Friction Characteristics of Nanoscale Sliding Contacts between Multi-Asperity Tips and Textured Surfaces

查看全文 作　　者：TONG [1]Ruiting;LIU [1]Geng;LIU [1]Tianxiang

机构地区：[1]Shaanxi Engineering Laboratory for Transmissions and Controls, Northwestern Polytechnical University

出　　处：《Chinese Journal of Mechanical Engineering》索引2013年第26卷第6期,共9页

基　　金：supported by National Natural Science Foundation of China(Grant Nos.51205313,50975232);111 Project(Grant No.B13044);Northwestern Polytechnical University Foundation for Fundamental Research,China(Grant No.JC20110249) 摘　　要：Nanoscale sliding contacts of smooth surfaces or between a single asperity and a smooth surface have been widely investigated by molecular dynamics simulations,while there are few studies on the sliding contacts between two rough surfaces.Actually,the friction of two rough surfaces considering interactions between more asperities should be more realistic.By using multiscale method,friction characteristics of two dimensional nanoscale sliding contacts between rigid multi-asperity tips and elastic textured surfaces are investigated.Four nanoscale textured surfaces with different texture shapes are designed,and six multi-asperity tips composed of cylindrical asperities with different radii are used to slide on the textured surfaces.Friction forces are compared for different tips,and effects of the asperity radii on the friction characteristics are investigated.Average friction forces for all the cases are listed and compared,and effects of texture shapes of the textured surfaces are discussed.The results show that textured surface II has a better structure to reduce friction forces.The multi-asperity tips composed of asperities with R=20r0(r0=0.227 7 nm)or R=30r0get higher friction forces compared with other cases,and more atoms of the textured surfaces are taken away by these two tips,which are harmful to reduce friction or wear.For the case of R=10r0,friction forces are also high due to large contact areas,but the sliding processes are stable and few atoms are taken away by the tip.The proposed research considers interactions between more asperities to make the model approach to the real sliding contact problems.The results will help to vary or even control friction characteristics by textured surfaces,or provide references to the design of textured surfaces. 关键词：粗糙表面表面纹理滑动接触摩擦特性粗糙峰纳米级触点分子动力学模拟

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Friction Characteristics of Nanoscale Sliding Contacts between Multi-Asperity Tips and Textured Surfaces

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