微动界面连续干摩擦行为的分子动力学模拟

doi:10.3901/JME.2018.03.082

机械工程学报 ›› 2018, Vol. 54 ›› Issue (3): 82-87.doi: 10.3901/JME.2018.03.082

微动界面连续干摩擦行为的分子动力学模拟

潘帅航^1,2, 尹念¹, 张执南^1,3

1. 上海交通大学机械与动力工程学院上海 200240;
2. 加州大学洛杉矶分校机械与航空航天工程系洛杉矶 90095 美国;
3. 中国科学研究院兰州化学物理研究所固体润滑国家重点实验室兰州 730000

收稿日期:2017-02-18 修回日期:2017-07-12 出版日期:2018-02-05 发布日期:2018-02-05
通讯作者: 张执南(通信作者),男,1978年出生,博士,副教授。主要研究方向为摩擦学设计、设计理论与方法。E-mail:zhinanz@sjtu.edu.cn
作者简介:潘帅航,男,1994年出生。主要研究方向为摩擦-微振动耦合。E-mail:luckypsh@g.ucla.edu
基金资助:
国家自然科学基金（51575340）、固体润滑国家重点实验室开放基金（LSL-1604）和上海航天技术研究院-上海交大航天先进技术联合研究中心（USCAST2016-13）资助项目。

Molecular Dynamics Simulation for Continuous Dry Friction on Fretting Interfaces

PAN Shuaihang^1,2, YIN Nian¹, ZHANG Zhinan^1,3

1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240;
2. School of Mechanical & Aerospace Engineering, University of California-Los Angeles, Los Angeles, 90095 USA;
3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000

Received:2017-02-18 Revised:2017-07-12 Online:2018-02-05 Published:2018-02-05

摘要/Abstract

摘要： 为探究微动界面连续干摩擦过程中的分子运动规律，以晶体硅-金刚石耦合微动摩擦副为研究对象，建立了单凸体固-固接触模型，并以摩擦力响应和摩擦力垂直方向（z向）力学响应为表征量进行了分子动力学模拟分析。结果表明，在多次摩擦接触间隙，微动界面之间存在连续、波动的摩擦力学响应；连续摩擦接触过程中，受黏滑现象、单凸体变形回复以及界面上被磨损原子重新分布释放应力等过程影响，摩擦间隙仍会产生一定的z向力学响应，该力学响应的大小甚至会超过之后摩擦接触状态的力学响应，从而影响到固-固耦合微动界面的摩擦力学特性。

关键词: 分子动力学, 连续摩擦, 微动界面, 微动磨损

Abstract: Aimed at exploring the continuous dry friction behavior at fretting interface, targeted at crystalline silicon-diamond coupled interface, the fretting interface model with single asperity for dry friction analysis is set up using LAMMPS (i.e., molecular dynamics simulation tool, MD). The micro-motion process is shown with clear images and symbolized with friction force response and the normal force. It is should be noted that during the whole process, including the intervals between direct friction contacts, there exists continuously turbulent force response. The results indicate that during the continuous single asperity contacts, influenced by the factors of stick-slip effects, deformation-recovery process and stress release of wore atoms, the friction contact intervals show friction response, possibly stronger than that of the direct friction contacts to the extent that the frictional characteristics of the coupled solid fretting interfaces can be affected.

Key words: continuous friction, fretting interfaces, fretting wear, molecular dynamics simulation

中图分类号:

TH133

潘帅航, 尹念, 张执南. 微动界面连续干摩擦行为的分子动力学模拟[J]. 机械工程学报, 2018, 54(3): 82-87.

PAN Shuaihang, YIN Nian, ZHANG Zhinan. Molecular Dynamics Simulation for Continuous Dry Friction on Fretting Interfaces[J]. Journal of Mechanical Engineering, 2018, 54(3): 82-87.

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微动界面连续干摩擦行为的分子动力学模拟

Molecular Dynamics Simulation for Continuous Dry Friction on Fretting Interfaces

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