纳米粗糙间隙中季戊四醇四酯的薄膜润滑行为  

Film Lubrication Behavior of Pentaerythritol Tetraester in Nano Rough Gap

作　　者：张晋铭[1] 潘伶[1] 吕志田 陈有宏 ZHANG Jinming;PAN Ling;LV Zhitian;CHEN Youhong(School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou Fujian 350116,China)

机构地区：[1]福州大学机械工程及自动化学院,福建福州350116

出　　处：《润滑与密封》2020年第11期65-72,共8页Lubrication Engineering

基　　金：国家自然科学基金项目(51875106);福建省自然科学基金项目(2016J01226);晋江市福大科教园区发展中心科研项目(2019-JJFDKY-54).

摘　　要：采用分子动力学模拟方法建立光滑和粗糙2种固体壁面结构,研究季戊四醇四酯润滑剂在不同压力、薄膜厚度下,在恒定剪切速度和温度下的薄膜润滑行为。分析壁面间润滑薄膜的密度分布,以及剪切过程中润滑剂的速度分布。输出固体壁面在x向和z向的力学响应,并计算摩擦因数。结果表明:表面纳米结构降低了润滑薄膜的厚度,减弱了润滑薄膜分层现象;当润滑薄膜厚度较大时,V形纳米沟槽有助于减小薄膜润滑系统的摩擦因数;润滑薄膜厚度较小时,V形纳米沟槽表面润滑状态容易从流体润滑转变到边界润滑状态,摩擦因数增大。Molecular dynamics simulation was used to establish smooth and rough solid wall structures.The film lubrication behavior of pentaerythritol tetraester lubricant at constant shear rate and fixed temperature under different pressures and film thickness was studied.The density distribution of the lubricating film between the walls and the velocity distribution of the lubricant during the shearing process were analyzed.The mechanical responses of solid walls in x and z directions were output,and the friction coefficients were calculated.The results show that the surface nanostructure reduces the thickness of lubricating film and reduces the delamination of lubricating film.When the thickness of lubricating film is large,V-type nanogrooves help to reduce the friction coefficient of film lubricating system.When the thickness of lubricating film is small,V-type nano-groove surface lubrication state is easily transitioned from fluid lubrication to boundary lubrication,and the friction coefficient is increased.

关 键 词：薄膜润滑 粗糙表面 分子动力学 摩擦特性 

分 类 号：TH117.2[机械工程—机械设计及理论]