Constitutive description for casting magnesium alloy involving void evolution

来源期刊：中国有色金属学报(英文版)2010年增刊第2期

论文作者：陈斌 袁权 罗吉 范镜泓

文章页码：467 - 470

Key words：casting magnesium alloy; spherical void; void volume fraction; elastoplasticity; constitutive model

Abstract: In order to investigate the effect of microvoids on the mechanical behavior of casting magnesium alloy, a spherical void-cell model of the material was presented. The velocity and strain fields of the model were obtained from the assumption that the material matrix is homogeneous and incompressible. The hardening and softening functions, which respectively reflect the deformation-hardening and void-softening behaviors of the material, were presented and introduced to an endochronic constitutive equation for describing the mechanical behavior of the material including microvoids. The corresponding numerical algorithm and finite element procedure were developed and applied to the analyses of the elastoplastic response and the porosity of casting magnesium alloy ZL102. The computed results show satisfactory agreement with experimental data.

基金信息：the National Natural Science Foundation of China