A SELF-CONSISTENT MODEL OF ISOTROPIC VISCOPLASTIC BEHAVIOR IN MULTIPHASE MATERIALS

We propose a simple, straightforward self-consistent method for predicting the inelastic stress-strain behavior of multiphase materials. Each constituent phase is modeled as an isotropic, incompressible viscoplastic solid. A self-consistent scheme is used to derive the properties of the composite. A small, nonlinear set of equations emerges which is solved using standard numerical techniques. The method is applied to a two-phase material with fixed phase fractions. Model predictions are compared with experimental data and results of other models.