FINITE-ELEMENT METHOD ANALYSIS OF MICRO-MACRO TRANSITION IN POLYCRYSTALLINE PLASTICITY

A macroscopic response of a polycrystalline aggregate is studied by the finite element method. The model is based on the constitutive relations which incorporate main features of microscopic mechanisms of plastic memory at the scale of grain size. The numerically evaluated plastic accommodation parameter, which relates the microscopic mechanisms on the grain scale to the global macroscopic behaviour is employed for comparison of some approximative theories of polycrystalline plasticity with detail FEM evaluation of plastic response.