The problem of laser impact strengthening of 7075 aluminum alloy is investigated using fi-nite element techniques and experimental methods.Firstly,the microstructure and mechanical properties of the upper surface and cross-section of the sample before and after laser shock are analyzed using opti-cal microscopy,electron backscatter diffraction,and microhardness testing.Secondly,finite element soft-ware is used to numerically simulate 7075 aluminum alloy,obtaining stress variation cloud maps and re-sidual stress cloud maps.The experimental results show that laser shock refines the surface and cross-sectional grain structure,and the proportion of recrystallized grains on the surface and cross-section in-creases respectively from 6.5％and 8.3％before laser shock to 33.0％and 80.1％,and the average mi-crohardness increases on the surface after laser shock is over 15％.As the depth increases,the increase in microhardness on the cross-section decreases gradually.The numerical simulation results show that the stress increases from 447 MPa to 581 MPa during the laser shock process,and reduces to 550 MPa when stable.Laser shock increases the residual compressive stress on the surface,while the compressive stress on the cross-section decreases with increasing thickness.
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