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Development of Nonlinear Numerical Fracture Mechanics Based on Energy Release Rate

基于能量释放率的非线性数值断裂力学的发展

基本信息

批准号：
09651021
负责人：
MURAKAWA Hidekazu
金额：
$ 1.98万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

In the present research, the energy release rate is selected as a basic concept to understand the crack propagation problem since it has clear physical meaning. To compute the G-value, full advantage of nonlinear FEM, which considers finite strain plasticity, is taken. Also, FEM introducing an interface element is developed specially for the crack propagation analysis. The proposed method is applied to various problems listed below and its potential usefulness is demonstrated.The interface element models the formation of new surfaces during the crack propagation. Such interface elements are arranged along the crack propagation path so that the analysis of the crack propagating with dissipating the energy equal to the surface energy.(1) Developed programsProgram to compute G-value for axisymmetric elastic large deformation problem.Program to compute G-value for 3-dimensional finite-strain-elastic-plastic problemPrograms for static and dynamic crack propagation using interface element (2-dimensional and 3-dimensional finite-strain-elastic-plastic problems)Programs for static and dynamic crack propagation using interface elementProgram for hot cracking using temperature dependent interface element(2) Investigated problemsDebonding of thin film on substrate accompanying buckling.Effect of Strain Hardening Properties of Material on ToughnessAnalysis of Delamination between bonded platesSteady Ductile Crack Propagation in Center Notched Steel PlateInfluence of inertia force on Charpy Impact TestInfluence of Applied Stress on Speed of Dynamically Propagating Crack in Elastic PlateInfluence of Specimen Geometry and Welding Conditions of Hot Cracking in Weld

在本研究中，能量释放率被选为理解裂纹扩展问题的基本概念，因为它具有明确的物理意义。在计算G值时，充分利用了考虑有限应变塑性的非线性有限元法。引入界面单元的有限元法是专门为裂纹扩展分析而开发的。所提出的方法被应用到各种问题列出如下，其潜在的有用性被证明。界面单元模拟裂纹扩展过程中的新表面的形成。这种界面单元沿着裂纹扩展路径布置，使得裂纹扩展的分析中耗散的能量等于表面能。(1)编制了轴对称弹性大变形问题G值计算程序、三维有限应变弹塑性问题G值计算程序、用界面元计算静态和动态裂纹扩展程序（二维和三维有限应变弹塑性问题）用界面元计算静态和动态裂纹扩展的程序用与温度有关的界面元计算热裂纹的程序（2）研究问题基体上薄膜的脱粘伴随屈曲材料的应变硬化特性对韧性的影响粘结板间分层分析中心切口钢板中的稳态延性裂纹扩展惯性力对夏比冲击试验的影响外加应力对弹性板中动态扩展裂纹速度的影响试样几何形状和焊接条件对焊缝热裂纹的影响