Study of nanoscratching of polymers by using molecular dynamics simulations

查看全文 作　　者：YUAN [1]DanDan;ZHU [1]PengZhe;FANG [1]FengZhou;QIU [1]Chen

机构地区：[1]State Key Laboratory of Precision Measuring Technology and Instruments,Centre of MicroNano Manufacturing Technology,Tianjin University

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2013年第56卷第9期,共10页

基　　金：supported by the National Natural Science Foundation of China (Grant No.90923038);the National Basic Research Program of China (Grant No.2011CB706703);'111'project (Grant No.B07014);by the State Administration of Foreign Experts Affairs and the Ministry of Education of China 摘　　要：Molecular dynamic simulations are performed to study the nanoscratching behavior of polymers.The effects of scratching depth,scratching velocity and indenter/polymer interaction strength are investigated.It is found that polymer material in the scratching zone around the indenter can be removed in a ductile manner as the local temperature in the scratching zone exceeds glass transition temperature Tg.The recovery of polymer can be more significant when the temperature approaches or exceeds Tg.The tangential force,normal force and friction coefficient increase as the scratching depth increases.A larger scratching velocity leads to more material deformation and higher pile-up.The tangential force and normal force are larger for a larger scratching velocity whereas the friction coefficient is almost independent of the scratching velocities studied.It is also found that stronger indenter/polymer interaction strength results in a larger tangential force and friction coefficient. 关键词：分子动力学模拟聚合物材料玻璃化转变温度相互作用强度摩擦系数切向力材料变形法向力

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Study of nanoscratching of polymers by using molecular dynamics simulations

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