物理学报2009，Vol.58Issue(z1)：79-83,5.
基于孔洞体胞模型铸造镁合金ML308的本构方程
Constitutive equation of casting magnesium alloy ML308 based on void-cell model
摘要
Abstract
Casting magnesium alloys are heterogeneous materials containing numerous voids. These voids markedly affect the mechanical behaviour of the materials. In this paper, a void-growth equation is obtained based on the analysis of a spherical void-cell model, and a void-nucleation equation is presented which is related to the increment of intrinsic-time measure. The evolution equation of the voids is obtained by combining the growth equation with the nucleation equation. The obtained void-evolution equation is incorporated into a nonclassical elastoplastic constitutive equation through introducing a softening function, thus obtaining a constitutive equation that involves a void evolution. A corresponding finite element procedure is developed and applied to the description of the rule of the void evolution and the mechanical behaviour of casting magnesium alloy ML308. Computed results are shown to be in satisfactory agreement with experimental data.关键词
铸造镁合金/孔洞体胞模型/孔洞演化方程/本构方程Key words
casting magnesium alloy/void-cell model/void evolution equation/constitutive equation分类
数理科学引用本文复制引用
陈斌,彭向和,孙士涛,权国政,罗吉..基于孔洞体胞模型铸造镁合金ML308的本构方程[J].物理学报,2009,58(z1):79-83,5.基金项目
国家自然科学基金(批准号:10872221,50621403)资助的课题. Project supported by the National Natural Science Foundation of China (Grant Nos. 10872221, 50621403). （批准号:10872221,50621403）
