Research activity information

• Apr. 2012 日本材料学会, 日本材料学会関西支部支部長賞, 日本材料学会関西支部の発展ならびに材料学の教育研究活動への大きな貢献

  FUJIMOTO TAKEHIRO

  Japan society


• Aug. 2011 日本実験力学会, 日本実験力学会技術賞, 論文「定常温度場のインテリジェントハイブリッド計測法に関する基礎研究」

  西岡 俊久, FUJIMOTO TAKEHIRO

  Japan society


• Jun. 2011 日本材料学会, 日本材料学会衝撃部門委員会奨励賞, 衝撃、動的非線形破壊の数値シミュレーションにおける世界的業績

  FUJIMOTO TAKEHIRO

  Japan society


• Jul. 2009 日本計算力学連合, The JACM Award for Young Investigators in Computational Mechanics, 非線形衝撃破壊の数値シミュレーションにおける世界的研究業績

  FUJIMOTO TAKEHIRO

  International society


• May 2003 日本材料学会, 日本材料学会論文賞, 動的分岐破壊の数値シミュレーションによる研究

  NISHIOKA TOSHIHISA, Chouikov Stanislav, FUJIMOTO TAKEHIRO

  Japan society


• Mar. 1992 日本機械学会, 日本機械学会畠山賞, 学科成績

  FUJIMOTO TAKEHIRO

  学生時、学科成績首席によるもの

  Others

• Experimental Observation and Numerical Simulation for Dynamic Fracture by Projectile Collision

  Fujimoto, T, Wang, F, Yasufuku, H

  Lead, Dec. 2020, JSCES, COMPSAFE2020, MS03-3-02, English


• 固体間衝突における各種衝撃偏心荷重下のき裂進展挙動の実験評価

  安福弘規, 藤本岳洋

  Mar. 2020, 日本機械学会講演論文集NO.204-1, 316, Japanese

  Symposium


• 溶接継手付着板材のき裂進展挙動に関する移動有限要素解析

  横川文吾, 藤本岳洋

  Mar. 2020, 日本機械学会講演論文集NO.204-1, 302, Japanese

  Symposium


• 実験・数値解析を用いた動的破壊挙動の衝突仕様依存性の考察

  井上健一郎, 安福弘規, 藤本岳洋

  Last, Mar. 2020, 日本機械学会講演論文集NO.204-1, 311, Japanese

  Symposium


• 被衝突体特異形状端からの強衝撃波発生機構の考察

  塚本健太, 藤本岳洋

  Mar. 2020, 2019年度衝撃波シンポジウム, 1A3-1, Japanese

  Symposium


• 衝突下の三点曲げぜい性金属破壊の数値シミュレーション

  王 芳怡, 安福弘規, 藤本岳洋

  Last, Sep. 2019, 第 32 回計算力学講演会（CMD2019） 講演論文集, 137, Japanese

  Symposium


• シャルピー衝撃破壊の三次元移動有限要素解析

  林 湧也, 藤本岳洋

  Sep. 2019, 第 32 回計算力学講演会（CMD2019） 講演論文集, 155, Japanese

  Symposium


• ストップホール法・締付法による疲労き裂抑止効果の有限要素解析

  船田遼太, 横田久弥, 藤本岳洋

  Last, May 2019, 計算工学講演会論文集, 24, D-04-04, Japanese

  Symposium


• 曲進成長する疲労き裂問題に対する混合形数値シミュレーション

  星田吉輝, 吉田昇生, 横田久弥, 藤本岳洋

  Last, May 2019, 計算工学講演会論文集, 24, D-05-04, Japanese

  Symposium


• 複雑な混合モード下の破壊力学パラメータ評価に関する研究

  岸田強志, 藤本岳洋

  Nov. 2018, 第 31 回計算力学講演会（CMD2018） 講演論文集, U00048, Japanese

  Symposium


• き裂先端のストップホール施工とその近傍への面外応力作用による疲労き裂成長抑止効果の解明（数値解析による考察）

  川田勇介, 横田久弥, 藤本岳洋

  Last, Oct. 2017, 日本機械学会M&M2017 材料力学カンファレンス 講演論文集, OS0509, Japanese

  Symposium


• き裂先端のストップホール施工とその近傍への面外応力作用による疲労き裂成長抑止効果の解明(実験による考察)

  横田久弥, 川田勇介, 藤本岳洋

  Last, Oct. 2017, 日本機械学会M&M2017 材料力学カンファレンス 講演論文集, OS0510, Japanese

  Symposium


• 衝突条件が後続のき裂進展挙動に及ぼす影響の考察

  石川貴大, 藤本岳洋

  Sep. 2017, 第30 回計算力学講演会講演論文集, 203, Japanese

  Symposium


• Numerical analyses for fracture resistance under some impact fracture

  藤本岳洋, 石橋正晃

  Lead, Sep. 2017, 第30 回計算力学講演会講演論文集, 188, Japanese

  Symposium


• 傾斜衝突下の予き裂三点曲げ破壊試験片のき裂進展挙動解析

  石川貴大, 藤本岳洋

  Oct. 2016, 日本機械学会M&M2016材料力学カンファレンス講演論文集, 888 - 890, Japanese

  Symposium


• 衝撃試験と数値解析を用いた破壊じん性評価法に関する研究

  石橋正晃, 藤本岳洋, 松山靖典

  Oct. 2016, 日本機械学会M&M2016材料力学カンファレンス講演論文集, 885 - 887, Japanese

  Symposium


• 衝突体中の動的破壊における打撃端形状依存性に関する研究

  石川貴大, 小椋隆寛, 藤本岳洋

  Last, Sep. 2016, 第29回計算力学講演会CD-ROM論文集, 086, Japanese

  Symposium


• 疲労き裂成長抑止・緩和法に関する数値シミュレーション

  藤本岳洋, 島田光平

  Lead, Sep. 2016, 第29回計算力学講演会CD-ROM論文集, 125, Japanese

  Symposium


• 数値解析による混合モード作用下疲労き裂成長の応力拡大係数評価

  髙橋明生, 藤本岳洋

  May 2016, 計算工学講演会論文集, 21, Japanese

  Symposium


• き裂進展経路予測理論によるぜい性材破壊挙動の評価

  三石 学, 藤本岳洋

  May 2016, 計算工学講演会論文集, 21, Japanese

  Symposium


• ストップホールによる疲労き裂成長抑止効果の力学的評価

  横尾和磨, 藤本岳洋

  Nov. 2015, M&M2015 材料力学カンファレンス論文集, 178, Japanese

  Symposium


• 様々な初期切り欠き径からの後続破壊挙動に関する3次元有限要素解析

  岡田晃明, 柏原一仁, 藤本岳洋

  Last, Oct. 2015, 第28回計算力学講演会CD-ROM論文集, 063, Japanese

  Symposium


• 鋳鉄破壊挙動の衝突依存性評価の移動有限要素解析

  笠見諒介, 曺 圭春, 藤本岳洋

  Last, Oct. 2015, 第28回計算力学講演会CD-ROM論文集, 129, Japanese

  Symposium


• 衝撃三点曲げ下の切り欠き端破壊挙動に関する弾塑性移動有限要素解析

  藤本岳洋, 柏原一仁, 岡田晃明

  Lead, Oct. 2015, 第28回計算力学講演会CD-ROM論文集, 281, Japanese

  Symposium


• 3次元移動有限要素法を用いた鋳鉄材の動的破壊経路評価

  小椋隆寛, 曺 圭春, 藤本岳洋

  Last, Jun. 2015, 計算工学講演会論文集, 20, 100042, Japanese

  Symposium


• 衝突時の接触・非接触及び衝突材・衝突形状を考慮した金属ぜい性破壊挙動の移動有限要素解析

  笠見諒介, 曺 圭春, 藤本岳洋

  Last, Jun. 2015, 計算工学講演会論文集, 20, 100043, Japanese

  Symposium


• Experimental and Numerical Study on the Dynamic Fracture Characteristics of Grey Cast Iron FC200

  Kyuchun Cho,Chikara Simozono,Takehiro Fujimoto,Toshihisa Nishioka

  Jun. 2014, Applied Mechanics and Materials, 566, 274 - 280, English

  [Refereed]

  Scientific journal


• 混合モード下の疲労破壊挙動の三次元移動有限要素解析

  仲出知宏, 藤本岳洋

  Last, Jun. 2014, 計算工学講演会論文集, 19(D-8-3) (D-8-3), Japanese

  Symposium


• 疲労き裂成長抑制のためストップホール設定に関する数値解析

  周 馳, 横尾 和磨, 藤本 岳洋

  Last, Jun. 2014, 計算工学講演会論文集, 19(D-8-4) (D-8-4), Japanese

  Symposium


• Evaluation of Fatigue Crack Growth Characteristics about Mixed Mode Influence and Thickness Dependence Using the Three-point Bending Specimens

  LEE HOYEON, FUJIMOTO TAKEHIRO

  Many industrial structures are worked under complex load. Some irregular load causes cracks or defects in the structure. Then fatigue crack growth from these initial crack is appeared under mixed mode. These crack tip condition translates to mode I domination by crack growth. Because general fatigue crack growth is progressed under mode I domination, mode I fatigue crack growth

  日本実験力学会, Mar. 2014, 実験力学, 14(1) (1), 34 - 39, Japanese

  [Refereed]

  Scientific journal


• Ultra high-speed photography and moving finite element analysis for dynamic crack branching under impact loading

  Toshihisa Nishioka, Yuta Negishi, Hijiri Sumii, Takehiro Fujimoto

  日本材料力学会, Nov. 2012, Zairyo/Journal of the Society of Materials Science, Japan, 61(11) (11), 894 - 899, Japanese

  [Refereed]

  Scientific journal


• 表面き裂の疲労成長におよぼす材料熱処理および複数き裂干渉効果に関する研究

  李浩淵, 藤本岳洋, 元瑛晙, 西岡俊久

  Oct. 2012, 日本機械学会第25回計算力学講演会CD-ROM論文集, 1903, Japanese

  Symposium


• デローニ自動要素分割を用いた曲線前縁き裂進展の3次元移動有限要素解析

  松原仁志, 藤本岳洋, 西岡俊久

  Oct. 2012, 日本機械学会第25回計算力学講演会CD-ROM論文集, 1902, Japanese

  Symposium


• Evaluation of Fatigue Crack Growth Behavior in Materials with Lubricating Oil Holes

  NISHIOKA Toshihisa, LEE Hoyeon, WON Youngjun, FUJIMOTO Takehiro

  In engineering applications, fractures occur mostly from surface or internal three-dimensional cracks due to defects already existing in the material. These generally propagate in all directions and often have irregular shapes, and are not limited only to metallurgical defects but also include those which are due to the fastening of parts, configuration design, as well as those that result from the need to provide lubrication of ships and offshore structures. Since these generate a stress concentration zone, fatigue crack initiation and propagation are strongly affected. However, these are inevitable in design. Therefore, a study on the characteristics of fatigue crack growth that occur when surface cracks initiated from initial defects propagate into stress concentration zones such as those in lubricating oil holes of connecting rods was conducted.

  The Japan Institute of Marine Engineering, Sep. 2012, JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN, 47(5) (5), 723 - 728, Japanese


• Study on Thermal Stress-Induced Brittle Fracture of Cast Iron

  IKENISHI KENJI, NISHIOKA TOSHIHISA, FUJIMOTO TAKEHIRO, KOMARU YUKITO, TSURU HIDETO

  Cast iron is used as material for motor and pump casings due to its superior casting characteristics. In addition, it is used for cylinder liners and pistons exposed to high temperatures because its strength does not deteriorate even at high temperature conditions. For parts made of cast iron, examples of brittle fracture damage induced by thermal stress are reported. However,

  日本マリンエンジニアリング学会, Mar. 2012, マリンエンジニアリング学会誌, 47(2) (2), 133 - 138, English

  [Refereed]

  Scientific journal


• Ultra-High-Speed Observation of Cutting of Failure Phenomenon in Thin Metallic Lamina by Punch and Measurement of Displacements by Digital Image Correlation Method

  NISHIOKA TOSHIHISA, IWAWAKI TAKASHI, FUJIMOTO TAKEHIRO, KASHIWARA YOSHIYUKI

  Machine components of industrial products are often produced by press cutting. However, the mechanism of cutting (ductile fracture of metals) is not perfectly understood. In order to clarify this mechanism, cutting processes were observed by an ultrahigh-speed camera. The ultrahigh-speed camera is capable of recording maximum record rate 1,000,000 frames per second (preserved i

  The Japan Society of Mechanical Engineers, 2012, Journal of Solid Mechanics and Materials Engineering, 6(6) (6), 565 - 573, English

  [Refereed]

  Scientific journal


• Evaluation of Interacting Semi-elliptical Surface Cracks of Mechanical Structural Components Using VNA Solution Finite Element Alternating Method*

  Nishioka. T, Nogami, T, Fujimoto, T

  Last, Sep. 2011, Proceedings of ATEM’11, OS12F078, English

  International conference proceedings


• Verification of the Combination Rules of Multiple Flaws in ASME B&PV Code Section XI: A Case Study of Two Adjacent Surface Planar Flaws

  NISHIOKA TOSHIHISA, ZHOU GUANGQIN, FUJIMOTO TAKEHIRO

  2011, The Journal of Pressure Vessel Technology, 133(2) (2), 021101 - 1-5, English

  [Refereed]

  Scientific journal


• Moving finite element analyses of fracture path prediction for stress corrosion cracking

  Toshihisa Nishioka, Hayato Niwa, Takehiro Fujimoto

  日本材料学会, Dec. 2010, Zairyo/Journal of the Society of Materials Science, Japan, 59(12) (12), 950 - 955, Japanese

  [Refereed]

  Scientific journal


• Moving Finite Element Analysis for Fracture Behavior Including Contact Effects on Initial Crack Surface under Higher Eccentric Impact Loading

  NISHIOKA TOSHIHISA, FUJIOKA TAKANORI, FUJIMOTO TAKEHIRO

  Crack propagation path prediction is very important to prevent critical industrial accidents. However it is considered that the crack propagation path prediction is very difficult in occasion of High Eccentric Impact Loading. In this study, dynamic fracture path prediction under eccentric load that assumed the heavier mixed mode dynamic fracture was simulated by Moving Finite E

  日本機械学会, Nov. 2010, 日本機械学会論文集（A編）, 76(771) (771), 1390 - 1396, Japanese

  [Refereed]

  Scientific journal


• Strength Evaluation of Marine Crane Hooks by Static-load and Fatigue Experiments

