具有粗糙分形表面的金刚石压头与铜基体接触摩擦特性  

Contact and friction characteristics of diamond indenter with rough fractal surface and copper substrate

作　　者：孙韵韵 张妍 巫世晶[1] 刘胜[1] SUN Yunyun;ZHANG Yan;WU Shijing;LIU Sheng(College of Power and Mechanical Engineering,Wuhan University,Wuhan 400072,China)

机构地区：[1]武汉大学动力与机械学院,武汉430072

出　　处：《振动与冲击》2024年第19期94-102,173,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(52105270);机械结构力学及控制国家重点实验室开放课题(MCMS-E-0422G01);武汉市知识创新专项曙光计划项目(2023010201020239);中央高校基本科研业务费(2042023gf0001)。

摘　　要：考虑金刚石压头表面的粗糙形貌,结合旋转矩阵法和分形几何理论,构建具有径向粗糙分形特征的压头表面,利用分子动力学方法模拟金刚石压头与铜基体的纳尺度接触摩擦过程,揭示压头表面粗糙形貌、压入深度和滑动速度对压头-铜基体接触界面摩擦力、磨损量等特性的影响。研究表明:压头粗糙形貌直接影响滑动摩擦力和基体磨损量,当压入深度和滑动速度恒定时,压头表面越粗糙,界面摩擦力和基体磨损量都越大;当压头的表面形貌恒定时,增大压头的压入深度或滑动速度,界面对应的摩擦力、基体温差均随之增加;对于压头粗糙形貌、压入深度和滑动速度三种因素,滑动摩擦力和基体磨损量对压头表面粗糙形貌和压入深度更敏感,而铜基体温差对滑动速度更敏感。Here,considering rough morphology of diamond indenter surface,combining the rotating matrix method with the fractal geometry theory,the indenter surface with radial roughness fractal characteristics was constructed.Molecular dynamics method was used to simulate nanoscale contact friction process between diamond indenter and copper matrix,and reveal effects of indenter surface rough morphology,indentation depth and sliding speed on contact interface friction force,wear amount and other characteristics of indenter-copper matrix.The study showed that rough morphology of indenter directly affects sliding friction and substrate wear,when indentation depth and sliding speed are constant,the rougher the indenter surface,the larger the interface friction and substrate wear;when surface morphology of indenter remains constant,with increase in indentation depth or sliding speed,the corresponding interface frictional force and substrate temperature difference increase;for 3 factors of indenter surface rough morphology,indentation depth and sliding speed,sliding friction force and substrate wear are more sensitive to indenter surface rough morphology and indentation depth,while temperature difference of copper substrate is more sensitive to sliding speed.

关 键 词：粗糙压头 径向分形特征 摩擦特性 分子动力学 

分 类 号：TH117.1[机械工程—机械设计及理论]