界面速度与温度滑移对有限长线接触纯滑动热弹流接触的影响  

Effects of Interfacial Velocity or Temperature Slips on Finite Line Contact Thermal EHL in Simple Sliding Motion

作　　者：张明宇 王静 ZHANG Mingyu;WANG Jing(College of Mechanical Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《摩擦学学报（中英文）》2024年第8期1092-1106,共15页Tribology

基　　金：国家自然科学基金项目(51875298);山东省自然科学基金项目(ZR2019MEE040);中央高校基本科研业务费专项资金;东华大学研究生创新基金项目(CUSF-DH-D-2023033)资助。

摘　　要：随着表面工程技术的发展,润滑界面发生滑移的现象已比较常见.除了发生界面速度滑移,在有显著温升的弹流接触界面也有可能发生温度滑移.本研究在有限长线接触纯滑动热弹流润滑问题的基础上,建立了4种界面滑移模型,采用数值分析方法,揭示了在运动和静止表面分别发生速度和温度滑移时接触区润滑特性的变化.研究发现,运动表面的速度滑移会阻碍接触区的润滑油流动,而静止表面的速度滑移则促进润滑油流动;运动表面的温度滑移会降低接触区内的温升,静止表面的温度滑移则会显著增加接触区的温升并降低摩擦系数.速度和温度滑移都可能将摩擦系数降到0.01以下,实现超滑,但静止表面的温度滑移对摩擦系数的影响更为显著.With the development of surface engineering technology,plenty of hydrophobic and oleophobic surfaces are designed so that the occurrence of interfacial slips has become quite common.For an interface in elastohydrodynamic lubrication(EHL)contact with obvious thermal rise,temperature slip should take place accompanying with the occurrence of velocity slip.Thus,for a thermal EHL contact,friction coefficient is possible to drop below 0.01 and reach a superlubricity level.In this study,based on a finite line contact simple sliding thermal EHL problem,numerical analyses were completed to reveal the changes in the lubrication characteristics when velocity or temperature slip occurred on the moving and stationary surfaces,respectively,together with the influence of velocity change on lubrication state in the contact zone.The work was also aimed to explore the reduction of the friction coefficient as well as the possible occurrence of superlubricity.The geometrical modeling of the finite line contact was based on the authors'previous design of the roller ends to obtain a beneficial lubrication state at the end of the contact zone that was least susceptible to severe stress concentration phenomena.The modified generalized Reynolds equation taking into account the interfacial velocity slip,the Ree-Eyring fluid flow model and respectively 4types of interfacial slip models were used to establish the mathematical models.The Reynolds equation was solved by the multigrid method,the elastic deformation by the multigrid integration method,and the temperature field by the column-column scanning technique.Velocity slip at the moving surface significantly reduced the lubricant flow rate in the contact zone,while velocity slip at the stationary surface acted the opposite way.All 4 slip models reduced the oil film thickness while the effect of the velocity slip on the moving surface was the most obvious.Velocity and temperature slips on the moving surface and velocity slip on the stationary surface all reduced the maximum thermal rise

关 键 词：速度滑移 温度滑移 热弹流润滑 有限长线接触 数值分析 超滑 

分 类 号：TH117.2[机械工程—机械设计及理论]