摘要：The strengthening effect and uniformity of residual stress and strain of 7075-T6 aviation aluminum after laser shockpeening were investigated. The finite element simulation model of laser shot peening on 7075-T6 aviation aluminum alloywas established and verified. On this basis and combined with experiment, the microstructure, residual stress distribu-tion and equivalent strain distribution of 7075-T6 aviation aluminum alloy after laser shock peening were studied. Anindex U for evaluating the strain uniformity in the peened area was proposed based on the statistical processing of theequivalent strain distribution in the peened area. The results show that the average grain size on the peened surface ofthe specimen was refined to 20–30mm after LSP, and a residual compressive stress layer with thickness of about 0.5mmwas induced on the surface. Grain refinement and residual compressive stress can promote the strength and fatigueproperties of 7075-T6 aviation aluminum alloy. The minimum value of U is obtained in the 6 3 6 spot array (the corre-sponding overlap ratio is 58%), which suggest that the most uniform deformation peened area can be obtained by using58% overlap ratio in the laser shot peening process, which can avoid stress concentration and improve fatigue life.
