粗糙表面扭动微动磨损数值研究  

NUMERICAL STUDY ON TORSIONAL FRETTING WEAR OF ROUGH SURFACE

作　　者：刘金生 刘娟[1] 沈火明[1] LIU JinSheng;LIU Juan;SHEN HuoMing(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与工程学院,成都610031

出　　处：《机械强度》2022年第3期731-736,共6页Journal of Mechanical Strength

基　　金：国家自然科学青年基金项目(11502218)资助。

摘　　要：基于三维W-M分形函数利用SolidWorks建立三维粗糙表面,同时利用Abaqus用户子程序Umeshmotion引入能量磨损准则,建立了三维球-粗糙面接触下的扭动微动数值模型,研究初始表面粗糙度对扭动微动摩擦磨损过程的影响。首先利用G-W模型的无量纲化接触面积解析解验证了粗糙面模型的合理性,同时通过与实验的磨损结果进行对比,进而验证了数值模型对扭动微动磨损预测的精确性和有效性。分析结果表明:表面粗糙度的改变对于扭动微动磨损有着显著的影响,其中磨损体积、摩擦耗散能以及磨损率都随着表面粗糙度的增加而增加,即在同等微动条件下会加剧表面磨损;摩擦激活能随着表面粗糙度的增加而减小,越粗糙的表面磨损激活的阙值越低,故减小初始表面粗糙度可有效降低扭动微动磨损。Based on the three-dimensional W-M fractal function,a three-dimensional rough surface was bulidt by SOLIDWORKS,and then the three-dimensional ball-rough surface contact numerical model of torsional fretting with the energy wear law being introduced by the user subroutine UMESHMOTION was established by ABAQUS.Thus,the influence of initial surface roughness on the frictional wear process of torsional fretting was studied.Firstly,the reasonability of the rough surface model was verified by the analytical solution of dimensionless contact area in G-W model.Simultaneously,in comparison with experimental wear results,the accuracy and validity of the numerical model for predicting torsional fretting wear was proved.The research results show that the change of surface roughness has a significant effect on torsional fretting wear.To be specific,wear volume,friction dissipation energy,and wear rate all increase with the increase of surface roughness,which indicates that initial surface roughness can aggravate surface wear.And friction activation energy decreases with the increase of surface roughness.It is clear that the rougher the surface,the lower the threshold for wear activation.Therefore,reducing initial surface roughness can effectively alleviate the torsional fretting wear.

关 键 词：扭动微动 能量磨损法则 Umeshmotion子程序 磨损激活能 

分 类 号：TH117[机械工程—机械设计及理论]