基于FEM–DEM的空心稳定杆内壁喷丸仿真分析  

FEM-DEM Simulation on Innner Wall Shot Peening of Hollow Stabilizer Bar

作　　者：任旭东 汪舟[1,2,3] 卢伟 罗素晖 王晓丽 邓小云 刘浩均[4] 郑世祺 张旭 REN Xu-dong;WANG Zhou;LU Wei;LUO Su-hui;WANG Xiao-li;DENG Xiao-yun;LIU Hao-jun;ZHENG Shi-qi;ZHANG Xu(School of Automotive Engineering,Wuhan University of Technology,Hubei 430070,China;Hubei Key Laboratory of Modern Automotive Components,Wuhan University of Technology,Hubei 430070,China;Hubei Collaborative Innovation Center of Automobile Parts Technology,Wuhan 430070,China;Guangzhou Huade Automotive Spring Co.,Ltd.,Guangzhou 511339,China)

机构地区：[1]武汉理工大学汽车工程学院,武汉430070 [2]武汉理工大学现代汽车零部件湖北省重点实验室,武汉430070 [3]汽车零部件技术湖北省协同创新中心,武汉430070 [4]广州华德汽车弹簧有限公司,广州511339

出　　处：《表面技术》2023年第1期410-420,共11页Surface Technology

基　　金：校企合作项目(20211h0038)。

摘　　要：目的建立有限元–离散元耦合的喷丸模型,研究喷丸参数对空心稳定杆内壁残余应力场的影响规律。方法基于ABAQUS有限元分析软件和“先整体后局部”的建模方法,建立26MnB5钢空心稳定杆全段和局部FEM–DEM喷丸模型,并对模型进行残余应力验证。通过局部喷丸模型研究弹丸撞击角度、速度、表面覆盖率和喷丸流量对稳定杆第4弯折处内壁残余应力场分布的影响规律。结果残余应力场分布的实验值与仿真值的误差在7%以内,验证了模型的准确性。随着弹丸撞击角度的增大,最大残余应力和残余压应力层深也会随之增大,并在60°后达到饱和;当弹丸速度为80m/s和100m/s且弹丸数量为1∶1时,表面残余应力和最大残余应力分别约为-926 MPa和-1309 MPa;随着弹丸覆盖率的增大,表面残余应力和最大残余应力均增大,但增幅变缓,在覆盖率为200%后基本达到饱和;随着喷丸流量的增大,表面残余应力和最大残余应力先增大后减小,在1.2kg/min时达到最大值,分别约为-649MPa和-1049MPa。结论基于FEM–DEM的空心稳定杆内壁喷丸模型能够很好地预测残余应力场的分布,该研究为空心稳定杆内壁喷丸工艺的数值模拟提供了研究思路和理论支持。The transverse stabilizer bar is the key safety part in the suspension system of automobile.As a typical component affected by fatigue force,its performance is very important for driver’s comfort,safety and handling stability in driving.Therefore,improving the fatigue performance of the stabilizer bar is very important to extend and reduce the service time and failure risk of the stabilizer bar.As a mechanical surface strengthening method widely used in industrial production,shot peening has become an essential process in the production process of stabilizer bar because of its obvious effect on fatigue life improvement.The work aims to establish a shot peening model for coupling finite element and discrete element to study the effect law of shot peening parameters on the residual stress field on inner wall of hollow stabilizer bar.Therefore,26MnB5 hollow stabilizer bar was taken as the research object.Firstly,the fatigue life of the hollow stabilizer bar was tested.The results showed that the fourth bend was the part of the stabilizer bar prone to fatigue fracture.The crack initiation point at the fracture was located in the inner wall of the fourth bend of the stabilizer bar.Therefore,in order to improve the fatigue life of the stabilizer bar,the inner wall of the stabilizer bar should be strengthened by shot peening,especially the surface modification of the inner wall at the fourth bend of the stabilizer bar.Stabilizer bar was built based on FEM-DEM coupling approach shot peening model,with the"first whole,after local"simulation method,first through the stabilizer bar segment model shot velocity distribution in the fourth bend,then through the fourth bend specific region of the stabilizer bar model to study the effect of shot peening parameters on the residual stress distribution.The residual stress distribution of the SP model was verified.The results showed that the errors between the experimental and the simulated value of residual stress field distribution was less than 7%,which verified the accuracy of

关 键 词：空心稳定杆喷丸 FEM–DEM耦合仿真 模型简化 喷丸参数 残余应力分布 

分 类 号：TG668[金属学及工艺—金属切削加工及机床]