Inelastic Deformation of Polycrystal and Development of Surface Roughness

Abstract

Poly crystalline materials are composed of crystal grains, each of which is joined with neighboring grain via so-called grain boundary. The grain boundary is supposed to play a major role in the deformation behavior at high temperature. This paper deals with the three dimensional finite element analysis of such poly crystals. A single crystal model proposed by Asaro is employed in each crystal and grain boundary sliding is also taken in account. It is shown that the local deformation is relaxed due to the grain boundary sliding and that the geometrical configuration of grain boundary is dominant on the inhomogeneous deformation of the poly crystal material model.