预加载荷对表面机械滚压强化残余应力影响的数值研究  

Numerical study of effects of preload on the residual stresses induced by surface mechanical rolling treatment

作　　者：胡兴远 王成 李开发 王宇星 HU Xing-yuan;WANG Cheng;LI Kai-fa;WANG Yu-xing(School of Mechanical Engineering,Anhui University of Science and Technology,Huainan 232001,China;School of Mechanical Engineering and Information,Shanghai Urban Construction Vocational College,Shanghai 201415,China)

机构地区：[1]安徽理工大学机械工程学院,安徽淮南232001 [2]上海城建职业学院机电工程与信息学院,上海201415

出　　处：《机电工程》2021年第8期1064-1069,共6页Journal of Mechanical & Electrical Engineering

基　　金：安徽省自然科学基金资助项目(2008085QE228);安徽理工大学研究生创新创业基金资助项目(2021CX2061,2020CX2048)。

摘　　要：为了研究预加载荷对表面机械滚压强化残余应力的影响,建立了表面机械滚压强化AISI 4340钢的三维有限元模型,并提出了一种耦合显式动力学-隐式静力学的计算框架,多步骤模拟了预加载荷作用下的表面机械滚压强化过程。首先,通过施加位移载荷在待滚压模型上,使之产生弹性变形;然后,固定了边界条件,冻结了弹性变形,在此基础上模拟了表面机械滚压强化过程;最后,释放了弹性变形,比较了表面机械滚压强化残余应力的变化。研究结果表明:预加载荷会导致表面机械滚压强化后的板材表层产生不利的残余拉应力,另外与滚压力方向相反的预加载荷会减小滚压强化的最大残余压应力,滚压后释放预加载荷会进一步削弱板材亚表层的残余压应力;因此,在表面机械滚压强化过程中应当避免工件承受预加载荷。In order to study the effects of preload on the residual stresses induced by surface mechanical rolling treatment(SMRT),the three-dimensional finite element models in conjunction with a novel computation framework coupling the explicit dynamics and implicit statics were developed to simulate the process of surface mechanical rolling of AISI 4340 steel under preload.At first,the elastic deformation was produced in the finite element model to be surface mechanical rolled by applying the displacement load.Secondly,the displacement-preloaded side was completely constrained for freezing the displacement-induced elastic deformation.On this basis,the surface mechanical rolling of the finite element model with the freezing elastic deformation was then carried out.Lastly,the residual stresses induced by surface mechanical rolling treatment were comparatively studied after the freezing elastic deformation was released.The obtained results show that the surface mechanical rolled materials can produce the unfavorable tensile residual stresses in the treated surface,and the maximum compressive residual stresses can be reduced if the preloading direction is opposite to the direction of rolling pressure.The compressive residual stresses in the subsurface of surface mechanical rolled materials can be further reduced when the preload is released.It is therefore necessary to avoid the preload in the surface mechanical rolling process.

关 键 词：表面机械滚压处理 预加载荷 残余应力 数值模拟 

分 类 号：TH16[机械工程—机械制造及自动化] TG668[金属学及工艺—金属切削加工及机床]