机械科学与技术2024，Vol.43Issue(8)：1386-1393,8.DOI:10.13433/j.cnki.1003-8728.20230035
混合润滑状态下非高斯表面法向接触刚度研究
Study on Normal Contact Stiffness of Non-Gaussian Surface Under Mixed Lubrication Condition
摘要
Abstract
In order to reveal the influence of surface morphology characteristics on contact characteristics under mixed lubrication state,the solid-liquid contact problem of non-Gaussian rough surface with micro-convex height under normal static load was studied.Solid-liquid contact interface includes solid contact of asperity and fluid contact of medium.For the solid contact part,the contact characteristics of non-Gaussian equivalent rough surface were analyzed based on elastic-plastic solid mechanics,and the normal contact stiffness calculation model of non-Gaussian rough surface was established considering the elastic-plastic deformation of asperity.For fluid contact,a closed oil pit contact model considering the kurtosis/skewness distribution of asperity is proposed.The effects of normal pressure,non-Gaussian surface roughness parameters and lubricating oil viscosity coefficient on the normal contact stiffness of the solid-liquid interface of mixed lubrication were revealed by simulation analysis.The normal contact stiffness of the solid-solid interface without lubrication medium and that of the solid-liquid interface with lubrication medium were compared and analyzed.The results show that the normal contact stiffness of solid-liquid interface and solid-solid interface increases non-linearly with the increase of normal load,and the contact stiffness of solid-liquid interface is slightly larger than that of solid-solid interface.The greater the viscosity of lubricating medium,the greater the contact stiffness;The kurtosis and skewness of non-Gaussian distribution have significant influence on the contact stiffness of the joint surface of mixed lubrication.Compared with the Gaussian surface with zero skewness distribution,the non-Gaussian surface with negative skewness distribution usually has larger contact stiffness.Under light load,the influence of kurtosis on contact stiffness cannot be ignored.Therefore,by changing the kurtosis/skewness of the contact surface,increasing the normal load and increasing the viscosity of the lubricating medium,the normal contact stiffness of the solid-liquid interface in mixed lubrication state can be effectively improved.关键词
机械结合面/非高斯粗糙表面/混合润滑/固-液结合面/接触刚度Key words
mechanical interface/non-Gaussian rough surface/mixed lubrication/solid-liquid interface/contact stiffness分类
机械制造引用本文复制引用
高志强,席云鹏,彭丽霞,傅卫平,王雯,王双琦..混合润滑状态下非高斯表面法向接触刚度研究[J].机械科学与技术,2024,43(8):1386-1393,8.基金项目
国家自然科学基金面上项目(52375127)与陕西省青年科技新星项目(2024ZC-KJXX-057) （52375127）