  NISHIOKA TOSHIHISA, LEE HOYEON, WON YOUNGJUN, FUJIMOTO TAKEHIRO

  It is very important to evaluate the strength of marine hooks in order to prevent accidents. Thus, the authors studied the strength of marine crane hooks, which are widely used for marine cargo handling, by static-load and fatigue experiments. From the results of static load and cyclic load tests, it was confirmed that the strength of the crane hook was more sensitive to diamet

  日本マリンエンジニアリング学会, Nov. 2010, 日本マリンエンジニアリング学会誌, 45(増刊号) (増刊号), 91 - 96, English

  [Refereed]

  Scientific journal


• Moving finite element analyses for fast crack propagation in sheet metal

  T. Fujimoto, T. Nishioka

  Feb. 2010, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 52(2) (2), 277 - 286, English

  [Refereed]

  Scientific journal


• Pure research into hall (crack arrester) for brittleness high speed destruction stop -The first report Basic experiment that uses C.G.S method and ultra high speed video camera-

  NISHIOKA Toshihisa, OOYA Takashi, GOAMI Keisuke, FUJIMOTO Takehiro, OKAMOTO Goro

  日本実験力学会, 2010, The Japanese Society for Experimental Mechanics, Vol 10, No. 1, pp. 69-73(1) (1), 69 - 73, Japanese

  [Refereed]

  Scientific journal


• Validation analyses on the Combination Rules of Multiple Flaws in ASME Boiler and Pressure Vessel Code Section XI. Case of Two Adjacent Surface Planar Flaws (Surface Flaw #1)

  NISHIOKA Toshihisa, ZHOU Guangqin, FUJIMOTO Takehiro

  2010, ASME, The Journal of Pressure Vessel Technology, in production, English

  [Refereed]

  Scientific journal


• Moving finite element analyses for fast crack propagation in sheet metal structure

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2010, International Journal of Mechanical Sciences, Vol 52, Issue 2, pp. 277-286, English

  [Refereed]

  Scientific journal


• Experimental and numerical study for crack propagation in aluminum alloy A2024-T351

  FUJIMOTO TAKEHIRO, NISHIOKA TOSHIHISA

  In some catastrophic structural accidents, impact loading causes metal failure and fracture. High impact loads cause fast crack propagation, and distinct plastic deformations can be observed around the crack propagation path. The fracture behavior depends on the material ductility, loading velocity, and various other factors. Therefore, the mechanism of dynamic ductile fracture

  IOP Publishing, 2010, IOP Conf. Series: Materials Science and Engineering 10, English

  [Refereed]

  International conference proceedings


• Development of three-dimensional moving finite element method based on Delaunay automatic tetrahedronization

  NISHIOKA TOSHIHISA, HAMANAKA KEIJI, OTSUKA TETSUYA, FUJIMOTO TAKEHIRO

  Up to now, it has been impossible to simulate dynamic crack propagation with distortion and heaving. In this study, a three-dimensional moving finite element method based on automatic tetrahedronization (MFEM BOAT) is developed. This method makes it possible to simulate a complicated dynamic fracture. The moving fine elements subdivision is used to evaluate an exact solution fo

  IOP Publishing, 2010, IOP Conf. Series: Materials Science and Engineering 10, English

  [Refereed]

  International conference proceedings


• Development of moving finite element methods for fast crack propagation in functionally graded materials

  Toshihisa Nishioka, Kazuki Nishimura, Takehiro Fujimoto

  Japan Society of Mechanical Engineers, 2010, Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 76(771) (771), 1383 - 1389, Japanese

  [Refereed]

  Scientific journal


• A basic study of stop hole to prevent brittle high-speed crack propagation (2nd report, discussion of crack restart condition using the moving finite element analyses)

  Toshihisa Nishioka, Kotaro Yoshida, Yuichi Asai, Takehiro Fujimoto

  Japan Society of Mechanical Engineers, 2010, Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 76(772) (772), 1612 - 1617, Japanese

  [Refereed]

  Scientific journal


• The Derivation of a Variational Principle Minimizing Experimental Measurement Errors and the Formulation of an Intelligent Hybrid Measurement Method for Non-steady-state Temperature Fields

  NISHIOKA Toshihisa, WAKABAYASHI Masahiko, FUJIMOTO Takehiro

  A variational principle that minimizes the errors and noises associated with experimental measurements of two-dimensional non-steady-state temperature fields is investigated. The variational principle also assures the satisfaction of the governing time-developing heat conduction equation. On the basis of the variational principle, an intelligent hybrid experimental-numerical method is formulated and a scheme of calculation is presented. Furthermore, a numerical simulation is illustrated. The present paper is the extension of studies in steady-state temperature fields and is the development of researches in elastic deformation fields, elastic-plastic deformation fields, and the near-field of an interface crack tip.

  The Japan Society for Industrial and Applied Mathematics, 2009, The Japan Society for Industrial and Applied Mathematics Collected Papers, Vol 19, No. 2, pp. 169-181(2) (2), 169 - 181, Japanese

  [Refereed]

  Scientific journal


• The Developments of Three-dimensional Moving Finite Element Method Based on Delaunay Automatic Tetrahedronization and Evaluation Method of Fracture Mechanics Parameters for The Three-dimensionally Propagating Complicated Crack Tip Fronts

  NISHIOKA Toshihisa, OOTSUKA Tetsuya, FUJIMOTO Takehiro

  2009, Journal of the Japan Society of Mechanical Engineers, Vol 075, No. 758, pp. 116-122, Japanese

  [Refereed]

  Scientific journal


• Evaluation of Singular Field Near Crack Tip by Intelligent Hybrid Method Based on Digital Image Correlation ・ Delaunay Automatic Element Division FEM

  NISHIOKA Toshihisa, UMEMOTO Keigo, FUJIMOTO Takehiro

  In the experimental evaluation in transparent materials, generally optical techniques are often used. However, marine engine components are consist of metals, which are opaque materials. Therefore, visualization of stresses in metallic materials was almost impossible.In this paper, the intelligent hybrid method made it possible to visualize highly accurate stress and strain components in metallic materials.

  The Japan Institute of Marine Engineering, 2009, Journal of the JIME, Vo. 44, No. 6, pp. 111-116(6) (6), 962 - 967, Japanese

  [Refereed]

  Scientific journal


• Evalustion of Interference between Surface Crack and Hole Using VNA Solution-Finite Element Alternating Method

  NISHIOKA Toshihisa, HIROOKA Yusuke, WON YoungJun, ZHOU Guangqin, FUJIMOTO Takehiro

  2009, Journal of the JIME, Vol 44, No. 5, pp.142-147, English

  [Refereed]

  Scientific journal


• Strength Evaluation on Marine Crane-hook by Static-load Fatigue Experiments

  NISHIOKA Toshihisa, LEE HoYoen, WON YoungJun, FUJIMOTO Takehiro, FUKUI Tadahisa, KURODA Shigeyuki

  2009, International Symposium on Marine Engineering (ISME) 2009, English

  [Refereed]

  International conference proceedings


• Moving finite element simulation for crack propagation with elastic-plastic deformation in three point bending specimens

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2009, International Symposium on Marine Engineering (ISME) 2009, English

  [Refereed]

  International conference proceedings


• Development of Non-contact Evaluation Method for Impact Load using C.G.S. Method

  NISHIOKA Toshihisa, FURUYA Takashi, FUJIMOTO Takehiro, OKAMOTO Goro

  2009, The Society of Materials Science Japan,Special Issue IMPACT, Vol 58, No. 11, pp. 881-886, English

  [Refereed]

  Scientific journal


• An Intelligent Hybrid Measurement for Steady Temperature Field

  NISHIOKA Toshihisa, WAKABAYASHI Masahiko, FUJIMOTO Takehiro

  2009, Experimental mechanics, DOI 10.1007, s11340-009-9308-8, English

  [Refereed]

  Scientific journal


• High-efficient and High-precise Analysis of the Stress Intensity Factor for the Surface Semi-elliptical Crack on Ship Propeller Shaft which Receives Bending and Torsion Load Based on VNA Solution-Finite Element Alternating Method

  NISHIOKA Toshihisa, ZHOU Guangqin, FUJIMOTO Takehiro

  2008, The Japan Institution of Marine Engineering, Vol 43, No. 6, pp. 123-129, Japanese

  [Refereed]

  Scientific journal


• Simulation of Fatigue Fracture Path Prediction in Materials Containing Holes and Inclusions Using Moving Finite Element Method

  NISHIOKA Toshihisa, MASUGAMI Mayuko, FUJIMOTO Takehiro

  2008, JSME International Journal, Series A, Vol 74, No. 742, pp. 805-811, Japanese

  [Refereed]

  Scientific journal


• On the General Solutions for Mixed-Mode Penny-shaped Crack and Their Applications

  NISHIOKA Toshihisa, ZHOU Guangqin, FUJIMOTO Takehiro

  2008, Journal of Computational Science and Technology, Vol 2, No. 1, pp. 34-45, English

  [Refereed]

  Scientific journal


• Numerical Simulation and Experimental Studies of Complicated Mixed-Mode Dynamic Fracture Phenomena

  TOSHIHISA Nishioka, YAMAWAKI Teruaki, KOGAME Masahito, FUJIMOTO Takehiro

  2007, Journal of The JIME, Vol 42, No. 4, pp. 152-158, Japanese

  [Refereed]

  Scientific journal


• Numerical Analysis Evaluation of Crack Arrester for Brittle Fracture of Ship Hulls

  NISHIOKA Toshihisa, MASUGAMI Mayuko, MARUOKA Atsushi, FUJIMOTO Takehiro

  2007, Journal of The JIME, Vol 42, No. 3, pp. 132-137, Japanese

  [Refereed]

  Scientific journal


• Ultra High-speed Observation of Dynamic Fracture Using C.G.S. Methods under Mix-mode Impact Load

  NISHIOKA Toshihisa, KOGAME Masahito, FUJIMOTO Takehiro, OKAMOTO Goro

  2007, Tech Science Press, ICCES, Vol. 1, No. 3, pp. 113-118, English

  [Refereed]

  Scientific journal


• Ultra High-speed Observation of Dynamic Fracture Using C.G.S. Methods under Mix-mode Impact Load

  NISHIOKA Toshihisa, KOGAME Masahito, FUJIMOTO Takehiro, OKAMOTO Goro

  2007, Proceedings of ICCES '07, pp. 1099-1104, English

  [Refereed]

  International conference proceedings


• The Moving Finite Element Method Based on Delaunay Automatic Triangulation for Fracture Path Prediction Simulations in Nonlinear Elastic-Plastic Materials

  NISHIOKA Toshihisa, KOBAYASHI Yutaka, FUJIMOTO Takehiro

  2007, Computer Modeling in Engineering & Sciences, Vol 17, No. 3pp. 231-238, English

  [Refereed]

  Scientific journal


• Numerical Simulations of Complex Impact Fracture Phenomena Using the Moving Finite Element Method based on Delaunay Automatic Triangulation

  NISHIOKA Toshihisa, YAMAWAKI Teruaki, FUJIMOTO Takehiro

  2007, Proceedings of APCOM'07-EPMESC XI, No. MS15-1-4, pp. 1-10, English

  [Refereed]

  International conference proceedings


• Numerical Simulation of Dynamic Nonlinear Fracture based on Various Fracture Path Prediction Theories

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2007, Tech Science Press, ICCES, Vol 1, No. 3, pp. 133-138, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Dynamic Nonlinear Fracture based on Various Fracture Path Prediction Theories

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2007, Proceedings of ICCES '07, pp. 1119-1124, English

  [Refereed]

  International conference proceedings


• Numerical Simulation for Nonlinear Deformation near Crack Tip using Micro Scale Matirial Model

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2007, Proceedings of APCOM'07-EPMESC XI, No. MS15-1-2, pp. 1-10, English

  [Refereed]

  International conference proceedings


• Moving Finite Element Simulation of Various Fracture Prediction in Materials Containing Holes and Inclusion

  NISHIOKA Toshihisa, MASUGAMI Mayuko, FUJIMOTO Takehiro

  2007, Tech Science Press, ICCES, Vol 1, No. 3, pp. 119-125, English

  [Refereed]

  Scientific journal


• Moving Finite Element Simulation of Various Fracture Prediction in Materials Containing Holes and Inclusion

  NISHIOKA Toshihisa, MASUGAMI Mayuko, FUJIMOTO Takehiro

  2007, Proceedings of ICCES '07, pp.1105-1111, English

  [Refereed]

  International conference proceedings


• High-precision Path Prediction Simulation of Non-straight and High-speed Propagating Crack

  NISHIOKA Toshihisa, FUJITA Noriko, FUJIMOTO Takehiro

  2007, Tech Science Press, ICCES, Vol 1, No. 3, pp. 127-132, English

  [Refereed]

  Scientific journal


• High-precision Path Prediction Simulation of Non-straight and High-speed Propagating Crack

  NISHIOKA Toshihisa, FUJITA Noriko, FUJIMOTO Takehiro

  2007, Proceedings of ICCES '07, pp. 1113-1118, English

  [Refereed]

  International conference proceedings


• Basic Study of an Intelligent Hybrid Measurement Method for Temperature Field

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, WAKABAYASHI Masahiko

  2007, Proceedings of APCOM'07-EPMESC XI, No. MS34-2-4, pp. 1-10, English

  [Refereed]

  International conference proceedings


• Ultra High-speed Observation of Dynamic Fracture Using C.G.S. Methods under Mix-mode Impact Load

  Toshihisa NISHIOKA, Masahito KOGAME, Takehiro Fujimoto, Goro OKAMOTO

  Jan. 2007, Proceedings of ICCES '07, pp.1099-1104, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Dynamic Nonlinear Fracture based on Various Fracture Path Prediction Theories

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  Jan. 2007, Proceedings of ICCES '07, pp.1119-1124, English

  [Refereed]

  Scientific journal


• Moving Finite Element Simulation of Various Fracture Prediction in Materials Containing Holes and Inclusion

  Toshihisa NISHIOKA, Mayuko Masugami, Takehiro Fujimoto

  Jan. 2007, Proceedings of ICCES '07, pp.1105-1111, English

  [Refereed]

  Scientific journal


• High-precision Path Prediction Simulation of Non-straight and High-speed Propagating Crack

  Toshihisa NISHIOKA, Noriko Fujita, Takehiro Fujimoto

  Jan. 2007, Proceedings of ICCES '07, pp.1113-1118, English

  [Refereed]

  Scientific journal


• Development of Numerical Simulation Method for Fracture Path Prediction in Elastic-Plastic Materials based on Incremental Variational Principle

