金属材料细观尺度下各向异性非弹性有限变形与损伤

This project mainly focuses on the mechanism and process of the anisotropy inelastic finite deformation and damage of metallic materials under meso scale. The theoretical, experimental and numerical investigations on crystal slipping inelastic constitutive model, numerical algorithm, material micro-structure orientation and micro-behavior of material, etc. have been carried out. These researches have taken the strong influence of micro-anisotropy of material into account.Three different numerical analytical algorithms of crystal thermo anisotropy slipping finite inelastic deformation have been developed in order to simulate the material deformation and failure under meso scale. Among them there are two applying implicit methods that are mainly designed for quasi-static micro damage analysis, and the other one applying mixed algorithm of explicit with implicit and is designed specially for dynamic micro failure analysis. They have all been proved suitable for the analysis for single crystalline and polycrystalline micro inelastic damage and failure and also suitable for the thermo visco-plastic analysis for the component of single crystal or directional solidification alloy.In the research project, some clear mechanical images have been presented for explaining the development and competition between micro-plasticity and micro-crack, which is obtained from the research on the inelastic micro-deformation and grain inter-granular interaction of polycrystalline materials. And from the analysis it has been found that there is a evident increase of the difference of statistical stress for the polycrystalline material caused by the micro inelastic deformation in the micro anisotropy environment.Large number of experimental researches has been carried by using the materials of copper, aluminum single crystals and nickel-base directional solidification alloy. Also a practice method of parameter determination for a visco-plastic model has been suggested in this research project.Total 27 research papers written by the group members are published during the performance of this project. And there are 4 graduated students passed their dissertation defenses and gain their PhD degree, and there are 3 students gain their degree of master.During this research of the project the applicant developed the cooperation with their colleagues abroad in GKSS research center of Germany and the University of Nebraska-Lincoln of US.

研究金属材料在细观尺度下各向异性非弹性有限变形的损伤演化规律和本构关系;各向异性逯形⒔峁乖诓煌αψ刺图釉靥跫碌难莼拖嗷ジ缮?材料各向异性非弹性性质随变形过程的变化.建立适用于正交各向异性非弹性有限变形和损伤分析的数值计算方法.深化和发展对韧性金属材料在细观尺度下的非弹性有限变形,损伤与破坏规律的认识和理论.