In order to analyze the distribution of residual stresses on the surface and in the interior of aerospace alumi⁃num alloys represented by 2A12 aluminum alloy after laser shock peening,the residual stress field of 2A12 aluminum al⁃loy after laser shock peening with a square spot was analyzed by numerical simulation,and the distribution curves of the residual stress field were obtained under different laser parameters.It is found that,under the fixed parameters of pulse width of 10 ns and spot size of 4 mm,the single-spot laser shock peening has the optimal residual stress distribution at a peak pressure of 1 800 MPa,with a maximum residual stress value of-242.1 MPa,and the optimal residual stress distri⁃bution is obtained by shock peening twice,with a maximum residual stress value of-403.8 MPa.In addition,in multi-spot laser shock peening,utilizing 60％of spot overlap ratio can produce the best residual stress distribution in both sur⁃face and depth directions.The simulation results of this model are in good agreement with the experimental data,which can provide theoretical guidance for the actual square spot laser impact strengthening experiments on aluminum alloys.
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