  Toshihisa NISHIOKA, Yutaka Kobayashi, Takehiro Fujimoto

  Nov. 2006, Transactions of the Japan Society for Computational Engineering and Science, 論文番号20060035 pp.1-6, Japanese

  [Refereed]

  Scientific journal


• Fracture-Path Prediction Simulations in Elastic-Plastic Metallic Materials under several types of mixed-mode conditions

  Toshihisa NISHIOKA, Yutaka Kobayashi, Takehiro Fujimoto

  Oct. 2006, Proceedings of Techno-Ocean 2006/19th JASNAOE Ocean Engineering Symposium Kobe, Paper No. 41, English

  [Refereed]

  Scientific journal


• Experimental Study on Fatigue Crack Propagation Path for Structures Containing Multiple Circular Holes

  Toshihisa NISHIOKA, Young-Jun Won, Mayuko Masugami, Takehiro Fujimoto

  Oct. 2006, Proceedings of Techno-Ocean 2006/19th JASNAOE Ocean Engineering Symposium, Paper No. 40, English

  [Refereed]

  Scientific journal


• On the general Solutions for Mixed-Mode penny-shaped Crack and Their Applications

  NISHIOKA Toshihisa, Guangqin SHU, FUJIMOTO Takehiro

  Jun. 2006, Transactions of the Japan Society of Mechanical Engineering, (A編),第72巻718号, Japanese

  [Refereed]

  Scientific journal


• Relationship between Pattern of Fatigue Crack Surface and Fatigue Crack Growth Behavior under KIII Mode, Four Point Shear, in A5083

  KIN Gun-ho, NISHIOKA TOSHIHISA, Won Young Jun, Keigo SAKAKURA, Takehiro FUJIMOTO

  May 2006, Journal of the Korean Society of Marine Engineering, 30(4) (4), 474 - 482, English

  [Refereed]

  Scientific journal


• On the general Solutions for Mixed-Mode penny-shaped Crack and Their Applications

  NISHIOKA Toshihisa, ZHOU Guangqin, FUJIMOTO Takehiro

  2006, Transactions of the Japan Society of Mechanical Engineering, Series A, Vol 72, No. 718, pp. 929-936, Japanese

  [Refereed]

  Scientific journal


• Numerical Simulation of Dynamic Elasto Visco-plastic Fracture Using Moving Finite Element Method

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  2006, Special Issue in Celebrating Professor Satya N. Atluri's 60th Anniversary, Computer Modeling in Engineering and Sciences, Vol. 11, No.2, pp.91-101, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Simulation of Dynamic Elasto Visco-plastic Fracture Using Moving Finite Element Method

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2006, Computer Modeling in Engineering and Sciences, Vol 11, No. 2, pp. 91-101, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Investigation of the Multiple Dynamic Crack Branching Phenomena

  Toshihisa NISHIOKA, Stanislav Tchouikov, Takehiro FUJIMOTO

  2006, Computers, Materials and Continua, Vol. 3, No.3, pp. 147-153, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Study for High-Speed Crack Propagation Phenomena under Static Multi Loading System

  Toshihisa NISHIOKA, Ken YAMAGUCHI, Yoshihito SAKAGUCHI, Hiroyuki FURUTA, Keigo SAKAKURA, Takehiro FUJIMOTO

  日本実験力学会, Dec. 2005, Experimental Mechanics, Japan Society of Experimental Mechanics, Vol.5, No.4, 12月号(4) (4), 367 - 372, Japanese

  [Refereed]

  Scientific journal


• Numerical Simulation of Dynamic Elasto Visco-plastic Fracture Using Moving Finite Element Method

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  Apr. 2005, Special Issue in Celebrating Professor Satya N. Atluri’s 60th Anniversary, Computer Modeling in Engineering and Sciences,, Vol.11, No.2, (2005), pp.91-10, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Simulation of Impact Transonic and Supersonic Fracture of Crack Propagating along the Diagonal Interface

  NISHIOKA Toshihisa, TSUDA Toru, FUJIMOTO Takehiro

  2005, The Proceedings of ICCES 2005, Chapter 12, pp. 2933-2938, English

  [Refereed]

  International conference proceedings


• Numerical Simulation of Dynamic Elasto Visco-plastic Fracture Using Mesh Extension Method

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2005, The Proceedings of International Workshop on Development and Advancement of Computational Mechanics, pp. 114-123, English

  [Refereed]

  International conference proceedings


• Fracture Path Prediction Simulations of Dynamic Nonlinear Fracture in Pure Aluminum Specimen

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2005, The Proceedings of ICCES 2005, Chapter 12, pp. 46-51, English

  [Refereed]

  International conference proceedings


• Fracture-Path Prediction SImulations in Elastic-Plastic Materials based on Incremental Variational Principle

  NISHIOKA Toshihisa, KOBAYASHI Yutaka, FUJIMOTO Takehiro

  2005, The Proceedings of ICCES 2005, Chapter 12, pp. 2171-2176, English

  [Refereed]

  International conference proceedings


• Dynamic Fracture Path Prediction Simulation for the Materials and Structures Containing Circular Holes and Inclusions

  NISHIOKA Toshihisa, MARUOKA Atsushi, FUJIMOTO Takehiro

  2005, The Proceedings of ICCES 2005, Chapter 12, pp. 2939-2944, English

  [Refereed]

  International conference proceedings


• Analysis of Semicircular Surface Crack in Finite Plate Using the General Solution of Circular Crack

  NISHIOKA Toshihisa, ZHOU Guangqin, FUJIMOTO Takehiro

  2005, The Proceedings of ICCES 2005, Chapter 12, pp. 2320-2325, English

  [Refereed]

  International conference proceedings


• Observation of the Near Field of Transonically Propagating Interfacial Crack

  NISHIOKA Toshihisa, ENDO Fumitaka, FUJIMOTO Takehiro

  Jun. 2004, The Proceedings of the 2004 Society for Experimental Mechanics, Session 95, No. 169, pp. 1-6., English

  [Refereed]

  International conference proceedings


• Two-dimensional and Three-dimensional Moving Finite Element Analysis for High-speed Crack Propagation in Brittle Materials

  NISHIOKA Toshihisa, YAMAGUCHI Ken, FURUTA Hiroyuki, FUJIMOTO Takehiro

  2004, The Proceedings of ICCES 2004, Chapter 19, No. 562, pp. 1893-, English

  [Refereed]

  International conference proceedings


• T* Integral Analysis of Shell Structures with Through-Wall Cracks for Nonlinear Deformation Problems

  NISHIOKA Toshihisa, MIYANISHI Takako, FUJIMOTO Takehiro

  2004, The Proceedings of ICCES 2004, Chapter 19, No. 561, pp. 1875-, English

  [Refereed]

  International conference proceedings


• Prediction mode numerical simulation for non-straight propagating crack in elasto-plastic material

  NISHIOKA Toshihisa, OKA Soichiro, FUJIMOTO Takehiro

  2004, The Proceedings of ICCES 2004, Chapter 19, No. 563, pp. 1881-, English

  [Refereed]

  International conference proceedings


• Numerical Simulation of Impact Transonic Interfacial Fracture with the Crack Coalescence

  NISHIOKA Toshihisa, TSUDA Toru, FUJIMOTO Takehiro

  2004, Materials Science Forum, Vols 465-466, pp. 61-67, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Impact Transonic Interfacial Fracture with the Crack Coalescence

  NISHIOKA Toshihisa, TSUDA Toru, FUJIMOTO Takehiro

  2004, Material Science Forum, Vols 465-466, pp. 61-67, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Impact Transonic Interfacial Fracture

  NISHIOKA Toshihisa, TSUDA Toru, FUJIMOTO Takehiro

  2004, Key Engeneering Materials, Vols 261-263, pp. 301-306, English

  [Refereed]

  Scientific journal


• Numerical Simulation of Dynamic Elasto Visco-plastic Crack Propagation with Wake Zone

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  2004, The Proceedings of ICCES 2004, Chapter 19, No. 560, pp. 1821-, English

  [Refereed]

  International conference proceedings


• Numerical Prediction of Dynamically Propagating and Branching Cracks Using Moving Finite Element Method

  TCHOUIKOV Stanislav, NISHIOKA Toshihisa, FUJIMOTO Takehiro

  2004, Computers, Materials and Continua, Vol 1, No. 2, pp. 191-204, English

  [Refereed]

  Scientific journal


• Numerical Investigation of the Multiple Dynamic Crack Branching Phenomena

  NISHIOKA Toshihisa, TCHOUIKOV Stanislav, FUJIMOTO Takehiro

  2004, The Proceedings of ICCES 2004, Chapter 19, No. 559, pp. 1887-, English

  [Refereed]

  International conference proceedings


• On Intelligent Experimental-Numerical Hybrid Methods in Crack Problems

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, FUKUMAN Satoshi, OKA Soichiro

  In this paper, intelligent hybrid methods that automatically detect and eliminate errors and noises in full-fields experimental measurement fields are summarized. Each intelligent hybrid method is constructed by the corresponding variational principle minimizing the experimental measurement errors. In this paper, for elastic-plastic problems, the incremental variational principle is explained. The intelligent hybrid method makes it possible to estimate stresses, fracture mechanics parameters and other higher order parameters. The intelligent hybrid methods demonstrate the applicability for elastic-plastic crack, interfacial crack and three-dimensional crack problems.

  The Japanese Society for Experimental Mechanics, Sep. 2003, Proceedings of the Japan Society for Photoelasticity, 3(3) (3), 148 - 154, Japanese


• Evaluation of Dynamic Crack Bifurcation by Method of Caustic

  NISHIOKA Toshihisa, MATSUMOTO Kazunori, FUJIMOTO Takehiro, SAKAKURA Keigo

  Crack bifurcation phenomena depend on loading condition and characteristic of material. Therefore, we try to observe simple crack bifurcation phenomena by the dual loading system. In this study, the method of caustics and a high-speed photography system are used to record the dynamic crack bifurcation phenomena.
  At first, the experiments for dynamic crack propagation are carried out under various loads. Occurrence of crack bifurcation depends on load balance in the dual loading system. For the cases of dynamic crack bifurcation and nonbifurcation, the fracture mechanics parameters are evaluated based on the experimental results. For all crack bifurcation cases, the energy flux values at the crack bifurcation moment are almost constant, which indicates an existence of critical material value governing the dynamic crack bifurcation.
  Next, the special cases of crack bifurcation are discussed. The asymmetric crack bifurcation is occurred under thesame governing low for dynamic crack bifurcation. Also the fracture mechanics parameters at each crack tip have different values. In one more special case, single crack bifurcates to three propagating cracks. These three cracks start propagating from same material point.

  The Japanese Society for Experimental Mechanics, Jun. 2003, Proceedings of the Japan Society for Photoelasticity, 3(2) (2), 77 - 84, Japanese


• Basic Research on Transonic Fracture in Homogeneous Materials

  NISHIOKA Toshihisa, SAKAGUCHI Yoshihito, FUJIMOTO Takehiro, SAKAKURA Keigo

  The Japan Society of Mechanical Engineers, 2003, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2003, 861 - 862, Japanese


• Experimental Measurement to Clarify Fracture-Mechanism on Weak Planes in Mono-Material

  NISHIOKA Toshihisa, MATSUMOTO Kazunori, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 2003, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2003, 843 - 844, Japanese


• Small and Micro Scale Observations of Near-field of Interfatial Crack-tip

  NISHIOKA Toshihisa, ENDO Fumitaka, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 2003, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2003, 845 - 846, Japanese


• Concepts of Separated J Integrals,Separated Energy Release Rates and the Compinent Sparation Method of the J Integral for Interfacial Fracture Mechanics

  NISHIOKA Toshihisa, SYANO S, FUJIMOTO Takehiro

  2003, Transations of The ASME,Journal of Applied Mechanics, Vol.70,No.5,Issue4,pp.505-516, English

  Scientific journal


• Observation of Characteristics of Transonic Interfacial Fracture Phenomena Using Optical Experimental Method

  NISHIOKA Toshihisa, NOZAKI Takuma, FUJIMOTO Takehiro, SAKAKURA Keigo

  The Japan Society of Mechanical Engineers, 2002, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2002, 659 - 660, Japanese


• Numerical Simulation for Dynamic Crack Propagation Phenomena with Large Deformation under Impact Shear Load

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 2002, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2002, 673 - 674, Japanese


• Numerical Simulation for Transonic Interfacial Fracture Using Moving Finite Element Method

  NISHIOKA Toshihisa, TSUDA Toru, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 2002, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2002, 661 - 662, Japanese


• 461 Experiment and Numerical Simulation on the Crack Growth under Mixed-Mode under Static Load

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, KISHIMOTO Kengo, HASHIMOTO Masanori, TAKAGI Motoyuki

  The Japan Society of Mechanical Engineers, 2001, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2001, 473 - 474, Japanese


• 138 Masurememt of Stress Intensity Factor for Composite Material Dynamic Interface Crack by Component Separation Method of Dynamic J-Integral

  NISHIOKA Toshihisa, NISHIOKA Ryouta, FUJIMOTO Takehiro, SHEN Shengping

  The Japan Society of Mechanical Engineers, 2001, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2001, 85 - 86, Japanese


• K-0728 Development of Method of Numerical Prediction for Fracture Path of Curving Crack Using the T^* Integral

  NISHIOKA Toshihisa, KOBAYASHI Yutaka, FUJIMOTO Takehiro

  The aim of this study is to examine the applicability of the T^* integral to numerical prediction for fracture path of curving crack. In this paper, the theoretical background on numerical prediction for fracture path of curving crack using T^* integral is shown. As a special case, we carried out the elastic numerical prediction using the T^* integral, the moving finite element method and the Delaunay triangulation for fracture path of curving crack under mixed mode condition. Results of this numerical prediction are shown in this paper.

  The Japan Society of Mechanical Engineers, 2001, The proceedings of the JSME annual meeting, 1, 345 - 346, Japanese


• F-1105 Evaluation of a Kinked Interface Crack by Moire Interferometry and FEM

  NISHIOKA Toshihisa, YAO Jianliang, FUJIMOTO Takehiro

  In this study, the interfacial crack kinking behavior of bimaterial specimens are investigated. The bimaterial specimen consist of epoxy and aluminum alloy. To produce various mixed-mode states, the loading angle is changed systematically from 0°to 180°. All kinked fractures occurred at loading angle ≧120°. The crack-tip deformation of bimaterial specimens is observed by Moire Interferometry. The fracture mechanics parameters for interfacial crack in bimaterial specimens are evaluated by the aid of finite element analyses. Fractures energy supply for interfacial crack is discussed by the measurements of separated J integral. The component separation method is used to estimate stress intensity factor for interfacial crack.

