同质材料多凸体摩擦磨损行为的分子动力学模拟  

Molecular Dynamics Simulation of Friction and Wear Behavior of Multi-convwx Homogeneous Materials

作　　者：郜家伟 姚廷强[1] 谢家琛 李廷涛 霍冀鲁 GAO Jiawei;YAO Tingqiang;XIE Jiachen;LI Tingtao;HUO Jilu(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500

出　　处：《材料科学与工程学报》2024年第1期69-75,共7页Journal of Materials Science and Engineering

基　　金：国家自然基金资助项目(12162016)。

摘　　要：从纳米级微凸体间剪切运动的角度研究干摩擦机理。考虑同质弹性材料接触过程中存在黏附力、原子转移和凸体间相互作用对纳观黏附摩擦接触过程的影响,采用分子动力学方法研究纳米尺度下同质单晶铜材料的弹性刮头与弹性多凸体基体接触过程的表面摩擦响应,分析了弹性刮头与多凸体多点连续接触的摩擦规律以及刮头接触变形与基体变形的相互作用。研究结果表明:晶格方向差异会导致凸体间不同程度的磨损,摩擦系数随着晶格角度的增大而减小;在控温条件下,摩擦系数随着晶格角度的增加而降低;速度的增加具有一定的减摩作用。由于多凸体模型考虑到凸体间相互作用对材料变形和失效的影响,发现在不同工况下材料表现出不同的抵抗刮擦和变形的能力,弹性刮头以及凸体间相互作用对纳观黏附摩擦特性产生重要影响。The dry friction mechanism is studied from the perspective of shear motion between nanoscale micro-convex bodies.Considering the influence of adhesion force,atomic transfer and interaction between convex bodies in the contact process of homogeneous elastic materials on the nano-adhesive friction contact process,the frictional response of the contact between a single-crystal copper elastic scratch head and an elastic multi-convex substrate under nanometer conditions is studied by molecular dynamics methods,and the friction law and contact deformation mechanism of the continuous contact between the elastic scratch head and the multi-convex substrate are analyzed.The results show that:The differences in lattice orientation lead to different degrees of wear between convex bodies,and the friction coefficient decreases with increasing lattice angle;The friction coefficient was found to decrease with increasing lattice angle under controlled temperature conditions;The analysis of the velocity for different convex body radius shows that the increase in velocity has a certain friction reduction effect;Since the multi-convex body model considers the effect of inter-convex body interactions on material deformation and failure,it is found that different resistance to scratching and deformation is exhibited under different operating conditions,and the elastic scratching head as well as interconvex body interactions have important effects on the nano-adhesive friction characteristics.

关 键 词：三维多凸体接触模型 单晶铜 摩擦黏附 分子动力学模拟 

分 类 号：TH113[机械工程—机械设计及理论]