ON ANISOTROPIC FINITE DEFORMATION PLASTICITY .2. A 2-COMPONENT MODEL

The anisotropic plastic behavior of materials during finite deformatio n is partly due to the development of different types of textures or s ubstructures. In order to describe phenomenologically this behavior, a two-component model of finite plasticity is proposed based on the sca le invariance approach earlier advanced by Aifantis and co-workers. Ea ch component follows its own evolution and rotation rules to account f or the different textures occurring during the deformation process. A direct extension of this framework to consider viscoplastic effects is also developed. The model is applied to simulate the anisotropic defo rmation behavior of materials under tension, compression and torsion. The results arc compared with available experimental data and related predictions of polycrystalline plasticity models. It is shown that the present continuum model has the advantages of both accuracy and simpl icity as compared to polycrystalline calculations.