  The Japan Society of Mechanical Engineers, 2001, The proceedings of the JSME annual meeting, 1, 191 - 192, Japanese


• K-0830 Evaluation of Stress Singularity for Three-Dimensional Propagating Cracks

  NISHIOKA Toshihisa, STAN Felicia, FUJIMOTO Takehiro

  In this study, using the moving finite method, the generation-phase simulation of three-dimensional dynamic fracture in a double cantilever beam specimen is carried out. Also, the theoretical and computation aspects related to the response of time varying fracture parameters such as dynamic J integral and stress intensity factor along the propagating crack front are presented. The stress singularities along the dynamically propagating crack front are evaluated. Especially the stress singularities at the corner points are investigated in relation with the shapes of the dynamically propagating crack fronts.

  The Japan Society of Mechanical Engineers, 2001, The proceedings of the JSME annual meeting, 1, 439 - 440, English


• The Evaluation of Mixed-Mode Stress Intensity Factors of an Interface Crack by Component Separation Method of J integral

  NISHIOKA Toshihisa, SYANO Shinichiro, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 2000, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2000, 227 - 228, Japanese


• Evaluation of Characteristics of Transonic Interfacial Fracture Phenomena Using Ultra-high Speed Photography

  NISHIOKA Toshihisa, MIYAUCHI Hidemi, FUJIMOTO Takehiro, SAKAKURA Keigo

  The Japan Society of Mechanical Engineers, 2000, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2000, 229 - 230, Japanese


• The Observations of Surfaces and Paths of Mixed-mode Fracture under Static and Impact Loading

  NISHIOKA Toshihisa, TAKAGI Motoyuki, FUJIMOTO Takehiro, SAKAKURA Keigo

  The Japan Society of Mechanical Engineers, 2000, Proceedings of the 1992 Annual Meeting of JSME/MMD, 2000, 307 - 308, Japanese


• Fracture-path Prediction Simulation for Dynamic Crack Branch Phenomenon Using a Moving Finite Element Method

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, KAWANO Akiomi, TCHOUIKOV Stanislav, FURUTSUKA Jyunpei

  In actual fracture phenomena, branched cracks were often observed. The numerical simulation technique of dynamic crack bifurcation has not been established enough due to some numerical difficulties. The development of this simulation technique is very important to clarify the crack bifurcation mechanism. The authors have previously developed the moving finite element method with Delaunay triangulation for crack bifurcation analyses. In this study, the numerical path prediction is tried by using the moving FEM. For bifurcated cracks, crack propagation paths are predicted according to the maximum hoop stress. The results of numerical prediction agree with the experimental results and the results of generation phase simulation. In these simulations, the fracture mechanics parameters were accurately calculated by special form of the dynamic J integral.

  The Japan Society of Mechanical Engineers, 2000, The proceedings of the JSME annual meeting, 2000, 63 - 64, Japanese


• Development of a Numerical Prediction Method for Crack Growth Path Under Mixed-mode Static Load

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, HASHIMOTO Masanori, NISHIDA Hiroki

  In this study, the difference of static and dynamic fracture behavior is discussed to clarify the characteristic of dynamic fracture under mixed-mode load. The automatic moving finite element method with Delaunay triangulation is developed to archive numerical prediction for fracture path of three-point bending specimen. The fracture path of curving crack is predicted by using the maximum hoop stress (σ_<θθ> maximum) criterion and the local symmetry criterion (K_=0 criterion). The numerical results of the fracture path prediction simulations agree with the results of experiment. The predicted paths of static fracture considerably differs from that dynamic fracture under impact load. In the case of static load the fracture paths are not much influenced by the loading eccentricity.

  The Japan Society of Mechanical Engineers, 2000, The proceedings of the JSME annual meeting, 2000, 59 - 60, Japanese


• Study on Interfacial Crack Kinking Fracture Under Mixed Mode Loading

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, YAO Jianliang, NOZAKI Takuma, SAKAKURA Keigo

  In this study, the interfacial crack kinking behavior of bimaterial specimens are investigated. The bimaterial specimen consist of epoxy and aluminum. To produce various mixed-mode states, the loading angle is changed systematically from 0° to 180°. The fracture mechanics parameters for interfacial crack in bimaterial specimens are evaluated by the aid of finite element analyses. All kinked fractures occurred at loading angle ≧120°. Fractures energy supply for interfacial crack is discussed by the measurements of separated J integral. The component separation method is used to estimate stress intensity factor for interfacial crack. In this paper, the stress intensity factors at the characteristic length 1=2a are calculated.

  The Japan Society of Mechanical Engineers, 2000, The proceedings of the JSME annual meeting, 2000, 61 - 62, Japanese


• Measurements of the Near-Tip Deformation in Inhomogeneous Elastic-Plastic Fracture Specimens Using the Moire Interferometry.

  Nishioka Toshihisa, Nishi Masaki, Fujimoto Takehiro, Sakakura Keigo, Epstein S. Jonathan

  In order to investigate inhomogeneity effects in elastic-plastic fracture, A533B steel and HT80 steel, which have considerably different yield stresses, were chosen. The moire interferometry was used for direct measurements of the crack-tip behavior in the homogeneous CT specimens of A533B and HT80, and in electron-beam-welded inhomogeneous CT specimens of these two materials. Two-dimensional moire gratings with relatively low frequency of 300 lines/mm were used to follow large plastic deformations. The near-tip deformations were compared with the corresponding HRR singular fields. Large inhomogeneity effects were observed in the moire fringe patterns as plastic deformations proceed.

  The Japan Society of Mechanical Engineers, 1993, Transactions of the Japan Society of Mechanical Engineers Series B, 59(559) (559), 558 - 565, Japanese


• A study on the Front Shapes and Surface Singularity of Dynamically Propagating Cracks.

  Nishioka Toshihisa, Nishi Masaki, Fujimoto Takehiro, Sakakura Keigo

  In the present study, the shapes of dynamically propagating crack fronts in relatively thick DCB specimens of PMMA (polymethyl methacrylate) were taken using a high-speed camera. The nature of mirrorlike fracture surfaces in PMMA was utilized to visualize the instantaneous crack shapes in high-speed photographs. This feature was also used in the trigger system for the light source of the high-speed camera. Precise measurements of instantaneous crack fronts appearing in the high-speed photographs were made using an image processor. The crack-front angles to the free surfaces are investigated in connection with the singularity behavior at the corner points.

  The Japan Society of Mechanical Engineers, 1993, Transactions of the Japan Society of Mechanical Engineers Series B, 59(559) (559), 666 - 673, Japanese

• 270 Three-point bending crack propagation analysis of cast iron beam subjected to eccentric impact loading by X-FEM

  TSUDA Toru, OHNISHI Yoshihiro, CHO Kyuchun, FUJIMOTO Takehiro

  近年,提案された拡張有限要素法X-FEMは,FEMの要素の形状関数にき裂が持つ不連続性や特異性を表す関数を付加するものである.ここでは,鋳鉄製梁の偏心荷重を受ける三点曲げ衝撃問題において,荷重の作用速度の依存性についてLS-DYNAのX-FEMによる数値解析と試験結果を比較し検証した.

  The Japan Society of Mechanical Engineers, 10 Oct. 2015, The Computational Mechanics Conference, 2015(28) (28), "270 - 1"-"270-3", Japanese


• M204 Experimental research for fatigue crack growth of Inconel600

  SAWA Masaaki, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 278 - 278, Japanese


• M310 Ultra-high speed photographing for fast fracture behaviour from various notch tip

  KASHIHARA Kazuhito, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2015, 関西支部講演会講演論文集, 2015(90) (90), 304 - 304, Japanese


• 2306 Basic study for development of a dynamic intelligent hybrid method

  YAMADA Masayoshi, FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 02 Nov. 2013, The Computational Mechanics Conference, 2013(26) (26), "2306 - 1"-"2306-2", Japanese


• 2302 Three-dimensional Moving Finite Element Analysis for Fracture Behavior of Connecting Rods

  MARUO Kyohei, MURAKAMI Tomohiro, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 02 Nov. 2013, The Computational Mechanics Conference, 2013(26) (26), "2302 - 1"-"2302-2", Japanese


• 1903 A Study of The Material Heat Treatment and Multiple cracks Interaction Effect on Fatigue Growth of a Surface crack

  Lee Hoyeon, Fujimoto Takehiro, Won Youngjun, nishioka Toshihisa

  The Japan Society of Mechanical Engineers, 06 Oct. 2012, The Computational Mechanics Conference, 2012(25) (25), 554 - 555, Japanese


• 1902 Analysis of Curve Front Crack Propagation using Three Dimensional Moving Finite Element Method Based on Delaunay Automatic Mesh Generation

  MATSUBARA Hitoshi, FUJIMOTO Takehiro, NISIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 06 Oct. 2012, The Computational Mechanics Conference, 2012(25) (25), 563 - 564, Japanese


• 602 Basic Study of Dynamic Crack Branching Under Impact Loading

  NISHIOKA Toshihisa, NEGISHI Yuta, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2012, 関西支部講演会講演論文集, 2012(87) (87), "6 - 2", Japanese


• OS12F076 Ultra-high-speed Observation of cutting of failure phenomenon in thin metallic lamina by punch and measurement of displacements by digital image correlation method

  Nishioka Toshihisa, Iwawaki Takashi, Fujimoto Takehiro, Kashiwara Yoshiyuki

  Machine components of industrial products are often produced by press cutting. However, the mechanism of cutting (ductile fracture of metals) is not perfectly understood. In order to clarify this mechanism, cutting processes were observed by an ultrahigh-speed camera. The ultrahigh-speed camera is capable of recording 10,00,000 frames per second (102 frames in a 10-ns exposure time); each frame has 80,000 pixels. Therefore, this ultrahigh-speed camera is currently the world's most advanced camera in terms of spatial and time resolutions. A detailed movie of the cutting process was recorded. The details of the cutting process include the crack length versus time, crack tip opening angle, and fracture path. The crack tip opening angles were evaluated approximately 0.1 mm behind the tip of the propagating crack. The CTOA criterion was found to be almost valid during the cutting process. Furthermore, in order to use the image correlation method, random patterns were generated by spraying paint onto the metal sections. Images of a specimen section were taken after punching the sheet metal. The distributions of displacements were evaluated by the digital image correlation method. We found smoothly cut sections and rough surfaces. A smoothly cut section is very important for industrial products. In this study, the optimal speed of punching and punch-die clearances were examined. The ductile fracture criterion determined in this study is extremely useful for fabricating machine components by press cutting because it can be used for simulations without the need for a cutting system. The data of the image correlation method can be used for an intelligent hybrid method that can provide very accurate strain and stress distributions and fracture parameters such as the T* integral, which is the most promising fracture parameter for assessing the quality of metallic materials.

  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), "OS12F076 - 1"-"OS12F076-8", English


• OS12F036 Experimental study on thermal stress fracture problem using image correlation method

  Nishioka Toshihisa, Komaru Yuito, Ikenishi Kenji, Tsuru Hideto, Fujimoto Takehiro

  Fracture mechanics is a discipline that originated from the need to prevent accidents and the experience of many unexpected structure failures. In a structure failure, there are many cases where an accident is caused by a crack that forms and propagates because of internal defects. In the case of an engine and high-speed rotation equipment, the safety design may receive a load at a temperature outside the normal temperature range owing to the thermal stress effect. Therefore, in order to avoid failure due to thermal stress, this effect needs to be evaluated. However, the safety rate at which the effect of the heat stress is quantitatively evaluated in all cases is not necessarily set, and heat load accidents may be reported as rebooting of the engine. There are a lot of theses of low cycle, for example, exhaust manifold of the engine thermal fatigue etc. as for many of researches by the thermal stress effect, and the finding until fracture after the crack propagation is not obtained enough. We used a digital image correlation method to obtain a basic understanding of fracture phenomena due to thermal stress.

  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), "OS12F036 - 1"-"OS12F036-9", English


• 521 Simulation Using a Moving Finite Element Method of Experiment for Semistatic Curving Crack Propagation Using C.G.S. Method

  NISHIOKA Toshihisa, NODA Kensuke, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2010, 関西支部講演会講演論文集, 2010(85) (85), "5 - 21", Japanese


• 508 Moving Finite Element Analysis of Dynamic Fracture Behavior under Eccentric Impact Loading

  Nishioka Toshihisa, Fujioka Takanori, Fujimoto Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2010, 関西支部講演会講演論文集, 2010(85) (85), "5 - 8", Japanese


• 314 Analyses of complex deformation behavior in metal using Distinct Element Method

  NISHIOKA Toshihisa, NAKANO Yuu, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2010, 関西支部講演会講演論文集, 2010(85) (85), "3 - 20", Japanese


• 324 Derivation Of Path Independent Integral on Heat Conduction Field

  Nishioka Toshihisa, Asai Yuichi, Fujimoto Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2010, 関西支部講演会講演論文集, 2010(85) (85), "3 - 30", Japanese


• OS0906 Study for dependence of fracture behavior on impact velocity in aluminum alloy

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  Fracture toughness K_ or J_ is generally used as criterion for safety design. These criteria are defined under plane sirain condition. Shear lips on crack surface is caused in case of thin plates fracture. Therefore, fracture mechanism in thin plates is not clarified. And some of these fracture behavior depends on loading speed. In this study, three point bending fracture experiments are demonstrated to gain basic data for elastic plastic fracture in thin plates. The specimens are consists of aluminum alloy. Pure mode I and mixed mode fracture experiments are done under quasi-static loading and dynamic loading. Roughness on crack surfaces are evaluated using laser focus displacement meter. Fracture path, crack surface trend and surface roughness are depended on loading speed.

  The Japan Society of Mechanical Engineers, 24 Jul. 2009, M&M材料力学カンファレンス, 2009, 179 - 181, Japanese


• OS0105 Numerical simulation of fracture path prediction for stress corrosion cracking

  NISHIOKA Toshihisa, NIWA Hayato, FUJIMOTO Takehiro

  In recent years, it causes the stress corrosion cracking, and the breakdowns of piping have occurred in the nuclear power generation plant. As a result, there is a possibility that a serious accident of radiation leak happens. The stress corrosion cracking is a phenomenon that the crack occurs in the material because of the interaction of the stress and the erosive environment, and the crack progresses at time. This study is about the stress corrosion cracking in the combination of the SCM435 steel and the boric acid solution. This combination has the feature that corrosion happens comparatively easily. This simulation is done according to acquired data by the experiment. The stress intensity factor is compared with an analytical solution, and the validity of this simulation is verified. Moreover, the application to the simulation including holes is verified as a result.

