A two-level (macro- and meso-) constitutive model is presented to describe processes of finite inelastic deformation of polycrystalline materials accompanied by the evolution of the internal structure. The deformation processes at the macro level are modeled using the constitutive relations based on the introduction of internal variables defined by the model of meso-level. When analyzing the evolution of internal variables, a wide range of inelastic deformation mechanisms is considered: crystal plasticity and grain-boundary sliding, temperature effects, twinning, rotation of the crystalline lattices, fragmentation and shattering of grains. Modeling results, including the characteristics of the evolving structure, agree with experimental data.
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