Investigation of residual stresses distribution in equal channel angular rolled aluminum alloy by means of the slitting method

Abstract

Equal channel angular rolling is a severe plastic deformation process which produces an ultrafine-grained structure and improves the mechanical properties of the samples. In this article, using the slitting method experimentally and finite element simulation, the residual stress distribution in an equal channel angular rolled Al alloy 5083 specimen was investigated. First, by applying the slitting technique on the considered specimen, the produced strains were measured and recorded. Then by employing the series expansion method, the through-thickness residual stresses were calculated. The compliance matrix was obtained by means of finite element analysis and 16 terms of the Legendre polynomial (L2 through L17) were used to get the compliance coefficients. According to the finite element results, the residual stresses were created in the sample because of different plastic strain deformation at the same times in different locations. The residual stress distribution was non-uniform and similar to sine curve. There was a good agreement between the obtained results by slitting method and finite element simulation.