動的破壊伝播経路の応用形数値予測法の基礎研究

2001 Fiscal Year Annual Research Report

• Project/Area Number: 12450051
• Research Institution: Kobe University
• Principal Investigator: 西岡 俊久 神戸商船大学, 商船学部, 教授 (60018067)
• Co-Investigator(Kenkyū-buntansha): 藤本 岳洋 神戸商船大学, 商船学部, 講師 (60314514)
• Keywords: 動的破壊 / 衝撃破壊 / 動的破壊経路予測 / 動的き裂伝播および停止予測 / 動的き裂分岐予測 / 経路独立動的J積分 / スィッチング法 / 自動移動有限要素法

Research Abstract

高速曲進破壊経路予測応用形シミュレーション実施:
前年度開発したプログラムにより、高速曲進破壊経路予測応用形シミュレーションを実行した.ビデオ編修装置により、シミュレーションによる動的破壊伝播の様相を動画化し、高速度連続写真と比較して対応の詳細を明らかにした。これらにより、き裂加速度一定場では応用形クライテリオンとして,動的き裂伝播一定説で実験の動的破壊履歴と極めて良く一致する,シミュレーション結果をえることができた.
破面観察および検証実験
前年度および今年度実施される動的破壊実験の試験片について、走査型電子顕微鏡により、破面の三次元粗さ測定や介在物元素素分析などを調べた.これにより、動的破壊現象のメカニズムとの関連を明らかにした。具体的には,
また、前年度と異なる動的破壊実験に対して、本研究で開発した動的破壊経路予測シミュレーション手法が実際に有効に実験結果を予測、再現できるかなどの確認のため、シミュレーションで予測した条件と同じ実験を行う。破面の三次元粗さとき裂先端へのエネルギー流入束に比例関係があることを明らかにした.
高速分岐応用型シミュレーション開発および実施:
本研究者らは,すでに動的き裂分岐の支配条件として,プロセスゾーン臨界エネルギー流入束条件を明らかにした.すなわち,動的き裂分岐はき裂先端への単位時間当たりのエネルギー流入が材料固有の臨界値に達した時生じることを解明した.
ここでは,実験で得られた臨界エネルギー流入束条件と物体形状、材料定数、境界条件、初期条件、破壊靱性値を与えるだけで動的分岐破壊経路の予測を可能にする手法を開発した。これにより,対称2本分岐破壊に対しては,実験と一致するシミュレーション結果が得られた.

