Abstract
Laser shock processing (LSP) has been now recognized as an efficient surface strengthening technology to improve fatigue, corrosion and wear resistance of metals. In this paper, the effect of residual stress on the fatigue life of 2A02 aluminum alloy specimens subjected to LSP was investigated by the finite element method (FEM). This investigation was split into two parts, numerical simulation of the LSP process and the fatigue analysis. The LSP simulation was performed using the commercial code ABAQUS. The fatigue analysis, using the residual stresses obtained in the previous LSP simulation as input, was performed by the commercial node nCode Designlife. The simulation results indicate that under the fatigue loading of maximum axial stress of 365MPa and the stress ratio of R=0.1, the fatigue life of specimens with LSP was extended up to 205.7% from 12,290 times to 25,280 times. It was observed that the residual compressive stresses induced by LSP can significantly prolong the fatigue life of 2A02 aluminium alloy specimens. It is found that simulation results are well agreement with available experimental data. It indicate that FEM calculation of specimen life with LSP is feasible.
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