激光冲击波对5B05铝合金表面应力状态的调整

采用X射线衍射仪分别对光斑中心及其边界点冲击前后3个方向上的残余应力进行测量。根据主应力及其方向角的计算公式，计算出了各测试点冲击前后的主应力值和主应力方向角，分析了其分布特性。结果表明，激光冲击波不仅能调整5B05铝合金表面残余主应力值，还能调整其方向。最大主应力增幅最大点与最小主应力增幅最大点并不在同一点上。5B05铝合金经激光冲击波作用后，表面应力状态得到了改善，应力分布变得分散，应力域变大。

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.