单层悬空石墨烯表面摩擦的载荷依赖性  

Load Dependence of the Friction on a Suspended Single-Layer Graphene

作　　者：张红卫 屈进峰 张景楠 ZHANG Hongwei;QU Jinfeng;ZHANG Jingnan(School of Urban Planning and Municipal Engineering,Xi'an Polytechnic University,Xi'an 710048,Shaanxi,China;School of Science,Xi'an Shiyou University,Xi'an 710056,Shaanxi,China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710048 [2]西安石油大学理学院,陕西西安710056

出　　处：《力学季刊》2025年第1期222-229,共8页Chinese Quarterly of Mechanics

基　　金：陕西省自然科学基础研究计划(2022JQ-057);陕西省自然科学基础研究计划(2023-JC-QN-0400)。

摘　　要：近年来,纳米摩擦学领域高度关注石墨烯及其相关二维材料的摩擦问题,并在理论研究、实验探索和计算模拟等方面取得了重要进展.由于纳观尺度摩擦过程极为复杂,相关摩擦机理仍未完全明晰,因此需从原子层次深入探究其摩擦机制、揭示摩擦规律.本文采用分子动力学模拟方法,对悬空的单层石墨烯表面上金刚石探针的滑动摩擦过程进行研究.探究法向载荷对摩擦行为的影响,分析摩擦力与实际接触面积的依赖关系.结果表明,摩擦力与法向载荷及实际接触面积之间的关系并非线性,这与传统块体材料的摩擦规律存在显著差异.具体来讲,在正载荷区间,摩擦力随着载荷的增大而逐渐增大;在负载荷区间,摩擦力几乎不受载荷变化的影响.这有助于从原子层面揭示二维材料在纳米尺度下的摩擦行为,为纳米器件的设计和纳米摩擦学的发展提供理论支持.Graphene and its related two-dimensional materials have become a hot topic in the field of nanotribology.In recent years,many significant progresses have been made in theoretical,experimental,and computational simulation studies.Due to the extremely complex nature of nanoscale friction processes,the underlying mechanisms of friction are not yet fully understood.Therefore,it is necessary to delve into the mechanisms of friction and reveal the laws of friction on the atomic-scale.In this paper,the sliding friction behavior of a diamond probe on a suspended single-layer graphene surface is studied based on molecular dynamics simulation.The dependence of the friction on the normal load and the relationship between friction and actual contact area are considered.The results show that there is a nonlinear relationship between friction force and normal load(actual contact area),which is significantly different from the friction laws of bulk materials.Specifically,the friction force gradually increases with the load in the positive load range.However,the friction force is almost unaffected by changes in the load in the negative load range.The current research findings help to understand the nanoscale friction behavior of two-dimensional materials from an atomic perspective.This research can also provide new ideas and theoretical references for the design of nanodevices and the development of nanotribology.

关 键 词：纳米摩擦 石墨烯 载荷 接触面积 分子动力学 

分 类 号：O343.3[理学—固体力学]