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

动态裂缝扩展路径应用相数值预测方法基础研究

• 批准号: 12450051
• 负责人: NISHIOKA Toshihisa
• 金额: $ 9.66万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450051/
• 关键词: Dynamic Fracture; Impact Fracture; Dynamic Fracture Path Prediction; Dynamic Crack Propagation and Arrest; Dynamic Crack Branching Prediction; Path Independent Dynamic J Integral; Switching Method; Automatic Movinf Finite Element Method; 動的J積分; 動

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 … More 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 tips2. 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 problems3. 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 frontSince 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 Less

本研究项目主要开展了以下几项基础研究：（1）动态裂缝路径预测应用阶段模拟方法的开发；（2）动态分支裂缝路径预测方法的开发。这些研究是通过统一的方式使用实验、理论和计算力学方法进行的。通过这些调查，获得了动态断裂现象的基本信息和数据。此外，还阐明了动态断裂现象的一些机制。本课题的主要研究成果如下： 1．实验研究：（1）动态分支断裂控制条件的阐明（2）跨声速界面断裂焦散理论的发展（3）自动检测和消除实验测量误差的多种智能混合测量方法的发展（4）全场测量图像相关法的最小相关系数搜索方法的发展（5）阐明 动态裂纹尖端能量通量与断裂表面粗糙度之间的相关性分析(6)跨声速传播裂纹尖端的应力奇异场因子和奇异阶数的测量2。理论研究(1)动态界面断裂统一渐近解的推导(2)动态分支裂纹路径无关动态J积分切换方法的发展(3)压电材料动态J积分的推导(4)压电材料渐近裂纹尖端近场解的推导(5)力学提取的分量分离方法发展 混合模式应力强度因子和电位移强度因子。(6)克拉克生长问题变分原理的推导3．计算力学研究：（1）基于Delaunay自动网格生成的各种移动有限元方法的发展（2）动态分支断裂数值路径预测模拟的成功（3）恒定裂纹加速度下动态断裂现象的应用阶段模拟的成功（4）自然和动态扩展裂纹前沿的动态J积分和应力强度因子的评估（5）非线性发展 动态断裂模拟方法(6) 裂纹面接触跨音速界面断裂模拟方法的发展(7) 三维动态断裂前沿形成机制的阐明 由于上述研究成果包含许多重要内容，因此本研究项目的成果有望为动态断裂力学的进步做出贡献。 对于目前和相关的成果，已获得以下奖励。(1) JSME 材料与力学成就奖,(2) JSME 最佳论文奖,(3) JSME 计算力学成就奖,(4) JSMS Impact Division 成就奖,(5) SEM Hetenyi 奖 Less

项目成果

T.Nishioka, H.Nishida, J.Furutsuka, T.Fujimoto: "Numerical Simulation of Dynamic Crack Bifurcation Phenomenon Using Moving Finite Element Method"Advances on Computational Engineering and Sciences,(S.N.Atluri, F.W.Brust, editors). Volume I. 1043-1046 (2000

T.Nishioka、H.Nishida、J.Furutsuka、T.Fujimoto：“使用移动有限元法对动态裂纹分岔现象进行数值模拟”计算工程与科学进展，（S.N.Atluri、F.W.Brust，编辑）。

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)

Toshihisa Nishioka、Takehiro Fujimoto、Naoki Kobayashi、Kosuke Kurio：“自动检测和消除实验测量误差（弹塑性变形场）的智能混合方法的实证研究”日本机械工程师学会汇刊（ed.A）。第 655 卷。424-431 (2001)

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.Chand

T.Nishioka、S.P.Shen、A.Yasin、T.Fujimoto：“冲击下动态界面断裂现象的实验、数学和计算研究”，（特邀论文）“材料加工技术杂志，特刊 THERMEC 2000（编辑：

Nishoka, T.: "Recent Theoretical and Computational Studies on Dynamic Fracture Phenomena,(Keynote Lecture)"Advances in Computational Engineering and Sciences,(S.N.Atluri, T.Nishioka, M.Kikuchi, Editors),Tech Science Press. (CDROM) Chapter 7, Paper 27. 1-6

Nishoka, T.：“动态断裂现象的最新理论和计算研究，（主题演讲）”计算工程和科学的进展，（S.N.Atluri、T.Nishioka、M.Kikuchi，编辑），技术科学出版社。

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, M.Kikuchi, Editors),Tech Science Press. (CDROM) Ch

Fujimoto, T., Nishioka, T.：“使用移动有限元法对动态大变形下的断裂进行数值分析”计算工程和科学进展，（S.N.Atluri、T.Nishioka、M.Kikuchi，编辑），Tech Science