Residual Stress Relaxation in Shot Peened Surface Layer on TiB₂/Al Composite under Applied Loading

Abstract

The residual stress relaxations in the shot peened surface layer on the TiB₂/6351Al composite under static and cyclic loading were investigated. The results show that the compressive residual stresses were relaxed under applied tensile stresses. The relaxation of the residual stresses in the longitudinal direction is more important than the one in the transverse direction. Under cyclic loading, the fast relaxation of residual stresses occurred in the first few circles. The main reason of the residual stresses relaxations is the inhomogeneous local plastic deformation caused by the large number of the reinforcement particles in the matrix during applied loadings.