Elastoplastic Behavior of Particle Reinforced Metal Matrix Composites Considering the Interfacial Debinding

Based on Mori-Tanaka's concept of average stress in the matrix and Eshelby's equivalent inclusions theory, the stress or strain of the matrix, the reinforced particles and the composite are derived under a prescribed traction boundary condition. The plastic strains and strains due to thermal mismatch between matrix and reinforced phase are considered as eigenstrains. Then the elastoplastic properties of the spherical particle reinforced metal matrix are discussed considering the interfacial debinding by secant modulus method. In this paper, the matrix and composite are postulated isotropic and the matrix satisfies Mises yield criterion and isotropic hardening law. The interface debinding is decided by the tensile strength of the particles and the debinding probability is described by Weibull distribution. The theoretical uniaxial stress-strain behavior of the composite agrees well with the experimental curves.