義深い問いを改めて突きつける成果が得られた。これまでの材料科学の知識・常識を打ち破るパラダイムシフトが期待できる成果である。

  • 4D evaluation of damage in hetero-structured materials with high performance by multi-scale measurement
    Kikuchi Shoichi
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Shizuoka University, 01 Apr. 2019 - 31 Mar. 2022
    Metallic materials having a heterogeneous structure (HS), which consists of a coarse-grained structure surrounded by a network structure of fine equiaxed grains, were fabricated to achieve high strength and ductility. 4D evaluation of damage was conducted for the HS materials with high performance by multi-scale measurement. The fatigue limit was increased by the HS design due to the grain refinement. To improve their fatigue properties, thermomechanical processing (TMP) was performed. The average size of the grains in the fine-grained structures was preferentially decreased by TMP. Applying TMP to CP titanium having a HS increased its fatigue life due to greater resistance to the initiation of fatigue crack as a result of grain refinement. In contrast, the crack growth rates for the HS material for long cracks were constantly higher, and its threshold stress intensity range were lower compared to a material with a homogenous coarse-grained structure.

  • 中井 善一
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2018 - Mar. 2021
    電子後方散乱回折(EBSD)解析により双晶帯発生，双晶帯消滅，および疲労き裂発生のメカニズムを解明するため，底面が負荷方向に平行(c-軸が表面に垂直)な集合組織をもった試験片と結晶方位がランダムなマグネシウム合金AZ31伸展材より作成した試験片を用いて，引張-圧縮-引張，圧縮-引張-圧縮-引張-圧縮，圧縮- 圧縮の三種類の繰り返し応力を適用した．その結果，集合組織材では，引張応力下では双晶帯は発生しなかったが，圧縮応力下では双晶帯が発生することをEBSD 観察によって確かめた．また，圧縮応力下で発生した双晶帯は，引張応力下で全て消滅した．再度圧縮応力を負荷したところ，最初の圧縮負荷によって双晶帯が 発生したのと同じ場所に再度双晶帯が発生するもの，最初の圧縮負荷によって双晶帯が発生した場所に二回目の圧縮負荷では双晶帯が発生しないもの，最初の圧 縮負荷によって双晶帯が発生しなかった場所に二回目の圧縮負荷では双晶帯が発生したものがあることが分かった．したがって，双晶帯とその消滅は完全には可 逆的ではなく，不可逆なものもあることが分かった．一方，結晶方位がランダムな場合，引張応力下，圧縮応力下のいずれでも双晶帯が発生した．また，この場 合，圧縮応力下で発生した双晶帯は，後続の引張負荷によって消滅しなかった．また，双晶消滅の生じない圧縮-圧縮の繰返し負荷を多数回繰り返した場合，底 面の法線(c-軸)が負荷軸方向に揃った集合組織に変化した．
    Competitive research funding

  • 阪上 隆英
    科学研究費補助金／基盤研究(B), Apr. 2018 - Mar. 2021
    Competitive research funding

  • 塩澤 大輝
    科学研究費補助金／基盤研究(B), Apr. 2017 - Mar. 2020, Principal investigator
    Competitive research funding

  • 阪上 隆英
    学術研究助成基金助成金／挑戦的萌芽研究, Apr. 2016 - Mar. 2018
    Competitive research funding

  • 阪上 隆英
    科学研究費補助金／基盤研究(B), Apr. 2014 - Mar. 2017
    Competitive research funding

  • 中井 善一
    科学研究費補助金／基盤研究(B), Apr. 2014 - Mar. 2017
    Competitive research funding

  • 塩澤 大輝
    学術研究助成基金助成金／基盤研究(C), Apr. 2013 - Mar. 2016, Principal investigator
    Competitive research funding

  • Visualization of interior originating small cracks in high strength titanium alloy and the clarification of very high cycle fatigue mechanisms
    NAKAMURA Takashi, SHIBAYAMA Tamaki, SHIOZAWA Daiki, NAKAI Yoshikazu, UESUGI Kentarou
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Hokkaido University, 01 Apr. 2012 - 31 Mar. 2015
    Observations of internal fatigue cracks in Ti alloy were made by using synchrotron radiation micro CT imaging in the large synchrotron radiation facility (SPring-8) .Uniaxial fatigue tests were repeated on the specimen over 1.0E7 cycles, and the growth of the internal fatigue crack was measured by micro CT imaging. To investigate the effects of the environment around internal fatigue crack on crack growth process, the relationship between da/dN and stress intensity factor range were compared with that of surface cracks in vacuum environment. As a result, internal fatigue crack propagated quite slowly at a rate below 1.0E-10m/cycle. However, the fatigue crack advanced rapidly at a rate of around 1.0E-7m/cycle after reaching at the surface of specimen. Crack growth rate of internal crack agreed quite well with that of surface crack in vacuum. Therefore, vacuum-like environment around internal crack has an important role of fatigue crack process in the very high cycle regime.

