基于静力等效的喷丸工艺数值模拟

The numerical simulation of shot peening process with an equivalent static loading method

根据喷丸过程的特点,用静力等效的方法对喷丸强化工艺进行数值模拟,避免了动态显式算法中计算结果的不稳定。分析弹丸与工件之间的平均接触应力的变化规律,对喷丸过程中的不同阶段进行划分,推导了等效载荷的表达式。考虑到弹坑分布对于残余应力的影响,开发了弹坑阵列模型,结果表明,弹坑阵列模型预测的残余应力分布与实际情况相符。

According to the character of shot peening process,an equivalent static loading method was employed to simulate the shot peening process,which can avoid the unstable factor in the dynamic explicit algorithm.The regularity of the average contact stress between shot and target was analyzed,based on which the shot peening process was divided into several different stages,then the equation of the equivalent static load was obtained.To evaluate the relationship between the indentations＇ distribution and compressive residual stress,an indentation array model was developed,and the simulation results show good agreement with the existed experiment data.