Research Products

• [Publications] T.Nishioka, H.Tokudome, M.Kinoshita: "Dynamic Fracture-Path Prediction in Impact Fracture Phenomena Using Moving Finite Element Method Based on Delaunay Automatic Mesh Generation"International Journal of Solids and Structures. Vol.38, No. 30-31. 5273-5301 (2001)
• [Publications] Nishioka, T., Ikekita, H., Tamai, K., Kobayashi, N.: "An Incremental Variational Principle Minimizing Experimental Measurement Errors and Its Application to an Intelligent Hybrid Experimental-Numerical Method (Case of Nonlinear Elastic-Plastic Deformation Field)"JSME International Journal, Series A. Vol.44, No.1. 71-81 (2001)
• [Publications] 西岡俊久, 藤本岳洋, 小林直樹, 栗尾耕介: "実験計測誤差を自動検出・自動消去するインテリジェントハイブリッド法の実証的研究(弾塑性変形場の場合)"日本機械学会論文集(A編). 67 巻 655 号. 424-431 (2001)
• [Publications] T.Nishioka, S.Shen: "Higher order asymptotic solution for an interfacial crack in piezoelectric bimaterial under impact"Materials Science Research International. Vol.7, No.3. 157-165 (2001)
• [Publications] T.Nishioka, S.P.Shen, A.Yasin, T.Fujimoto: "Experimental, Mathematical, and Computational Studies on Dynamic Interfacial Fracture Phenomena under Impact", (Invited Paper)"Journal of Materials Processing Technology, Special Issue THERMEC 2000 (Eds : T. Chandra, K. Higashi, C. Suryanarayan and C. Tome), Elsevier Science, UK.. Vol 117/3, CDROM, Section B9, Paper 2. 1-6 (2001)
• [Publications] T.Nishioka, S.Tchouikov, J.Furutuka, T.Fujimoto: "Fracture Path Prediction simulations of Dynamic Fracture Phenomena"Materials Science Research International, Special Technical Publication-1, The Society of Materials Science, Japan. 169-176 (2001)
• [Publications] T.Nishioka: "Dynamic Fracture Responses of Brittle Solids under Impact Loading (Invited Lecture)"Bi-National Israel-Japan Conference on "Dynamic Response of Brittle Solids", Neve-Ilan, Israel. January 28-30. 1-6 (2001)
• [Publications] Nishioka, T., Hu, Q.H., Fujimoto, T.: "Numerical Simulations of Dynamic Interfacial Fracture Phenomena"The 10th International conference on Fracture, Honolulu, Hawaii. December 3-7. (2001)
• [Publications] T.Nishioka: "Hybrid Methods Combining Computational Methods and Experimental Measurements for Dynamic Fracture Studies"Computational Methods and Experimental Measurements X, (Y.Villacampa Esteve, G.M. Carlomagno and C.A. Brebbia, Editors), WIT Press. 525-534 (2001)
• [Publications] 西岡俊久, 藤本岳洋, 西岡良太: "インテリジェントハイブリッド法による界面き裂近傍場の計測"日本機械学会論文集. 67 巻 659 号. 1186-1193 (2001)
• [Publications] T.Nishioka, F.Stan, T.Fujimoto: "Dynamic J Integral Distributions along Dynamically Propagating Three-Dimensional Fracture Fronts"Proceedings of Asian Pacific Conference on Fracture and Strength and International Conference on Advanced Technology in Experimental Mechanics, Sendai, Japan. October 20-22. 724-729 (2001)
• [Publications] J.L.Yao, T.Nishioka, T.Fujimoto: "Experimental and Numerical Studies on Crack Kinking Phenomena in Bimaterial Specimens"Proceedings of Asian Pacific Conference on Fracture and Strength and International Conference on Advanced Technology in Experimental Mechanics, Sendai, Japan. October 20-22. 712-717 (2001)
• [Publications] T.Nishioka, Q.H.Hu, T.Fujimoto: "Generation-Phase Simulation of Dynamic Interfacial Fracture under Impact Loading", (Invited Presentation)"Impact Engineering and Application, (A. Chiba, S. Tanimura and K. Hokamoto, editors), Elsevier Science. Volume I. 381-388 (2001)
• [Publications] T.Fujimoto, T.Nishioka: "Dynamic Elasto-Visco-Plastic Crack Propagation Analysis Using Moving Finite Element Method"Impact Engineering and Application, (A. Chiba, S. Tanimura and K. Hokamoto, editors), Elsevier Science. Volume I. 389-394 (2001)
• [Publications] 西岡俊久: "移動有限要素法による動的破壊における材料分離解析"日本塑性加工学会第29回FEMセミナー「破壊による材料分離シミュレーションの現状と展望」,(招待講演). 4. 11-20 (2001)
• [Publications] 西岡俊久, 橋本政典, 藤本岳洋: "静的および動的破壊現象の破壊経路予測数値シミュレーション"計算工学会講演会論文集. 第 6 巻 第 2 号. 651-654 (2001)
• [Publications] 西岡俊久, S.Tchouikov, 藤本岳洋: "動的分岐破壊現象の破壊経路予測数値シミュレーション"計算工学会講演会論文集. 第 6 巻, 第 2 号. 655-658 (2001)
