纵-扭复合振动超声深滚加工残余应力场数值分析

摘要

为研究平面试件在纵-扭复合振动超声深滚加工后材料应力分布及变化规律,采用有限元方法对Q345钢进行了纵-扭复合振动超声深滚加工残余应力场数值模拟.首先分析了加工后试件材料各应力分量沿深度方向的分布情况,然后研究了静压力、滚压速度、振幅和相位差对加工后材料残余应力的影响规律.结果表明:经纵-扭复合振动超声深滚加工后材料表层残余应力分布较均匀,表面为压应力,压应力沿试件深度方向先增后减;试件最大残余压应力及最大横向残余压应力深度和残余压应力层深度随静压力的增大而增大,随滚压速度的增大而减小,而表面残余压应力和最大纵向残余压应力深度无显著变化;试件横向残余压应力层深度随振幅的增加小幅度地增大,但最大残余压应力幅值和深度和纵向残余压应力层深度几无变化;相位差对残余应力影响可忽略不计.%To explore the stress distribution and laws induced by ultrasonic deep rolling with longitudinal-torsional (UDRP-LTV) vibration,the finite element method was adopted to study the residual stress in Q345 steel.The distribution of the component stress along the depth direction was studied,and the effects of the static pressure,rolling speed,longitudinal and torsional vibration amplitude on the residual stress were analyzed.The results show that the distribution of the residual stress in the surface layer is homogeneous after UDRP-LTV treatment,and the surface stress is compressive.The compressive stress firstly increases and then decreases along the depth.The maximum residual stress and the depth of the residual stress layer increase with the increasing of static force,and decrease with the increasing of rolling speed,while the surface residual stress and the depth of the maximum longitudinal residual stress slightly change.The depth of the transverse residual stress slightly increases with the increasing of amplitude,but the amplitude and depth of the maximum surface residual stress and the depth of the longitudinal residual stress slightly change.And the effect of the phase on the residual stress may be ignored.