利用高功率Nd:YAG激光对不同工艺处理的弹性元件进行单点冲击处理, 用X射线应力分析仪测量弹性元件内侧的残余应力并计算出残余主应力及方向角, 分析了弹性元件表面残余应力与表面主应力的关系, 研究了激光冲击对弹性元件疲劳源的影响。结果表明, 弹性元件在经激光冲击处理的表面强化区产生残余压应力, 残余主应力与残余应力之间存在定量关系, 表面残余最大主应力方向向可控裂纹扩展方向改变, 有效控制0°方向的残余应力大小, 可以防止裂纹的扩展。

The elastic elements manufactured by different treatment processes were treated by laser shock processing (LSP) with high power Nd:YAG laser. Residual stresses on inner surface were measured by X-ray diffraction (XRD) and principal stresses were calculated. The relationship between residual stress and residual principal stress was analyzed, and the influence of LSP on the elastic element fatigue source was discussed. The results indicate that residual compressive stresses on surface of springs were obtained. The quantitative relation exists between principal stress and residual stress. To prevent the crack expansion, the direction of residual maximum principal stress was changed and the residual stress at 0° was controlled.