Formation and self-organization of the LPD bands within the range from meso- to macrolevel in polycrystals under tensile loading

In the paper, a mesomechanical model of development of localized plastic deformation in a plane polycrystal is described on the basis of the relaxation element method. The model operates in accordance with the algorithm of cellular automata. The model describes self-organization of band structures in polycrystals and accounts for the following physical factors: work hardening, the number of sliding systems in the crystal and the influence of free surfaces in the case of a polycrystal. The results show, that the physical principles, laid down in the model, allow one to predict experimentally observed regularities in the development of localized plastic deformation on mesolevel. (C) 1999 Elsevier Science B.V. All rights reserved.