  • SHIOZAWA Daiki
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Kobe University, 2010 - 2012, Principal investigator
    The three dimensional grain mapping technique for polycrystalline material, that is termed X-ray diffraction contrast tomography (DCT) has proposed. In the present study, the measurements of DCT were conducted in SPring-8 and the condition of measurement and data procedure were discussed. Developed technique was applied to aluminum alloy and stainless steel. It was found that the shape and location of grain can be determined by three-dimensional mapping technique using the apparatus in SPring-8, BL19B2 bending beam line. Next, for evaluation of plastic deformation, the internal grain orientation spread of the individual grain was counted. The grain orientation spread is caused by the mosaicity, which related to the change of microstructure. The grain orientation spread increased with increasing in the tension stress in the plastic deformation region and cyclic loading. It is possible to evaluate fatigue damage in microstructure, such as crack initiation and creep damage, by the DCT technique and using the grain orientation spread as one of the fatigue damage parameters
    Competitive research funding

  • 中井 善一
    科学研究費補助金／基盤研究(B), 2011
    Competitive research funding

  • 阪上 隆英
    科学研究費補助金／基盤研究(B), 2011
    Competitive research funding

  • Development and Evaluation of Nano-Fiber Reinforced Light Curing Resin Composites Fabricated by Micro Stereolithography
    TANAKA Hiroshi, SHIOZAWA Daiki
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 2008 - 2010
    In the present study, nano-fiber reinforced light curing resin composites was development by two-photon-absorption micro stereolithography with blue-violet laser. The present method enabled the fabrication of composites with at least 10 mass% nano-fiber, while the upper limit of nano-fiber content fabricated by a conventional UV-curing micro stereolithography was about 1 mass%. Tensile strength of composites takes a maximum at the nano-fiber content of 5 mass% and was two times larger than that of unreinforced resin.

  • YOSHIKAZU Nakai, HIROSHI TANAKA, CHIAKI HIWA, DAIKI SHIOZAWA
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 2008 - 2010
    Ultra-fine grain α-brass with average grain size of 1.0μm was successfully obtained by repetitive rolling and heat-treatment. Hall-Petch relationships were found between the strengths and the grain size, and then the strengths of the ultra-fine grain material were extremely higher than that of conven-tional materials. Tensile tests and fatigue tests of thin wires of commercially pure iron were conducted. With decreasing the diameter of specimen, the yield phenomenon was disappeared and the fatigue be-havior of the thin wire was strongly dependent on the yielding. Fatigue tests of Zr-based metallic glass (BMG) were also conducted, and found that the BMG plate had inhomogeneity in the thickness direc-tion, where the strength was highest at the surface, and it was lowest in the midsection. The fatigue strength of the BMG was very sensitive to notch.
    Competitive research funding

  • SHIOZAWA Daiki
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Kobe University, 2008 - 2009, Principal investigator
    For development of nondestructive fatigue damage evaluation using magnetic measurement, martensitic volume fraction in fatigue damage process was measured by the ferrite scope, and leakage magnetic flux density caused by martensitic phase was measured by the MI sensor, which was high sensitive magnetic sensor. It was found that the martensitic volume fraction changed corresponding to the plastic strain range. This result shows that the fatigue damage can be estimated from the measurement of martensitic volume fraction. For sensitive detection of the change in martensitic phase, SQUID microscope was developed. Synchrotron radiation ・CT imaging was developed to observe the crack initiation and the propagation behavior of small crack.
    Competitive research funding

  • TANAKA Hiroshi, NAKAI Yoshikazu, SHIOZAWA Daiki
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 2006 - 2007
    This research was conducted for the purpose of clarifying the effect of hydrogen environment on fracture strength and cyclic shape memory deformation of TiNi thin film microactuators. Two kinds of TiNi thin film microactuators with a thickness of 4〜16 μm fabricated by the roll-bonding method and sputtering method were used in this research. Hydrogen charging was conducted by cathodic electrolysis using an acid solution. Hydrogen content increased with increasing charging time and saturated at about 2000 mass ppm. When compared at the same charging time, hydrogen content was larger for thinner film. For both kinds of TiNi thin film microactuators, delayed fracture strength of hydrogen-charged microactuators measured by the SSRT method using a developed micromaterial testing system decreased as the charging time increased and the film thickness got smaller. These results show that delayed fracture strength depends on the hydrogen content in TiNi thin film microactuators. The cyclic shape memory deformation tests were carried out in the hydrogen-charging environment. The recovery stress and strain recovery rate markedly decreased by hydrogen charging. Fatigue tests in the hydrogen-charging environment were also conducted. The obtained S-N curves (the relationship between the stress amplitude and number of cycles to failure) showed shorter fatigue life for lower stress frequency. The relationship between the maximum stress and time to rupture was independent of the stress frequency. This result means that the fatigue fracture of TiNi thin films in hydrogen environment is time-dependent fracture. Also, in this research, TiNi wire-reinforced composite actuators were developed and evaluated as a high-power actuator with small-size TiNi shape memory alloys
    Competitive research funding

