微粒子喷丸影响因素的数值仿真

Numerical simulation on influencing factors of micropartical shot peening

微粒子喷丸得到的残余压应力场和表面粗糙度除了受微粒子直径和冲击速度的影响,还受到冲击次数,冲击角度和搭接率的影响,为了研究这些工艺参数对微粒子喷丸强化效果的影响规律,采用ANSYS/LS-DYNA对微粒子喷丸的有限元模型进行了数值仿真分析。结果表明,随着冲击次数的增加和冲击角度的增大,残余压应力场的大小和深度逐渐增大,表面粗糙度也逐渐增大。残余压应力场的大小和深度以及表面粗糙度都与搭接率呈下凹的二次曲线关系。

The residual compressive stress field and surface roughness obtained by microparticle shot peening are affected not only by the microparticle diameter and the impact velocity,but also by the number of impact,the impact angle and the overlapping ratio. In order to study the influence of these process parameters on the effect of microparticle shot peening,the finite element model of microparticle shot peening was simulated by means of ANSYS/LS-DYNA. The results show that increasing the impact times and angle will increase the size and depth of the residual compressive stress field,as well as the surface roughness. The size and depth of the residual compressive stress field and the surface roughness are in a concave quadratic curve relationship with the overlap ratio.