Effect of Shot Peening Intensity on Residual Stress Field of 7075 Auminium Alloy

摘要

The glass bead and 7075 aluminium alloy was selected as the shot and target material, and the basic types of surface shape consisted in the grinded region of the corroded civil aircraft component after repairing were classified. The distribution of residual stress field along the depth of the grinded specimen with different types of surface shape was carried out based on numerical simulation. It shows that the strongest residual stress field occurs in the specimen with the concave surface, and the weakest residual stress occurs in the specimen with the biconvex surface. The concave surface, in which stress concentration occurs easily, was selected to further research the distribution of residual stress field along the depth of the grinded specimen under the different shot peening intensity or constant intensity combined with different shot peening parameters. The results show that different residual stress fields exist under a constant intensity combined with different diameter and impact velocity of shots. The distribution and variation of residual stress along the surface of component with different types of surface shape was analyzed and verified by the experimental results. The results indicate that the finite element model established was reliable and accurate.