  The Japan Society of Mechanical Engineers, 24 Jul. 2009, M&M材料力学カンファレンス, 2009, 75 - 77, Japanese


• OS0617 Simulation of fracture path prediction in functionally graded materials

  NISHIOKA Toshihisa, NISHIMURA Kazuki, FUJIMOTO Takehiro

  Functionally graded materials (FGMs) are those whose composition and hence the properties vary gradually as a function of position. As the materials that the body surface and difference of temperature with the inside can bear a severe condition of 1,000 degrees Celsius, the use is expected to strong in heat and mechanics, in the field of aerospace that a concept of FGMs. However, The space mission using space shuttle heavily relies on the perfonnance of FGMs, since space shuttle is protected by FGM panels. Its vely important to understand fracture behavior of FGM Up to now; the evaluation technique has not been developed, due to many complex behaviors of FGMs. In this paper, simulation technique of fracture path prediction in functionally graded materials was successfully developed.

  The Japan Society of Mechanical Engineers, 24 Jul. 2009, M&M材料力学カンファレンス, 2009, 234 - 236, Japanese


• 810 Evaluation of Impact Load based on C.G.S. Fringe Patterns or Correlation Images

  NISHIOKA Toshihisa, FURUYA Takashi, FUJIMOTO Takehiro, OKAMOTO Goro

  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 - 10", Japanese


• 202 Evaluation of singular field near a crack tip on metallic rough surface using Digital Image Correlation-FEM Intelligent Hybrid Method

  Nishioka Toshihisa, Umemoto Keigo, Fujimoto Takehiro

  The Japan Society of Mechanical Engineers, 16 Mar. 2009, 関西支部講演会講演論文集, 2009(84) (84), "2 - 2", Japanese


• GS0904 ultra-high speed observation of brittle fracture behavior near hole type crack arrester using Coherent Gradient Sensing method.

  NISHIOKA Toshihisa, OOYA Takashi, FUJIMOTO Takehiro, OKAMOTO Gorou

  クラックアレスタの一つとして構造物中に小さな円孔を開け、進展き裂を円孔へ誘導し応力集中を緩和させる方法がある。部材内での発生が予想されるき裂進展挙動に対して、適切な箇所に適切な大きさの円孔を配置することができれば部材強度を保持しつつ、き裂進展現象を防ぐことが期待できる。本実験では準静的荷重を試験片に加えることで高速き裂進展を発生させ、径の異なったストップホールがき裂進展に及ぼす影響とき裂進展の停止・再進展の様子を明らかにするためC.G.S.法を用いた超高速度観察を行った。き裂進展する以前のJ積分値が約15000〜約20000(N/m)の値のときストップホール径を1.5mm以上にした場合き裂進展を停止できる結果となった.

  The Japan Society of Mechanical Engineers, 16 Sep. 2008, M&M材料力学カンファレンス, 2008, "GS0904 - 1"-"GS0904-2", Japanese


• GS0905 Moving finite element analyses for crack arrestability of stiffener in thick steel plates

  Nishioka Toshihisa, Fujimoto Takehiro, Tsutsumi Kazuyuki, Hanawa Yoji, Nakagawa Tomokazu

  昨今の船舶の大型化により,舶用鋼板の肉厚は増大しつつある.この舶用鋼板厚の増大・製造時の大入熱溶接によって,厚鋼板には従来の脆性破壊停止基準が適用し難くなっており,破壊メカニズムの再評価が求められている.本研究では,継ぎ手構造を有する大型厚鋼板の脆性破壊試験に準じた移動有限要素解析を行い,s関数を用いた動的J積分評価法,成分分離法を用いて破壊力学パラメータを評価した.破壊力学パラメータの推移およびき裂先端近傍の変形挙動からは継ぎ手構造付与による破壊力学パラメータ値の抑制が認められた.

  The Japan Society of Mechanical Engineers, 16 Sep. 2008, M&M材料力学カンファレンス, 2008, "GS0905 - 1"-"GS0905-2", Japanese


• 908 Developing the method of Contact load evaluation by Random pattern Image correlation

  NISHIOKA Toshihisa, YABUUCHI Ryota, FUJIMOTO Takehiro

  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 - 8", Japanese


• 317 Moving Finite Element Simulation of Fracture Path Predictions Dynamic Fracture and Fatigue Crack Propagation in Materials Containing Holes

  NISHIOKA Toshihisa, MASUGAMI Mayuko, WON Young Jun, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 02 Nov. 2006, The Computational Mechanics Conference, 2006(19) (19), 167 - 168, Japanese


• 315 Moving Finite Element Analyses for Fracture with Large Deformation using Various Fracture Path Prediction Theories

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 02 Nov. 2006, The Computational Mechanics Conference, 2006(19) (19), 163 - 164, Japanese


• 316 Highly precise numerical simulation highly fracture path predictions of complicated dynamic fracture phenomenon using the moving finite element method based on delaunay automatic triangulation

  NISHIOKA Toshihisa, YAMAWAKI Teruaki, KOGAME Masahito, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 02 Nov. 2006, The Computational Mechanics Conference, 2006(19) (19), 165 - 166, Japanese


• 314 Simulation of Impact Fracture Using Moving Finite Element Method Based on Delaunay Automatic Mesh Generation

  NISHIOKA Toshihisa, FUJITA Noriko, FUJIMOTO Takehiro, KOGAME Masahito

  The Japan Society of Mechanical Engineers, 02 Nov. 2006, The Computational Mechanics Conference, 2006(19) (19), 161 - 162, Japanese


• 衝撃荷重偏心三点曲げ破壊試験のC.G.S.法観察 (〔日本実験力学会〕2006年度年次講演会)

  西岡 俊久, 小亀 正人, 藤本 岳洋

  日本実験力学会, 2006, 日本実験力学会講演論文集, (6) (6), 121 - 124, Japanese


• 724 Ultra high speed Observations of Dynamic Interfatial Crack-tip Propagation in Composite Materials

  NISHIOKA Toshihisa, ENDO Fumitaka, FUJIMOTO Takehiro

  The composite materials bonded some different materials may have cracks in their interface because of poor bonding, fatigue, and other factors. In the experiments for interfacial fracture under dynamic load, transonic crack propagations can be happened. In these phenomena, the crack propagation velocities exceed the shear wave velocity of the compliant side material. And, the contact of crack surfaces behind the propagating interfacial crack tip has been reported some experimental, analytical and numerical studies, In this study, we recorded interfacial transonic fractures phenomena and inclined fracture phenomena by ultra high-speed video camera. Based on the measurements of crack tip positions, the histories of crack propagating velocities could be estimated. And, we observed stress distributions near the crack tip in transonic fracture phenomena by the Caustics and C.G.S. method.

  The Japan Society of Mechanical Engineers, 18 Mar. 2005, 関西支部講演会講演論文集, 2005(80) (80), "7 - 47"-"7-48", Japanese


• Numerical simulation to predict dynamic fracture path in aluminum alloy

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 17 Nov. 2004, The Computational Mechanics Conference, 2004(17) (17), 89 - 90, Japanese


• Numerical Simulation to Predict Dynamic Fracture Path in Material with Circular Holes

  NISHIOKA Toshihisa, FUJIMOTO Takehiro, MARUOKA Atsushi

  The Japan Society of Mechanical Engineers, 17 Nov. 2004, The Computational Mechanics Conference, 2004(17) (17), 91 - 92, Japanese


• Hybrid analysis for near-field of crack tip using image correlation method and high performance of image correlation method

  NISHIOKA Toshihisa, FUKUMAN Satoshi, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 19 Mar. 2004, 日本機械学会九州支部講演論文集, 2004(57) (57), 47 - 48, Japanese


• Development of Numerical Simulation Technique on Kinking Fracture from Interfacial Cracks, and Consideration about Fracture Criterion of Interface

  NISHIOKA Toshihisa, NUKASAKA Takeshi, FUJIMOTO Takehiro

  In this study, the criteria of kinking fracture from interface in composite material is clarified, and the kinking fracture path prediction simulations are performed. As a fracture path prediction theory, the energy release rate maximum criterion is used. Consequently, kinked angle and the fracture path are very well in agreement with the previous experimental result. Based on the experimental and numerical results, the loading angle dependence of kinking fracture is discussed.

  The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 541 - 542, Japanese


• Moving Finite Element Method for Fracture Path Prediction in Materials Containing Inclusions and Voids of Mezzo scale

  NISHIOKA Toshihisa, KISHIMOTO Kengo, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 531 - 532, Japanese


• Numerical Simulation on Fracture Phenomena with Limiting Propagation Velocities

  NISHIOKA Toshihisa, FURUTA Hiroyuki, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 543 - 544, Japanese


• Numerical Prediction Analysis of the Dynamic Crack Branching Using Governing Criterion

  NISHIOKA Toshihisa, TCHOUIKOV Stanislav, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 529 - 530, Japanese


• Fast Crack Propagation Analysis in Thermo Elasto Visco Plastic Material under Fast Deformation Rate

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 22 Nov. 2003, The Computational Mechanics Conference, 2003(16) (16), 537 - 538, Japanese


• Notes from the Guest Editor

  NISHIOKA Toshihisa, FUJIMOTO Takehiro

  25 Sep. 2003, 実験力学 : journal of JSEM, 3(3) (3), 140 - 140, Japanese


• Numerical Simulation on Crack Acceleration Phenomena using Moving Finite Element Method

  NISHIOKA Toshihisa, FURUTA Hiroyuki, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 30 Oct. 2002, The Computational Mechanics Conference, 2002(15) (15), 653 - 654, Japanese


• Development of Numerical Simulation Method for Fracture Path Prediction of Curving Crack in Elastic-Plastic Materials Using the T^* Integral

  NISHIOKA Toshihisa, KOBAYASHI Yutaka, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 30 Oct. 2002, The Computational Mechanics Conference, 2002(15) (15), 657 - 658, Japanese


• Evaluation of governing condition for dynamic crack bifurcation using optical experimental method

  NISHIOKA Toshihisa, MATSUMOTO Kazunori, FUJIMOTO Takehiro, SAKAKURA Keigo

  05 Aug. 2002, 日本実験力学会研究発表講演会講演論文集, 2, 136 - 140, Japanese


• Development of Numerical Simulation Technique on Kinking Fracture from Interfacial Cracks

  NISHIOKA Toshihisa, NUKASAKA Takeshi, NISHIOKA Ryouta, FUJIMOTO Takehiro

  20 May 2002, 計算工学講演会論文集, 7(2) (2), 443 - 446, Japanese


• Fracture Path Prediction Simulations in Materials Containing Inclusions by Moving Finite Element Method

  NISHIOKA Toshihisa, KISHIMOTO Kengo, FUJIMOTO Takehiro

  20 May 2002, 計算工学講演会論文集, 7(2) (2), 447 - 450, Japanese


• 変形固体中を極限速度で進展する動的き裂の実験観察および数値シミュレーション (実験力学における計測・データ処理の問題点・ノウハウ・工夫)

  西岡 俊久, 藤本 岳洋, 坂口 巧人

  日本実験力学会, 2002, 日本実験力学会講演論文集, (2) (2), 7 - 12, Japanese


• 711 Numerical Simulations of Dynamic Interfacial Crack Problems Considering Frictionless Contact

  NISHIOKA Toshihisa, HU Qi hua, FUJIMOTO Takehiro

  In this paper, first, a moving finite element method was developed to analyze dynamic interfacial crack propagation. Contact elements were introduced to include the special properties of contact surface. And penalty method was applied for solving the contact matrix. Next, numerical results were presented for dynamic J integral during the transonic crack growth under shear-dominated loading. Frictionless crack face was considered. The solution predicted a non-zero energy release rate of dynamic interfacial problem when take crack face contact into account.

  The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "7 - 27"-"7-28", English


• 710 Analysis of In-Plane Intersonically Propagating Interface Crack with a Finite Contact Zone

  Yu Jia huan, NISHIOKA Toshihisa, FUJIMOTO Takehiro

  The report of Rosakis group has focused attention on steady-state intersonic interfacial crack growth accounting for crack face contact in elastic/rigid bimaterial but could not handle issues relating to energy transmission across the interface. The present paper derived a complete explicit expression of the asymptotic field induced by intersonically propagating interfacial crack in elastic bimaterial for in-plane case. The stress and displacement distribution on the contact area, crack tip and two singular characteristic lines are analyzed. The two-dimensional in-plane asymptotic deformation field surrounding the contact area of a crack propagating intersonically along an elastic/elastic bimaterial interface is observed.

  The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "7 - 25"-"7-26", English


• Development of Numerical Simulation Method for Fracture Path Prediction in Elastic-Plastic Materials Using the Path Independent T^* Integral

  NISHIOKA Toshihisa, KOBAYASHI Yutaka, FUJIMOTO Takehiro

  First, for growing cracks in elastic-plastic materials, several incremental variational principles are developed to satisfy the boundary conditions near newly created crack surfaces. Then using these variational principles, several types of moving finite element methods are formulated and developed, based on the Delaunay automatic triangulation. Furthermore, theoretical backgrounds on numerical prediction for fracture path of curving crack using T^* integral are explained. Using the automatic moving finite element method, fracture-path prediction simulations are carried out for various cases of mixed-mode elastic-plastic fracture. The numerical predicted fracture path agrees well with experimental one.

  The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "7 - 21"-"7-22", Japanese


• The Numerical Fracture Path Prediction Simulations for Cracks in Materials Containing Inclusions and Voids

  NISHIOKA Toshihisa, KISHIMOTO Kengo, FUJIMOTO Takehiro

  In this paper, fracture-path prediction simulations were carried out for cracks in elastic materials containing inclusions and voids, using the moving finite element method based on Delaunay automatic mesh generation was used. The fracture path in each step was determined by the maximum hoop stress criterion and the local symmetry criterion (K_=0 criterion). Both criteria predicted almost the same fracture paths. It was found that when the inclusions are harder than the matrix material, the crack advances avoiding the inclusions.

  The Japan Society of Mechanical Engineers, 2002, 機講論, 2002, "7 - 11"-"7-12", Japanese


• Generation Phase Simulation of Unsymmetrical Dynamic Branching Fracture

  NISHIOKA Toshihisa, TCHOUIKOV Stanislav, FUJIMOTO Takehiro

  The dynamic bifurcation fracture phenomenon is often observed in dynamic fast fracture. The authors have already succeeded to predict dynamic fracture paths in a symmetrical two crack branching phenomenon, using the moving finite element method based on Delaunay automatic mesh generation. In this paper, using an experimentally obtained history of unsymmetrical two crack branching fracture, the generation-phase simulation was carried out. Using the switching method of the path independent dynamic J integral, various fracture parameters were successfully estimated. From the generation phase-simulation, the behavior of the unsymmetrical two crack branching fracture is clarified.