  • 塩澤 大輝
    日本学術振興会, 科学研究費補助金／若手研究(B), 若手研究(B), 神戸大学, 2006 - 2007, Principal investigator
    1.SUS304鋼における疲労過程の漏洩磁界分布の観察 疲労過程における磁気特性変化を調べるために,SUS304鋼についての平面曲げ疲労試験を行い,漏洩磁界分布の変化を観察した.平成18年度では両振り(R=-1)で実験を行った.平成19年度では応力比を変化させて疲労試験を行い,応力比による影響を検討した結果,次のような知見を得た.(1)応力比R=-0.5の場合においてもR=-1の場合と同様に,負荷繰返し数の増加と伴に応力集中部において漏洩磁界の増加または減少が観察された.(2)疲労過程における繰返し変形によるマルテンサイト変態への影響を調べるために,ひずみゲージを用いてひずみ幅の変化を測定したところ,ひずみ幅の増加および減少と磁界変化率の変化に対応関係が見られた.(3)R=-1の場合と比較して,R=-0.5の場合における疲労過程初期段階の漏洩磁界の変化は小さい. ひずみ変化と磁気特性変化に対応関係が見られることから,疲労過程における加工硬化および加工軟化などの組織変化を磁気特性変化により評価できる可能性があることがわかった. 2.SQUIDを用いた磁界分布の測定 SQUID(超伝導量子干渉素子)は,地磁気の5000万分の1以下の磁界を検出できる高感度磁気センサであり,従来の磁気センサでは検出できなかった欠陥による微小な磁界変化を捉えることが出来る可能性がある.本研究では,SQUIDを用いた計測システムを構築し,その動作特性について検討を行った.その結果,SQUIDを用いて得られた200μm幅の電流路およびそのなかの欠陥の影響による磁界変化を検出できることがわかった.SQUIDを用いれば,高感度かつ高分解能でSUS304鋼内の磁性相を検出できると考えられる.
    Competitive research funding

  • リアルタイム・ヘルスモニタリングのためのパッシブ電気ポテンシャルCT法の開発
    塩澤 大輝
    日本学術振興会, 科学研究費助成事業, 特別研究員奨励費, 神戸大学, 2004 - 2004
    得られた研究実績を以下に示す. 1.圧電弾性連成問題の境界要素解析プログラムの作成 ピエゾ効果による三次元弾性場・三次元電気ポテンシャル場の連成解析のための境界要素解析プログラムを新たに作成した.境界要素解析プログラムによれば,有限要素解析と比較して,少ない節点で精度良く電気ポテンシャル場を計算することができ,複雑な形状の対象に関する電気ポテンシャル分布を精度良く解析できる可能性があることが確認できた.本解析プログラムを用いて接触圧力分布の推定を行った.ピエゾ材料では,電気的な境界値と機械的な境界値が連成しているため,電気的な情報から変位または表面力などの機械的な情報を逆問題的に推定できるものと考えられる.電気ポテンシャル分布から計測面の背面における接触圧力分布を推定する数値シミュレーションを行ったところ,接触圧力分布の推定が可能であることがわかった. 2.炭素繊維強化複合材内のはく離状欠陥の同定に関する実験的検討 炭素繊維強化複合材(三菱重工業製)の内部に人工はく離状欠陥を導入し,この試験体に対してはく離状欠陥の同定を試みた.試験体にピエゾフィルムを貼り付け,3点曲げ変形を与えた場合に,ピエゾフィルム上の電気ポテンシャル分布は,はく離先端の存在領域において特徴的な変化を示した.はく離の層間深さを変化させた3種類の試験体(測定面から板厚比1/4,1/2および3/4の層間深さ)についてそれぞれ同様の実験を行った.その結果,はく離の層間深さに応じてポテンシャル分布傾向が変化することが確認された. 逆問題解析を適用して,測定結果からはく離の寸法および位置の推定を試みた.その結果,はく離の寸法および位置,すなわち損傷領域は精度良く推定できることがわかった.はく離の層間深さに関しては,測定面から近いか,板厚中央より深いかの大まかな層間深さの推定が可能であることがわかった.

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