Studying In Multi-scales Model Of Elastoplastic Deformation For Casting Magnesium Alloy

In recent years, there has been an increasing recognition that the macro - deformation characteristics of materials and the different scales of deformation characteristics are related closely. Studying across different scales in the quantitative relation between deformation and destruction of materials and structures has become the hotspot in the research of solid mechanics and materials science in the world at present, which has aroused people the great concern. Magnesium alloy in the cyclic load fatigue and damage as a result of materials in production processes which resulting microstructures inclusion such as: pipe, mixed, dendrite cell in crystallization course, etc. Because of the existence of inclusion, the destruction of material and the deformation of matrix magnesium are closely related with the content, size, distribution, shape and mechanical performance of the inclusion. To obtain the information of mechanics in a given load at the macro, meso, sub-micro and atomic scales, mostly lies in finding out the impact to the material and destruction resulted from micro-structure, shape, characteristics and crystal border in the each composition. Therefore, the multi-scale analysis models and methods of research should be developed. None but there are some substantiality progress in the basic research in the cross-subject of mechanics and materials, the micro-structure design of the materials, developing high-toughness materials, and the quantification of materials science will achieve new breakthroughs.In this paper, the author selected the corresponding cells according to the microstructures performance of the materials AM60 to set up the mechanics analysis models and practical effective methods which is across micro/meso/macroscopic scales so that carry out the quantitative transform of stress, strain and other mechanics parameter across different scales. On this basis, carrying on the analysis about stress and strain across micro and meso structure to study the influence in its deformation, damnification and destruction brought by non-homogeneous in the district of micro-structure and material anisotropy. We should not only achieve nonlinear constitutive relations of materials coordinated with the micro structure analysis through such cross-scale analysis, but pay most attention in the analysis and impact factors of complex microstructures such as : inclusion, hole, impurity, crack and multiphase medium, etc.