Adjustment of surface stress state of 5B05 aluminum alloy by laser shock wave

The residual stress of shock spot and its boundary points, before and after laser shock processing(LSP), was measured by X-ray diffractometer at three different directions. According to the calculation formulae of principal stress and its direction angle, the value and direction angle of the principal stress of test points before and after LSP are calculated, and then their distribution characteristics are analyzed. The results indicate that LSP can not only adjust the value of the surface principal residual stress of 5B05 aluminum alloy but can also adjust its direction as well. The test point where the maximum principal stress gained the most is not the point where the minimum principal stress gained the most. After the effect of laser shock wave, the surface stress state of 5B05 aluminum alloy was improved. The stress distribution became scattered and the stress field was enlarged.