  The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "7 - 3"-"7-4", Japanese


• Numerical Analysis of Elasto Visco-plastic Fracture with Large Deformation using Moving Finite Element Method

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  In numerical analyses of dynamic elasto visco-plastic fracture, the expressions of boundary conditions near the propagating crack tip are key-points for accurate simulation. To overcome difficulties in the numerical expressions near the propagating crack tip, the moving finite element technique is used in this study. At first, the variational principle to formulate the moving finite element method for crack propagation under dynamic elasto visco-plastic deformation is derived. Next, solutions are obtained based on the large deformation theory and the infinitesimal deformation theory, Dynamic elasto visco-plastic fracture mechanics parameter T^* integrals are estimated from these finite element solutions.

  The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "7 - 19"-"7-20", Japanese


• 704 Effects of Specimen Thickness on Three-Dimensional Dynamic Fracture Parameters

  NISHIOKA Toshihisa, STAN Felicia, FUJIMOTO Takehiro

  In this study, in order to account for the thickness effects, experimental investigation and finite element analysis have been carried out. The work described in this paper was motivated by the experimental observations i. e. (i) the curvatures of the dynamically propagating crack front in double cantilever beam specimen increase with the plate thickness, (ii) the dynamically propagating crack fronts in thinner specimen are almost straight. Depending on the speciment thickness, we discuss the variation of fracture parameters along the dynamically propagating crack front in double cantilever beam (DCB) specimens of PMMA.

  The Japan Society of Mechanical Engineers, 2002, 関西支部講演会講演論文集, 2002(77) (77), "7 - 7"-"7-8", English


• 147 Numerical Simulations of Fracture Paths in Unsymmetrical Dynamic Branching Fracture Phenomena

  NISHIOKA Toshihisa, TCHOUIKOV Stanislav, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 27 Nov. 2001, The Computational Mechanics Conference, 2001(14) (14), 93 - 94, Japanese


• 156 Development of Evaluation Method of Mixed-Mode Dynamic Stress Intensity Factors for Dynamically Propagating Interfacial Cracks in Composite Materials

  NISHIOKA Toshihisa, NISHIOKA Ryouta, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 27 Nov. 2001, The Computational Mechanics Conference, 2001(14) (14), 111 - 112, Japanese


• Toward the Developments of Intelligent Hybrid Methods for Full-Field Measurements

  NISHIOKA T., FUJIMOTO T.

  日本実験力学会, 26 Jun. 2001, Proceedings of JSEM, 1, 109 - 112, Japanese


• FRACTURE PATH PREDICTION SIMULATIONS OF DYNAMIC BIFURCATION FRACTURE PHENOMENA

  NISHIOKA Toshihisa, TCHOUIKOV Stanislav, FUJIMOTO Takehiro

  30 May 2001, 計算工学講演会論文集, 6(2) (2), 655 - 658, Japanese


• NUMERICAL SIMULATIONS OF FRACTURE PATHS IN STATIC AND DYNAMIC FRACTURE PHENOMENA

  NISHIOKA Toshihisa, HASHIMOTO Masanori, FUJIMOTO Takehiro

  30 May 2001, 計算工学講演会論文集, 6(2) (2), 651 - 654, Japanese


• 527 動的大変形を伴う高速き裂進展解析のための移動有限要素法の開発

  藤本 岳洋, 西岡 俊久

  日本材料学会, 2001, 学術講演会講演論文集, 50, 357 - 358, Japanese


• 528 混合モード三点曲げ衝撃破壊試験の数値予測シミュレーション

  西岡 俊久, 藤本 岳洋, 橋本 政典

  日本材料学会, 2001, 学術講演会講演論文集, 50, 359 - 360, Japanese


• 524 IMPACT INTERFACIAL FRACTURE SIMULATION :

  NISHIOKA Toshihisa, FUJIMOTO Takehiro

  日本材料学会, 2001, 学術講演会講演論文集, 50, 351 - 352, English


• 523 遷音速界面破壊現象のコースティック法による破壊力学パラメータ評価

  西岡 俊久, 宮内 秀実, 野崎 琢磨, 藤本 岳洋, 坂倉 慧悟

  日本材料学会, 2001, 学術講演会講演論文集, 50, 349 - 350, Japanese


• Numerical Prediction for Fracture Path of Curving Crack Using the Separated T^* Integral

  NISHIOKA Toshihisa, KOBAYASHI Yutaka, FUJIMOTO Takehiro

  The Japan Society of Mechanical Engineers, 27 Nov. 2000, The Computational Mechanics Conference, 2000(13) (13), 471 - 472, Japanese


• Numerical simulation of fracture phenomenon with elasto visco-plastic large deformation

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Japan Society of Mechanical Engineers, 27 Nov. 2000, The Computational Mechanics Conference, 2000(13) (13), 75 - 76, Japanese

• 衝撃工学の基礎と応用

  横山 隆, 西岡 俊久, FUJIMOTO TAKEHIRO

  Others, 共立出版株式会社, May 2014, Japanese

  Scholarly book

• き裂先端のストップホール施工とその近傍への面外応力作用による疲労き裂成長抑止効果の解明（数値解析による考察）

  川田 勇介, 横田 久弥, FUJIMOTO TAKEHIRO

  日本機械学会M&M2017材料力学カンファレンス, Oct. 2017, Japanese, Domestic conference

  Oral presentation


• き裂先端のストップホール施工とその近傍への面外応力作用による疲労き裂成長抑止効果の解明(実験による考察)

  横田 久弥, 川田 勇介, FUJIMOTO TAKEHIRO

  日本機械学会 M&M2017材料力学カンファレンス, Oct. 2017, Japanese, Domestic conference

  Oral presentation


• 衝突条件が後続のき裂進展挙動に及ぼす影響の考察

  石川 貴大, FUJIMOTO TAKEHIRO

  日本機械学会第30回計算力学講演会, Sep. 2017, Japanese, Domestic conference

  Oral presentation


• 各種衝撃破壊試験時の破壊抵抗に関する数値解析

  FUJIMOTO TAKEHIRO, 石橋 正晃

  日本機械学会第30回計算力学講演会, Sep. 2017, Japanese, Domestic conference

  Oral presentation


• 衝撃試験と数値解析を用いた破壊じん性評価法に関する研究

  石橋 正晃, FUJIMOTO TAKEHIRO, 松山 靖典

  日本機械学会M&M2016材料力学カンファレンス, Oct. 2016, Japanese, Domestic conference

  Oral presentation


• 傾斜衝突下の予き裂三点曲げ破壊試験片のき裂進展挙動解析

  石川 貴大, FUJIMOTO TAKEHIRO

  日本機械学会M&M2016材料力学カンファレンス, Oct. 2016, Japanese, Domestic conference

  Oral presentation


• 疲労き裂成長抑止・緩和法に関する数値シミュレーション

  FUJIMOTO TAKEHIRO, 島田 光平

  日本機械学会第29回計算力学講演会, Sep. 2016, Japanese, Domestic conference

  Oral presentation


• 衝突体中の動的破壊における打撃端形状依存性に関する研究

  石川 貴大, 小椋 隆寛, FUJIMOTO TAKEHIRO

  日本機械学会第29回計算力学講演会, Sep. 2016, Japanese, Domestic conference

  Oral presentation


• 数値解析による混合モード作用下疲労き裂成長の応力拡大係数評価

  高橋 明生, FUJIMOTO TAKEHIRO

  日本計算工学会第21回計算工学講演会, May 2016, Japanese, Domestic conference

  Oral presentation


• き裂進展経路予測理論によるぜい性材破壊挙動の評価

  三石 学, FUJIMOTO TAKEHIRO

  日本計算工学会第21回計算工学講演会, May 2016, Japanese, Domestic conference

  Oral presentation


• Mechanical evaluation of suppressing effect on fatigue crack growth by stopping holes

  YOKOO KAZUMA, FUJIMOTO TAKEHIRO

  日本機械学会M&M2015材料力学カンファレンス, Nov. 2015, Japanese, 慶応義塾大学矢上キャンパス, Lots of accident for industrial structures are caused by material fatigue. In some situations, detection of fatigue crack are required to prevent catastrophic accident. The stopping hole method is used as countermeasure for detected cracks. The stopping hole that is introduced in crack tip restrain stress concentration, and fatigue crack growth is delayed. However, stopping hol, Domestic conference

  Oral presentation


• Three Dimensions Moving Finite Element Analysis about Fracture Behavior from Various Initial Notch Diameters

  OKADA TERUAKI, KASHIHARA KAZUHITO, FUJIMOTO TAKEHIRO

  日本機械学会第28回計算力学講演会, Oct. 2015, Japanese, 横浜国立大学, 初期切り欠き径が破壊挙動に及ぼす影響を調べるため，破壊シミュレーションを開発した．様々な切り欠き径及び荷重条件下での破壊実験から得た結果に則したき裂進展を再現し，求められた動的J積分値等を評価する．, Domestic conference

  Oral presentation


• Moving Finite Element Analyses for Impact State Dependence of Gray Cast Iron Fracture Behavior

  KASAMI RYOSUKE, CHO KYUCHUN, FUJIMOTO TAKEHIRO

  日本機械学会第28回計算力学講演会, Oct. 2015, Japanese, 横浜国立大学, 構造物の破壊事故では過負荷や衝突により動的問題となることが多い．衝突面同士の剛性が拮抗する場合は，特に，衝突部付近の破壊挙動は複雑なものとなる．このような破壊が生じるケースでは，数値解析はより難度を増し，高精度評価のために境界条件を厳格に再現した解析を行う必要がある．そのため，これまでに本研究者らは，衝突時に衝突部を含む境界で起こりうる接触・非接触現象を力学的に判定，再現する機能を移動有限要素法に取り入れて解析を行っている．そして，鋳鉄製試験片に対して3点曲げ衝撃破壊実験を行い，ストライカーの剛性や衝突体の幾何学形状の違いにより，破壊時のき裂先端近傍の力学的状態が大きく異なるということを確認している(1)(2)．しかしストライカーの衝突速度の違いや，衝突面と初期き裂先端間の距離(以下，リガメントと記す)の違いがき裂先端近傍に及ぼす影響については，十分, Domestic conference

  Oral presentation


• Elastic Plastic Moving Finite Element Analyses for Fracture Behavior from Notch under Dynamic Three Point Bending Load

  FUJIMOTO TAKEHIRO, KASHIHARA KAZUHITO, OKADA TERUAKI

  日本機械学会第28回計算力学講演会, Oct. 2015, Japanese, 横浜国立大学, 近年，工業部材の加工に材料の破壊を利用する機会が増えつつある．このような用途では，破壊は肯定的事象であるが，破壊挙動の制御が求められることとなる．負荷量，負荷速度，初期切り欠き径，切り欠き長さ等が，破断加工時のき裂進展挙動に与える影響は大きいと考えられるが，その最適条件を破壊力学的なアプローチで評価した研究は多くはない． 本研究者らはこれまでコネクティングロッドの破断加工実験・数値解析を通じて破壊挙動の差異を調べている(1)(2)．その結果を踏まえて，更によりシンプルな破壊実験・数値解析を通じて破壊挙動を調べることとし，基本的な三点曲げ切り欠き試験片の破壊試験(3)を実施している．試験片材料は高脆材であるが，破壊実験時の塑性変形の発生は不可避である．これらの塑性変形の発生がき裂進展挙動に当たえる影響を調べるため，本研究では材料を粘弾塑性材とみなし，, Domestic conference

  Oral presentation


• Moving Finite Element Analyses for Brittle Metal Fracture; Dependence of Contact-Noncontact Condition, Shape of Strikers and Striker’s Materials

  KASAMI RYOSUKE, CHO KYUCHUN, FUJIMOTO TAKEHIRO

  日本計算工学会第20回計算工学講演会, Jun. 2015, Japanese, つくば国際会議場, Some dynamic collisions of structures cause fracture accident. Crack initiation may be caused in the immediate area of the impact points. In these cases, Fracture behavior is dependent on impact velocity and stiffness of structures. Comparable stiffness causes complex deformation behavior in each structure. In numerical analysis of these problems, contact-noncontact condition h, Domestic conference

  Oral presentation


• Dynamic fracture path evaluation in cast iron using three-dimensional moving finite element method

  OGURA TAKAHIRO, CHO KYUCHUN, FUJIMOTO TAKEHIRO

  日本計算工学会第20回計算工学講演会, Jun. 2015, Japanese, つくば国際会議場, Dependence of dynamic fracture path on loading velocity was observed from experimental results based on the three point bending fracture in cast iron. In this study, 3D and 2D numerical simulations are used to evaluate singular stress fields near crack tip and fracture mechanics parameters. Moving finite element technique, 2D and 3D Delauney automatic mesh generation and contac, Domestic conference

  Oral presentation


• Fracture Behavior Evaluation of Connecting Rod Using Three Dimensions Moving Finite Element Method

  OKADA TERUAKI, KASHIHARA KAZUHITO, FUJIMOTO TAKEHIRO

  日本計算工学会第20回計算工学講演会, Jun. 2015, Japanese, つくば国際会議場, In order to achieve weight saving and tighten structure, cracking process are applied in some industrial fields. However, optimum condition for the cracking process was not evaluated based on the fracture mechanics knowledge. The condition is determined by experience of engineer, then new trial and error is caused by alteration of product structure. The criterion for the cracki, Domestic conference

  Oral presentation


• Ultra-high speed photographing for fast fracture behaviour from various notch tip

  KASHIHARA KAZUHITO, FUJIMOTO TAKEHIRO

  日本機械学会関西支部第90期定時総会, Mar. 2015, Japanese, 京都大学桂キャンパス, 近年では，かち割り加工(クラッキング加工)や打ち抜き加工といった材料の切断，分離を伴う加工が多用されつつある．しかし，その加工条件の設定は当事者の経験に基づくことが多いが，完成品寸法や素材変更によって経験が利用できなくなるケースも発生している．そのため，材料学・力学的根拠に基づいた最適な材料切断条件の解明が望まれている． そこで，本研究では加工における材料破断制御に強く影響する因子を明らかにすることを第1の目的とし，破壊現象の再現性，一様性を調べた．炭素工具鋼SK85について様々な荷重負荷条件下，破壊試験片初期切り欠き径に対して破壊実験を行う．その際，超高速度撮影を用いて破壊挙動を可視化することで，高速き裂進展挙動の推移を明らかにし，破壊力学パラメータと破面形成の相関性を調べる．, Domestic conference

