薄膜润滑的结构和摩擦特性的分子动力学模拟  

Molecular Dynamics Simulation of the Structure and Friction Properties of Thin Film Lubrication

作　　者：白敏丽[1] 刘美[1] 王宇 吕继组[1] 胡成志[1] 王鹏[3] 

机构地区：[1]大连理工大学能源与动力工程学院,辽宁大连116024 [2]道依茨一汽大连柴油机有限公司研发部,辽宁大连116024 [3]大连理工大学土木工程学院,辽宁大连116024

出　　处：《润滑与密封》2017年第4期12-16,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(51476019;51276031;51376002)

摘　　要：研究以正庚烷作为润滑剂时薄膜润滑膜的结构特性和摩擦特性。采用分子动力学的方法建立薄膜润滑的计算体系,探究温度和压力对润滑油膜结构组成、滑移现象和摩擦特性的影响。结果表明,纳米量级润滑膜显现出"分层"的类固性;温度越高,固液分子之间吸附作用越强,越不易发生界面滑移,摩擦力越大;压力越大,层状结构越突出,类固性越强,越不易发生界面滑移,摩擦力越大;薄膜润滑是一种过渡状态,且是一种可以独立存在的过渡状态。The structural characteristics and friction properties of the lubrication film of thin film lubrication were studied with n-heptane as lubricant.The method of molecular dynamics was adopted to calculate the thin film lubrication system,and the influences on the film structure and component, the slip phenomenon and the friction properties by temperature and pressure were explored. Results show that nanometer level lubricating film shows layered performance similar to solid.The higher the temperature, the stronger the adsorption of solid and liquid molecules, the greater the friction, and the interface slip is less likely to occur.The greater the pressure,the more prominent the layered structure similar to solid,the greater the friction,and the interface slip is less likely to occur.Thin film lubrication is a transition state,which can exist independently.

关 键 词：分子动力学 薄膜润滑 正庚烷 

分 类 号：TH117[机械工程—机械设计及理论]