Basic Studies on Dynamic Interfacial Fracture Mechanics

动态界面断裂力学基础研究

• 批准号: 08455063
• 负责人: NISHIOKA Toshihisa
• 金额: $ 4.35万
• 依托单位: Kobe University of Mercantile Marine
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455063/
• 关键词: Separated Dynamic J Integral; Separated Energy Release Rate; Path Independent Integral; Moving Finite Element Method; Intersonic Interfacial Fracture; Fracture Path Numerical Prediction; Application Phase Simulation; Interfacial Crack Impact Respon

In this research project, dynamic interfacial fracture phenomena were investigated by using experimental, theoretical and computational mechanics approaches in a unified fashion. Through these investigations, fundamental information and data on dynamic interfacial fracture mechanics were acquired. Furthermore, some mechanisms of -dynamic interfacial fracture phenomena were clarified. The major research results of this project are listed as follows :1. Experimental Studies :(1) Evaluations of interfacial fracture toughness and separated energy release rates,(2) Developments of the concept of equivalent residual force and the evaluation method of residual stress intensity factor,(3) Finding of the differences in crack velocities of interfacial dynamic fracture phenomena under static and impact loads,(4) Finding of the possibility of intersonic crack velocity in dynamic interfacial fracture.2. Theoretical Studies :(1) Creation of the concepts of path independent separated T* integral, pat … More h independent separated dynamic J integral, path independent separated J integral, and separated energy release rate,(2) Derivation of the relations between the separated dynamic J integrals and stress intensity factors,(3) Clarification of the mechanisms of energy flow to propagating interfacial cracks under tension-dominant type and shear-dominant type loads,(4) Clarification of the mechanism of fracture energy supplies to a propagating interfacial crack tip from both sides of bimaterial.3. Computational Mechanics Studies :(1) Developments of moving finite element methods for dynamic interfacial crack propagation,(2) Success of numerical simulations of intersonic and supersonic interfacial crack propagation,(3) Evaluation of energy release rate for intersonically and supersonically propagating cracks, using the dynamic J integral,(4) Visualization of Mach shock waves emanated from intersonically and supersonically propagating crack tips,(5) Clarification of impact responses of separated energy release rates for interfacial cracks,(6) Development of moving finite element method based on delaunay automatic mesh generation,(7) Success of numerical prediction of dynamic fracture path using mixed-phase simulation with fracture path prediction mode,(8) Developments of schemes for application phase simulation of non-straight fracture phenomena.Since the above research results include many important items such as the concept of the separated dynamic J integral, the outcomes of this research project can be expected to contribute to the establishment of dynamic interfacial fracture mechanics. Less

在本研究计划中，动态界面断裂现象的研究，采用实验，理论和计算力学的方法在一个统一的方式。通过这些研究，获得了动态界面断裂力学的基本信息和数据。进一步阐明了非动态界面断裂现象的机理.本课题的主要研究成果如下：1.实验研究：（1）界面断裂韧性和分离能量释放率的评估;（2）等效残余力概念和残余应力强度因子评估方法的发展;（3）静态和冲击载荷下界面动态断裂现象裂纹速度差异的发现;（4）动态界面断裂中跨音速裂纹速度存在的可能性.理论研究：（1）提出了路径无关的分离T* 积分、pat ...更多信息 h独立分离动态J积分、路径独立分离动态J积分和分离能量释放率，（2）推导分离动态J积分与应力强度因子之间的关系，（3）阐明拉伸主导型和剪切主导型载荷下界面裂纹扩展的能量流动机制，（4）阐明了断裂能从双材料两侧向扩展界面裂纹尖端提供的机理.计算力学研究：（1）动态界面裂纹扩展的移动有限元方法的发展;（2）成功地数值模拟了跨音速和超音速界面裂纹扩展;（3）利用动态J积分估算了跨音速和超音速扩展裂纹的能量释放率;（4）显示了从跨音速和超音速扩展裂纹尖端发出的马赫激波;（5）阐明了界面裂纹的分离能量释放率的冲击响应;（6）发展了基于Delaunay自动网格生成的移动有限元方法;（7）采用裂缝路径预测模式的混合相模拟方法成功地进行了动态裂缝路径的数值预测。（8）非核武器应用阶段模拟方案的发展直线断裂现象。由于上述研究结果包括许多重要项目，如分离动态J积分的概念，本研究成果可望对动态界面断裂力学的建立有所贡献。少

项目成果

T.Nishioka: "Computational Dynamic Fracture Mechanics" International Journal of Fracture. (1997)

T.Nishioka：“计算动态断裂力学”国际断裂杂志。

Nishioka, T.: ""Basic Studies on Impact Fracture Phenomena in Materials and Structures" (in Japanese), Proceedings of Symposium on Impact Fracture Phenomena in Materials and Structures and Their Prevention" Report of Research Committee in Materials and Me

Nishioka, T.：“材料和结构中冲击断裂现象的基础研究”（日语），材料和结构中冲击断裂现象及其预防研讨会论文集”材料与机械研究委员会报告

Nishioka,T.and Wang,Z.M.: "The T^* Integral and the Separated T^* Integrals for Elastic-Plastic Interfacial Cracks" Constitutive and Damage Modeling of Inelastic Deformation and Phase Transformation. 741-744 (1999)

Nishioka,T. 和 Wang,Z.M.：“弹塑性界面裂纹的 T^* 积分和分离 T^* 积分”非弹性变形和相变的本构和损伤建模。

Nishioka, T., Tokudome, H., Kinoshita, M.and Nishida, H.: "Dynamic Fracture Path Prediction by Moving Finite Element Method Based on Delaunay Automatic Triangulation" Modeling and Simulation Based Engineering. Vol.II. 1335-1340 (1998)

Nishioka, T.、Tokudome, H.、Kinoshita, M. 和 Nishida, H.：“基于 Delaunay 自动三角测量的移动有限元方法进行动态断裂路径预测”基于建模和仿真的工程。

Nishioka, T.and Wand, Z.M.: "The T^* Integral and the Separated T^* Integrals for Elastic-Plastic Interfacial Cracks" Constitutive and Damage Modeling of Inelastic Deformation and Phase Transformation. 741-744 (1999)

Nishioka, T. 和 Wand, Z.M.：“弹塑性界面裂纹的 T^* 积分和分离 T^* 积分”非弹性变形和相变的本构和损伤建模。