  Oral presentation


• Experimental research for fatigue crack growth of Inconel600

  SAWA MASAAKI, FUJIMOTO TAKEHIRO

  日本機械学会関西支部第90期定時総会, Mar. 2015, Japanese, 京都大学桂キャンパス, 現在，耐熱性，耐腐食性に優れた部材としてインコネル材の利用が進められている．しかし，その疲労き裂成長特性については十分には明らかにされていない．本研究ではインコネルの代表的な材種であるインコネル600を用い，構造物・機械での長期間使用を想定し，疲労破壊について調べる．実験では破壊じん性3点曲げ試験の規格に準じ，板厚については系統的に変化させた試験片（5，10，20，30mmこの厚さは板製品として供給されている）を用意し，疲労き裂成長挙動を観察し，疲労き裂の破面の算術平均粗さの評価を行った．また，インコネル600の疲労き裂成長特性と機械構造用鋼の相違点を調べるため，S55Cについても同厚，同寸法の試験片を用いて実験を行い，疲労き裂成長挙動の比較した．, Domestic conference

  Oral presentation


• Numerical analyses for condition of stop holes to prevent fatigue crack growth

  SHU CHI, YOKOO KAZUMA, FUJIMOTO TAKEHIRO

  第19回計算工学講演会, Jun. 2014, Japanese, 広島国際会議場, Defects on surface of structure are often caused by material fatigue. In order to prevent catastrophic accidents, repair to defects are treated as very important problem. Stop hole setting is one of repair for fatigue crack on sheet metal, and this is very easy method. However, standard for stop hole size is not established based on mechanics theory. In this study, authors demo, Domestic conference

  Oral presentation


• Moving finite element analyses for fatigue crack growth under mixed mode loading

  NAKADE TOMOHIRO, FUJIMOTO TAKEHIRO

  第19回計算工学講演会, Jun. 2014, Japanese, 広島国際会議場, Many industrial structures work under complex load. Some irregular loads cause cracks or defects in the structure. Then fatigue crack growth from these defects are caused under mixed mode. In these condition, undulated crack surfaces are generated by fatigue crack growth. Establishment for fatigue crack growth under mixed mode loading are required to improve damage control of m, Domestic conference

  Oral presentation


• Basic study for development of a dynamic intelligent hybrid method

  YAMADA MASAYOSHI, FUJIMOTO TAKEHIRO, NISHIOKA TOSHIHISA

  第26回計算力学講演会, Nov. 2013, Japanese, 佐賀大学大学院工学系研究科, Domestic conference

  Oral presentation


• Three-dimensional Moving Finite Element Analysis for Fracture Behavior of Connecting Rods

  MARUO KYOHEI, MURAKAMI TOMOHIRO, FUJIMOTO TAKEHIRO

  第26回計算力学講演会, Nov. 2013, Japanese, 佐賀大学大学院工学系研究科, Domestic conference

  Oral presentation


• Ultra-High Speed Observation for Fracture Behavior of Connecting Rods

  MURAKAMI TOMOHIRO, MARUO KYOHEI, FUJIMOTO TAKEHIRO

  第26回計算力学講演会, Nov. 2013, Japanese, 佐賀大学大学院工学系研究科, Domestic conference

  Oral presentation


• Experimental and Numerical Study on the Dynamic Fracture Characteristics of Grey Cast Iron FC200

  CHO KYUCHUN, SHIMOZONO CHIKARA, FUJIMOTO TAKEHIRO, NISHIOKA TOSHIHISA

  The 8th International Symposium on Impact Engineering, Sep. 2013, English, Osaka, Japan, Recently, some improvements of machine performance cause most accidents with impact fracture. These fractures were caused by unexpected dynamic load. To suppress the damage in the accidents, clarification of dynamic fracture mechanism is required, and many research reports are published for dynamic fracture phenomena. Cast iron is used for some structure and mechanical parts be, International conference

  Oral presentation


• A Study of The Material Heat Treatment and Multiple cracks Interaction Effect on Fatigue Growth of a Surface crack

  LEE HOYEON, FUJIMOTO TAKEHIRO, WON YOUNGJUN, NISHIOKA TOSHIHISA

  第25回計算力学講演会, Oct. 2012, Japanese, 神戸市, Domestic conference

  Oral presentation


• Analysis of Curve Front Crack Propagation using Three Dimensional Moving Finite Element Method Based on Delaunay Automatic Mesh Generation

  MATSUBARA HITOSHI, FUJIMOTO TAKEHIRO, NISHIOKA TOSHIHISA

  第25回計算力学講演会, Oct. 2012, Japanese, 神戸市, Domestic conference

  Oral presentation


• 衝撃荷重下における動的き裂分岐現象に関する基礎的研究

  NISHIOKA TOSHISHIA, NEGISHI YUTA, FUJIMOTO TAKEHIRO

  第87期定期総会講演会, Mar. 2012, Japanese, 日本機械学会関西支部, 関西大学, Domestic conference

  Oral presentation


• Study on Brittle Fracture of Cast Iron Induced by Thermal Stress

  IKENISHI KENJI, NISHIOKA TOSHIHISA, FUJIMOTO TAKEHIRO, KOMARU YUKITO, TSURU HIDETO

  The 9th International Symposium on Marine Engineering, Oct. 2011, English, The Japan Institution of Marine Engineering, Kobe, Japan, Because the cast iron can be superior to casting characteristics, it is used for the materials of the casing of motors and pumps. In addition, the cast iron is used for cylinder liner and a piston exposed in a high temperature because strength does not deteriorate even if the cast iron becomes the high temperature. In parts made by cast iron, damage examples of brittle fracture, International conference

  Oral presentation


• Fracture Toughness Evaluation of Mixed - Type Adhesive Material for LNG Ship Tank

  NISHIOKA TOSHIHISA, CHO KYUCHUN, FUJIMOTO TAKEHIRO

  The 9th International Symposium on Marine Engineering, Oct. 2011, English, The Japan Institution of Marine Engineering, Kobe, Japan, An LNG ship is a ship that transports liquefied natural gas. The inner plate in the LNG tank is kept at a low temperature because the natural gas liquefies at −164.5˚C or less, but the outside plate of the tank is at almost the same temperature as the outside temperature because it is aerated. This difference in temperature between the two plates can cause, the mixed-type adhes, International conference

  Oral presentation


• Experimental study on thermal stress fracture problem using image correlation method

  NISHIOKA TOSHIHISA, KOMARU YUKITO, IKENISHI KENJI, TSURU HIDETO, FUJIMOTO TAKEHIRO

  ATEM '11, Sep. 2011, English, The Japan Society of Mechanical Engineers, Kobe, Japan, Fracture mechanics is a discipline that originated from the need to prevent accidents and the experience of many unexpected structure failures. In a structure failure, there are many cases where an accident is caused by a crack that forms and propagates because of internal defects. In the case of an engine and high-speed rotation equipment, the safety design may receive a load, International conference

  Oral presentation


• Evaluation of Interacting Semi-elliptical Surface Cracks of Mechanical Structural Components Using VNA Solution

  NISHIOKA TOSHIHISA, NOGAMI TATSUYA, FUJIMOTO TAKEHIRO

  ATEM '11, Sep. 2011, English, The Japan Society of Mechanical Engineers, Kobe, Japan, Highly precise evaluations of the stress intensity factor are necessary for the prediction of growth and instable fractures of the cracks in mechanical structural components. Generally, crack shape that exists in three-dimensional mechanical structural components can often be approximated as an elliptical crack or part of an elliptical crack. However, it is difficult for a high, International conference

  Oral presentation


• Derivation of Path Independent Integral on Heat Conduction Field

  NISHIOKA TOSHIHISA, ASAI YUICHI, FUJIMOTO TAKEHIRO

  日本機械学会関西支部 第85期定期総会講演会, Mar. 2010, Japanese, 神戸大学, Domestic conference

  Oral presentation


• 高偏心衝撃荷重下における破壊挙動の移動有限要素解析

  NISHIOKA TOSHIHISA, FUJIOKA TAKANORI, FUJIMOTO TAKEHIRO

  日本機械学会関西支部 第85期定期総会講演会, Mar. 2010, Japanese, 神戸大学, Domestic conference

  Oral presentation


• Analyses of complex deformation behavior in metal using Distinct Element Method

  NISHIOKA TOSHIHISA, NAKANO YUU, FUJIMOTO TAKEHIRO

  日本機械学会関西支部 第85期定期総会講演会, Mar. 2010, Japanese, 神戸大学, Domestic conference

  Oral presentation


• The contact load value evaluation using caustics method

  NISHIOKA TOSHIHISA, GOAMI KEISUKE, KUMURA TADASHI, KANATANI KENSHIROU, FUJIMOTO TAKEHIRO

  日本機械学会関西支部 第85期定期総会講演会, Mar. 2010, Japanese, 神戸大学, Domestic conference

  Oral presentation


• Simulation Using a Moving Finite Element Method of Experiment for Semistatic Curving Crack Propagation Using C.G.S. Method

  NISHIOKA TOSHIHISA, NODA KENSUKE, FUJIMOTO TAKEHIRO

  日本機械学会関西支部 第85期定期総会講演会, Mar. 2010, Japanese, 神戸大学, Domestic conference

  Oral presentation


• Strength Evaluation on Marine Crane-hook by Static-load Fatigue Experiments

  NISHIOKA TOSHIHISA, LEE HOYEON, WON YOUNGJUN, FUJIMOTO TAKEHIRO, FUKUI TADAHISA, KURODA SHIGEYUKI

  International Symposium on Marine Engineering 2009, Oct. 2009, English, Busan, Korea, International conference

  Oral presentation


• Moving finite element simulation for crack propagation with elastic-plastic deformation in three point bending specimens

  FUJIMOTO TAKEHIRO, NISHIOKA TOSHIHISA

  International Symposium on Marine Engineering 2009, Oct. 2009, English, Busan, Korea, In this study, the moving finite element method based on the Delaunay automatic triangulation is used to simulate crack propagation phenomena in aluminum alloy specimens. In aluminum alloy, distinct elastic-plastic deformation are appeared in the crack tip near field, in which singularity of deformation are caused. Fracture behaviors in three point bending specimens are observ, International conference

  Oral presentation


• Numerical simulation of fracture path prediction for stress corrosion cracking

  NISHIOKA TOSHIHISA, NIWA HAYATO, FUJIMOTO TAKEHIRO

  M&M2009 カンファレンス, Jul. 2009, Japanese, 日本機械学会, 札幌, Domestic conference

  Oral presentation


• アルミニウム合金破壊挙動の衝撃速度依存性に関する研究

  FUJIMOTO TAKEHIRO, NISHIOKA TOSHIHISA

  M&M2009 カンファレンス, Jul. 2009, Japanese, 日本機械学会, 札幌, Fracture toughness KIC or JIC is generally used as criterion for safety design. These criteria are defined under plane strain condition. Shear lips on crack surface is caused in case of thin plates fracture. Therefore, fracture mechanism in thin plates is not clarified. And some of these fracture behavior depends on loading speed. In this study, three point bending fracture ex, Domestic conference

  Oral presentation


• Highly precise numerical simulation highly fracture path predictions of complicated dynamic fracture phenomenon using the moving finite element method based on delaunay automatic triangulation

  Toshihisa NISHIOKA, Teruaki Yamawaki, Masahito Kogame, Takehiro Fujimoto

  JSME 19th Computational Mechanics Conference, Nov. 2006, Japanese, 日本機械学会, Higashiyama-Campus, Nagoya Univ., Chikusa-ku, Nagoya, Domestic conference

  Oral presentation


• Simulation of Impact Fracture Using Moving Finite Element Method Based on Delaunay Automatic Mesh Generation

  Toshihisa NISHIOKA, Noriko Fujita, Takehiro Fujimoto

  JSME 19th Computational Mechanics Conference, Nov. 2006, Japanese, 日本機械学会, Higashiyama-Campus, Nagoya Univ., Chikusa-ku, Nagoya, Domestic conference

  Oral presentation


• Moving Finite Element Analyses for Fracture with Large Deformation using Various Fracture Path Prediction Theories

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  JSME 19th Computational Mechanics Conference, Nov. 2006, Japanese, 日本機械学会計算力学会, Higashiyama-Campus, Nagoya Univ., Chikusa-ku, Nagoya, International conference

  Oral presentation


• Moving Finite Element Simulation of Fracture Path Predictions Dynamic Fracture and Fatigue Crack Propagation in Materials Containing Holes

  Toshihisa NISHIOKA, Mayuko Masugami, Won Young Jun, Takehiro Fujimoto

  日本機械学会第19回計算力学講演会, Nov. 2006, Japanese, 日本機械学会, 名古屋大学東山キャンパス, Domestic conference

  Oral presentation


• Numerical Simulation of Nonlinear Crack Propagation in Pure Aluminum under Mixed-Mode Impact Loading

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  The ECF16 Conference, Jul. 2006, English, EMMANUEL E. GDOUTOS, Democritus University of Thrace, Greece, Alexandroupolis，Ｇｒｅｅｃｅ, International conference

  Oral presentation


• C.G.S. Observations of Three Points Bending Fracture under Impact Load

  NISHIOKA Toshihisa, Masahito Kogame, Takehiro Fujimoto, Keigo SAKAKURA

  2006 JSEM Annual Conference on Experimental Mechanics, Mar. 2006, Japanese, 日本実験力学会, Chubu University, Kasugai, Aichi, Domestic conference

  Oral presentation


• Numerical Simulation of Impact Transonic and Supersonic Fracture of Crack Propagating along the Diagonal Interface

  Toshihisa NISHIOKA, Tooru TSUDA, Takehiro FUJIMOTO

  International Conference on Computational & Experimental Engineering and Sciences, ICCES’05, Dec. 2005, English, ICCES Organizing Committee, Chennai, India, International conference

  Invited oral presentation


• Fracture Path Prediction Simulations of Dynamic Nonlinear Fracture in Pure Aluminum Specimen

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  International Conference on Computational & Experimental Engineering and Sciences, ICCES’05, Dec. 2005, English, ICCEES Organizing Committee, Chennai, India, International conference

  Invited oral presentation


• Fracture-Path Prediction SImulations in Elastic-Plastic Materials based on Incremental Variational Principle

  Toshihisa NISHIOKA, Yutaka KOBAYASHI, Takehiro FUJIMOTO

  International Conference on Computational & Experimental Engineering and Sciences, ICCES’05, Dec. 2005, English, ICCES Organizing Committee, Chennai, India, International conference

