中文摘要：

采用数值仿真的方法,研究了激光冲击强化对175A型柴油机曲轴疲劳寿命的影响,取得了数值仿真条件下曲轴过渡圆角处残余应力场的数据,数值仿真结果和实验结果的对比分析表明：数值仿真结果和实验结果较为接近,从而验证所采用的材料本构模型、冲击波峰值压力和冲击波作用时间是精确的。通过此类激光冲击强化仿真分析,可优化激光冲击的相关参数,使曲轴过渡圆角产生有利的残余应力场,从而为激光冲击强化曲轴提供优化的工艺参数。

英文摘要：

Laser shock peening is a technique similar to shot peening. Laser shock peening imparts compressive residual stresses in materials to improve the fatigue resistance. During a laser shock peening event, pressure well above the dynamic yield strength of the material is imparted on the target within a microsecond. The severity of the loading causes local plastic deformation, which ultimately results in the development of the favorable residual stresses. Finite element analysis technique was applied to predict the residual stress induced from laser shock peening. The comparison between the simulation and experimental results was carried out and the model was validated subsequently. The results showed that the numerical simulation on laser shock peening was effective for the crankshaft design and parameters optimization.