Effects of micro-structures of materials on the characteristics of initial yielding and phenomenological constitutive laws

Abstract

Incremental elasto-plastic average behaviors of composites with many different inhomogeneities are simulated on the basis of the Mori-Tanaka theory. An emphasis is put on the initial yielding and flow rule of such composites, and the average behaviors are compared with the classical plasticity models. It is shown that an approximate model of yielding of compositeswhich have random slip systems can be described by the von Mises yield condition and theordinary associated flow rule.