  Invited oral presentation


• Dynamic Fracture Path Prediction Simulation for the Materials and Structures Containing Circular Holes and Inclusions

  Toshihisa NISHIOKA, Atsushi MARUOKA, Takehiro FUJIMOTO

  International Conference on Computational & Experimental Engineering and Sciences, ICCES’05, Dec. 2005, English, ICCEES Organizing Committee, Chennai, India, International conference

  Invited oral presentation


• Analysis of Semicircular Surface Crack in Finite Plate Using the General Solution of Circular Crack

  Toshihisa NISHIOKA, Guangqin SHU, Takehiro FUJIMOTO

  International Conference on Computational & Experimental Engineering and Sciences, ICCES’05, Dec. 2005, English, ICCEES Organizing Committee, Chennai, India, International conference

  Invited oral presentation


• Effectiveness of Crack Arrester in Dynamic Crack Propagation

  Toshihisa NISHIOKA, Atsushi MARUOKA, Takehiro FUJIMOTO

  The 10th Conference on Computational Engineering and Science, May 2005, Japanese, THE JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE, National Olympic Memorial Youth Center, Domestic conference

  Oral presentation


• Development of Numerical Simulation Method for Fracture Path Prediction in Elastic-Plastic Materials base on Incremental Variational Principle

  Toshihisa NISHIOKA, Yutaka KOBAYASHI, Takehiro FUJIMOTO

  The 10th Conference on Computational Engineering and Science, May 2005, Japanese, The Japan Society for Computational Engineering and Science, National Olympic Memorial Youth Center, Domestic conference

  Oral presentation


• Numerical Simulations for Nonlinear Fast Crack Propagation under Dynamic Load

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  Proceedings of the 10th Conference on Computational Engineering and Science, May 2005, Japanese, 日本計算工学会, National Olympic Memorial Youth Center, Tokyo, Domestic conference

  Oral presentation


• Analysis about an Object Including Penny-Shaped Cracks

  Toshihisa NISHIOKA, Guangqin SHU, Takehiro FUJIMOTO

  The 10th Conference on Computational Engineering and Science, May 2005, Japanese, The Japan Society for Computational Engineering and Science, National Olympic Memorial Youth Center, Domestic conference

  Oral presentation


• Numerical Simulation of Impact Transonic Interfacial Fracture with rushing into the Heterogeneous Slanting Interface

  Toshihisa NISHIOKA, Tooru TSUDA, Takehiro FUJIMOTO

  the 10th Conference on Computational Engineering and Science, May 2005, Japanese, The Japan Society for Computaional Engineering and Science, National Olympic Memorial Youth Center, Domestic conference

  Oral presentation


• Numerical Simulation of Dynamic Elasto Visco-plastic Fracture Using Mesh Extension Method

  Takehiro FUJIMOTO, Toshihisa NISHIOKA

  Workshop on Development and Advancement of Computational Mechanics, (In Celebrating Professor Satya N. Atluri’s 60th Anniversary), Apr. 2005, English, 西岡 俊久 他, 村川 英一, International Conference Center Kobe, International conference

  Oral presentation


• Quantitative Measurement of Slant Crack Propagation in Aluminum Alloy 5052

  Takehiro FUJIMOTO, Hiroaki NAO, Toshihisa NISHIOKA

  2005 JSEM Annual Conference on Experimental Mechanics, Mar. 2005, Japanese, 日本実験力学会, Lecture Hall at Noda Campus, Tokyou University of Science, Noda city, Chiba, Domestic conference

  Oral presentation


• 同質材界面き裂破壊メカニズム解明のための実験観察

  西岡 俊久, 松本 和典, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.03-11,pp.843-844, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• 動的き裂分岐現象の数値予測シミュレーション

  西岡 俊久, チュイコフスタ ニスラフ, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.03-26,pp.529-530, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• 静的複数荷重システムによる高速き裂進展現象に関する研究

  西岡 俊久, 山口 健, 坂口 巧人, 古田 寛之, 坂倉 彗悟, 藤本 岳洋

  日本実験力学会ワークショップ2003「実験力学における計測・データ処理の問題点・ノウハウ・工夫」講演論文集 pp.22-27, 2003, Japanese, 未記入, 未記入, Domestic conference

  Oral presentation


• 高速扁形下の熱弾粘塑性材中の高速き裂進展数値解析

  藤本 岳洋, 西岡 俊久

  日本機械学会計算力学部門講演会講演論文集 No.03-26,pp.537-538, 2003, Japanese, 日本機械学会計算力学部門, 未記入, Domestic conference

  Oral presentation


• 均質固体中における遷音速破壊に関する基礎研究

  西岡 俊久, 坂口 巧人, 藤本 岳洋, 坂倉 彗悟

  日本機械学会材科力学部門講演会講演論文集 No.03-11,pp.861-862, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• 極限速度高速破壊現象の数値シュミレーション

  西岡 俊久, 古田 寛之, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.03-26,pp.543-544, 2003, Japanese, 日本機械学会材科力学部門, 未記入, Domestic conference

  Oral presentation


• 界面屈折破壊に関する数値シュミレーション手法の開発および界面の破壊基準についての考察

  西岡 俊久, 糠坂 岳, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.03-26,pp.541-542, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• 延性材料における混合モード荷重下のき裂進展現象の観察

  藤本 岳洋, 直 広明, 岡 総一郎, 西岡 俊久, 坂倉 彗悟

  日本実験力学会ワークショップ2003「実験力学における計測・データ処理の問題点・ノウハウ・工夫」講演論文集 pp.33-36, 2003, Japanese, 日本実験力学会, 未記入, Domestic conference

  Oral presentation


• 異材界面き裂先端近傍の小領域・微視領域観察

  西岡 俊久, 遠藤 史崇, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.03-11,pp.845-846, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• メゾスケールでの介在物・空孔を含む材料に対する移動有限要素法によるき裂進展経路予測シミュレーション

  西岡 俊久, 岸本 健吾, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.03-26,pp.531-532, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• デジタル画像相関法によるき裂材の大変形の計測

  西岡 俊久, 福万 智, 藤本 岳洋

  日本機械学会材科力学部門講演会講演論文集 No.13,pp.833-834, 2003, Japanese, 日本機械学会材料力学部門, 未記入, Domestic conference

  Oral presentation


• Fracture Path Predictions using Numerical Simulations for Dynamic Thermo Elasto Visco Plastic Fracture

  FUJIMOTO Takehiro, NISHIOKA Toshihisa

  The Proceedings of ICCES 2003(International Conference on Computational Engineering and Science,Corfu,Greece) Chapter11,No.433,6p, 2003, English, 未記入, 未記入, International conference

  Oral presentation

• Elucidation of the removing mechanism of marine organisms stuck to structure using cavitation jets and development of a nozzle expanding the removal effect area

  阿部 晃久, 藤本 岳洋, 公江 仁一, 三村 治夫

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2023 - 31 Mar. 2027


• Elucidation of the removing mechanism of marine organisms stuck to structure using cavitation jets and development of a nozzle expanding the removal effect area

  阿部 晃久, 藤本 岳洋, 公江 仁一, 三村 治夫

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2023 - 31 Mar. 2027


• キャビテーション噴流による水中衝撃波の生成・制御に関する研究：舶用技術への新展開

  阿部 晃久

  科学研究費補助金／基盤研究(B), Apr. 2016 - Mar. 2020

  Competitive research funding


• 舶用技術展開のための水中衝撃波コンバーターの開発

  阿部 晃久

  学術研究助成基金助成金／挑戦的萌芽研究, Apr. 2016 - Mar. 2019

  Competitive research funding


• 超高速度撮影および高精度数値解析を駆使した破壊制御評価法に関する基礎研究

  藤本 岳洋

  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


• メゾ・マクロスケールシミュレーションを駆使した非線形破壊クライテリオンの構築

  藤本 岳洋

  科学研究費補助金／若手研究(B), 2007, Principal investigator

  Competitive research funding


• 三次元弾塑性傾斜破壊現象の高精度有限要素解析

  藤本 岳洋

  科学研究費補助金／若手研究(B), 2005, Principal investigator

  Competitive research funding


• Fundamental Studies on the Limiting Velocity of Fast Dynamic Fracture in Solids

  NISHIOKA Toshihisa, FUJIMOTO Takehiro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 2002 - 2004

  In experimental aspect, using the presently developed spring constraint loading machine, dynamic fracture tests in homogeneous materials were carried out. As the results, a limiting fast fracture that exceeds 75% of the shear wave velocity c_s of the material was successfully recorded by the presently developed world most advanced ultrahigh-speed video camera system (maximum framing rate : one million frames per second, 10 ns pulse exposure time) this fracture velocity exceeds the limiting crack velocity predicted by the near-tip singular stress field theory. However, taking account of the higher order terms of the near-tip stress field It was theoretically proved that the ultrahigh-sped straight fracture of.75^c_s is possible.to occur Furthermore, relation ship between crack-tip total energy flow flux (ψ_ total energy flux in to the propagating crack tip per unit time) and fracture surface roughness was clarified. It was found that the fracture surface roughness increases for increasing ψ_. Fracture surface roughness may triggers dynamic crack branching fracture. The governing condition of dynamic crack branching has been a long-term unsolved problem for humankind. In our previous experimental studies, we have proved the critical crack-tip total energy flow flux criterion (dynamic two crack branching occurs when the crack-tip total energy flow flux ψ_ total exceeds a critical material value) In our laboratory, very versatile moving finite element method based on Delaunay automatic triangulation (MFEMBOAT) has been developed. Using MFEMBOAT, dynamic multiple crack branching phenomena was firstly succeeded. The simulation results proved the critical crack-tip total energy flow flux criterion is also valid for the dynamic multiple crack branching. Keywords : (1) 2),(3)Coherent Gradient Sensing(CGS)Method, (4)Ultrahigh-speed Video camera, (5)Transonic I Interface Fracture, (6)Mach Shock wave, (7)1High Energy Impact Fracture Testing Machine


• 並列コンピュータによる大変形弾塑性破壊のき裂進展経路予測数値シミュレーション

  藤本 岳洋

  日本学術振興会, 科学研究費助成事業, 若手研究(B), 神戸大学(海事科学部), 2002 - 2003

  本年度は,1.材料内の熱発生・温度上昇を考慮した大変形破壊の数値シミュレーション,2.アルミ合金中央貫通き裂試験片の混合モード破壊実験,3.同実験の生成系数値シミュレーション・き裂進展経路数値予測シミュレーション,4.変形体表面の変位分布計測用のデジタル画像相関法の高精度・効率化,5.き裂進展予測プログラムの計算並列化に取り組んだ. 1については,塑性仕事が熱変換するものと仮定し,材料構成式の温度依存性を考慮して高速き裂進展挙動をシミュレートした.その結果から,熱発生を考慮した場合,準展き裂先端近傍局所では顕著な温度上昇がみられるものの,この温度上昇は巨視的な破壊現象にはあまり影響を及ぼさないことが明らかになった. 2では,中央貫通き裂試験片の混合モード破壊実験を行った.その結果,破壊開始直後き裂は若干不安定な進展履歴を示すこともある・大局的にはモードI支配型破壊が生じる方向にき裂が進展することが明らかになった.さらに本実験に対する生成形数値シミュレーション{項目3}では,破壊力学パラメータの推移を明らかにし,T^*積分による破壊経路予測が妥当であることを明らかにできた.さらにき裂進展経路予測数値シミュレーションを行い,実験とよく一致したき裂進展経路を数値的に予測することに成功している. 4のデジタル画像相関法では,実際の破壊実験のランダムパターン像を用いて変位分布を評価し,画像相関法-有限要素解析ハイブリッド法を開発・適用することにより,き裂先端近傍応力特異場を高精度で評価することに成功した.さらに画像相関プログラムの演算短縮化にも成功している.5については並列計算プログラムのプロトタイプを作成している.その演算効率については今後,学会にて講演,論文を投稿する予定である.


• Fundamental Study on Application-Phase Numerical Prediction Method for Dynamic Fracture Propagation Paths

  NISHIOKA Toshihisa, FUJIMOTO Takehiro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 2000 - 2001

  In this research project, fundamental studies were carried out mainly for the following items : (1) development of application-phase simulation methodology for dynamic fracture path prediction, and (2) development of dynamic branching fracture path prediction methodology. These studies were performed by using experimental, theoretical and computational mechanics approaches in a unified fashion. Through these investigations, fundamental information and data on dynamic fracture phenomena were acquired. Furthermore, some mechanisms of dynamic fracture phenomena were clarified. The major research results of this project are listed as follows : 1. Experimental Studies : (1) Elucidation of the governing condition for dynamic branching fracture (2) Development of the theory of caustics for transonic interfacial fracture (3) Developments of various intelligent hybrid measurement methods automatically detecting and eliminating experimental measurement erros (4) Development of the minimum correlation coefficient searching method for full-field measurement image correlation method (5) elucidation of correlation between the dynamic crack-tip energy flux and fracture surface coarseness (6) Measurements of the stress singularity field factor and the singularity order for transonically propagating crack tips 2. Theoretical Studies (1) Derivation of a unified asymptotic solution for dynamic interfacial fracture (2) Development of the switching method of the path independent dynamic J integral for dynamically branched cracks (3) Derivation of the dynamic J integral for piezoelectric materials (4) Derivation of the asymptotic crack tip near field solution for piezoelectric materials (5) Development of the component separation method for extracting mechanical mixed-mode stress intensity factors and the electric displacement intensity factor. (6) Derivation of the variational principle for carack growth problems 3. Computational Mechanics Studies : (1) Developments of various moving finite element methods based on Delaunay automatic mesh generation (2) Success of numerical path perediction simulations of dynamnic branching fracture (3) Success of the application-phase simulations of dynamic fracture phenomena under constant crack acceleration (4) Evaluation of the dynamic J integrals and the stress intensity factors for naturally and dynamically propagating crack fronts (5) Development of nonlinear dynamic fracture simulation methodology (6) Development of simulation methodology for transonic interfacial fracture with crack-face contact (7) Elucidation of the formation mechanism of three-dimensional dynamic fracture front Since the above research results include many important items, the outcomes of this research project can be expected to contribute to the advancement of dynamic fracture mechanics. For the present and related achievements, the following awards have been offered. (1) JSME Materials and Mechanics Achievement Award, (2) The JSME Award for Best Paper, (3) JSME Computational Mechanics Achievement Award, (4) JSMS Impact Division Achievement Award, (5) SEM Hetenyi Award