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Study on Finite Element Analysis Considering Coupling of Material Failure and Structural Collapse

考虑材料失效与结构倒塌耦合的有限元分析研究

基本信息

批准号：
15206094
负责人：
TOI Yutaka
金额：
$ 15.72万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15206094/
关键词：
Material Faillure Structural Collapse Finite Element Method Continuum Damage Mechanics Local Approach to Fracture Locally-Coupled Approach Elasto-Plasticity Fatigue

项目摘要

The finite element analysis using constitutive equations based on continuum damage mechanics has made possible nonlinear analysis considering coupling of material failure and structural collapse, although there still remain some problems. The purpose of the present study is to develop a prototype program for coupled analysis of material failure and structural collapse, based on the research results concerning local approach to fracture.The following has been done to establish the procedure of locally-coupled approach. A program for elasto-viscoplastic analysis by ASI and 3-d finite element method has been completed, based on the existing results. This program gives the displacement and strain history by the analysis neglecting damage and determines the spot to be damaged. Then, an elasto-viscoplastic damage constitutive equation and its integrator program have been developed, considering ductile, brittle, creep, fatigue and environmental damage. This integrator gives the damage history of the damaged spot, based on which the creep and fatigue life can be determined.Next, the following has been done to establish the procedure of fully-coupled approach. A program for elasto-viscoplastic damage analysis by ASI and 3-d finite element method has been completed, introducing the established elasto-viscoplastic damage constitutive equation. The material failure and structural collapse are judged, based on the calculated history of stress, strain, displacement and damage. The global system has been completed by incorporating the parallel processing solver for large-scale analysis. The developed program has been applied to the fully or locally-coupled analysis of some structures and structural members. The validity of the program has been demonstrated by comparing the calculated results with the corresponding experimental results.

基于连续损伤力学的本构方程的有限元分析使考虑材料失效和结构倒塌耦合的非线性分析成为可能，但仍然存在一些问题。本研究的目的是基于有关断裂局部方法的研究成果，开发一个用于材料失效和结构倒塌耦合分析的原型程序。以下工作是为了建立局部耦合方法的程序。基于现有结果，已经完成了采用 ASI 和 3-d 有限元方法进行弹粘塑性分析的程序。该程序通过忽略损坏的分析给出位移和应变历史，并确定损坏的位置。然后，开发了弹粘塑性损伤本构方程及其积分程序，考虑了延性、脆性、蠕变、疲劳和环境损伤。该积分器给出了损坏点的损坏历史，据此可以确定蠕变和疲劳寿命。接下来，已完成以下工作以建立全耦合方法的程序。完成了ASI和三维有限元法弹粘塑性损伤分析程序，引入了已建立的弹粘塑性损伤本构方程。根据计算的应力、应变、位移和损坏的历史来判断材料失效和结构倒塌。通过合并用于大规模分析的并行处理求解器，完成了全局系统。开发的程序已应用于一些结构和结构构件的完全或局部耦合分析。通过计算结果与相应实验结果的比较，证明了该程序的有效性。