Finite Element Analysis of Residual Stress Induced by Multiple Laser Shock Peening with Square Spots
R. Zhu, Y.K. Zhang, G.F. Sun, S.B. Zhang, P. Li and Z.H. Ni
Laser shock peening (LSP) is a competitive innovative surface treatment technique, which can induce compressive residual stresses in metal materials. In this investigation, a modified explicit finite element analysis (FEA) method was used to predict the residual stress distribution in 2050- T8 aluminum alloy induced by LSP. The laser shock sequence was programmed by VDLOAD ABAQUS subroutine. Simulated residual stresses from FEA showed good consistency with open literatures. Based on the method, the effects of LSP parameters such as overlapping percentage, number of impacts, laser power density, laser spot size on the average surface residual stress and average in-depth residual stress of 2050-T8 aluminum alloy were analyzed.
Keywords: Laser shock peening, residual stress, modified explicit simulation