Preliminary examination of the modified lower-bound meso-damage constitutive model for porous materials

Abstract

The paper aims at the examination of the modified lower bound rigid plastic constitutive model for porous materials by comparing it with other ones. Under uniaxial stress state, the porous copper's compressibility, ductility, strength property, deformation characteristics, stress/spl sim/strain curves and damage evolution process predicted by these models are systematically contrasted with each other. The effectiveness of the scheme for modifying the lower bound model by introducing void interaction mechanism into its theoretical framework is verified.