• [Publications] 西岡俊久: "最近のハイブリッド法とその応用例"日本実験力学会誌. Vol.1,NO.2. 2-7 (2001)
• [Publications] Nishioka, T.: "Recent Developments in Dynamic Fracture Studies (Keynote Lecture)"Lectures in Numerical Simulation in Engineering, (A. Lungu, editor), Editura Academica. 9-29 (2001)
• [Publications] Nishioka, T., Stan, F, Fujimoto, T.: "Modeling of Three-Dimensional Dynamic Crack Propagation Using Moving Finite Element Method"Lectures in Numerical Simulation in Engineering, (A. Lungu, editor), Editura Academica. 51-60 (2001)
• [Publications] Nishioka, T.: "Recent Theoretical and Computational Studies on Dynamic Fracture Phenomena, (Keynote Lecture)"Advances in Computational Engineering and Sciences, (S.N. Atluri, T. Nishioka and M. Kikuchi, Editors), Tech Science Press. CDROM, Chapter 7, Paper 21. 1-6 (2001)
• [Publications] Fujimoto, T., Nishioka, T.: "Numerical Analysis of Fracture under Dynamic Large Deformation Using a Moving Finite Element Method"Advances in Computational Engineering and Sciences, (S.N. Atluri, T. Nishioka and M. Kikuchi, Editors), Tech Science Press. CDROM, Chapter 7,Paper 27. 1-6 (2001)
• [Publications] Nishioka, T., Hashimoto, M, Fujimoto, T.: "Numerical Simulation of Fracture Paths in Static and Dynamic Fracture Phenomena Using a Moving Finite Element Method"Advances in Computational Engineering and Sciences, (S.N. Atluri, T. Nishioka and M. Kikuchi, Editors), Tech Science Press. CDROM, Chapter 7, Paper 22. 1-6 (2001)
• [Publications] Nishioka, T., Nishioka, R., Fujimoto, T.: "Measurement in the Vicinity of an Interface Crack Using the Intelligent Hybrid Method"Advances in Computational Engineering and Sciences, (S.N. Atluri, T. Nishioka and M. Kikuchi, Editors), Tech Science Press. CDROM, Chapter 7, Paper 5. 1-6 (2001)
• [Publications] Nishioka, T., Tchouikov, S., Fujimoto, T.: "Fracture Path Prediction Simulations of Dynamic Bifurcation Fracture Phenomena"Advances in Computational Engineering and Sciences, (S.N. Atluri, T. Nishioka and M. Kikuchi, Editors), Tech Science Press. CDROM, Chapter 7, Paper 17. 1-6 (2001)
• [Publications] Nishioka, T., Kobayashi, Y., Fujimoto, T.: "Fracture-Path Prediction Simulations in Elastic-Plastic Materials (Invited Lecture)"Plasticity, Damage and Fracture at Macro, Micro and Nano Scales, (A.S. Kahn and O.Lopez-Pamies, Editors), Neat Press. 594-596 (2002)
• [Publications] Nishioka, T., Furutsuka, J., Tchouikov, S., Fujimoto, T.: "Generation-Phase Simulation of Dynamic Crack Bifurcation Phenomenon Using Moving Finite Element Method based on Delaunay Automatic Triangulation"Computer Modeling and Engineering Simulation. Vol.3, No.1. 129-145 (2002)
• [Publications] T.Nishioka, F.Stan, T.Fujimoto: "Dynamic J Integral and Dynamic Stress Intensity Factor Distributions along Naturally and Dynamically Propagating Three-Dimensional Fracture Fronts"JSME International Journal, Special Issue on Fracture Mechanics. (2002)
• [Publications] T.Nishioka, F.Stan, T.Fujimoto: "On the Influence of the Specimen Thickness on the Dynamic Crack Propagation in Three-Dimensional Bodies"Computer Modeling and Engineering Simulation. (2002)
• [Publications] Q.H.Hu, T.Nishioka, T.Fujimoto: "GENERATlON-PHASE SIMULATION OF DYNAMIC INTERFACIAL FRACTURE UNDER IMPACT LOADING"Computer Modeling and Engineering Simulation. (2002)
• [Publications] 西岡俊久, Tchouikov Stanislav, 藤本岳洋: "動的分岐破壊の数値シミュレーションによる研究"材料」破壊力学特集号. (2002)
• [Publications] J.L.Yao, T.Nishioka, T.Fujimoto, T.Nozaki: "Crack Kinking Criterion for Bimaterial System"ASME Press Vessels and Piping Conference. (2002)
• [Publications] F.Stan, T.Nishioka, F.Fujimoto: "Application-Phase Simulation of Three-Dimensional Fracture Phenomeno"International Conference on Computational Engineering Science. (2002)
• [Publications] Q.H.Hu, T.Nishioka, T.Fujimoto: "Numerical Simulation of Interfacial Crack Propagation with Crack Face Contact"International Conference on Computational Engineering Science. (2002)