摘要
为探求表面形貌参数与粗糙接触界面流体动压润滑和摩擦性能之间的关系,应用有限差分法求解雷诺方程,结合膜厚方程和剪切力(摩擦力)方程,获得了随机粗糙表面接触压力和摩擦力的三维分布状态.通过对三维粗糙随机接触表面进行计算机模拟仿真,理论模型和计算方法得到了验证.随机粗糙接触载荷和摩擦力均随ISO 25178表面形貌参数国际标准中表面高度均方根偏差、表面高度分布偏态和表面展开面积比的增加而非线性增加,随自相关最快衰减率的增加而显著减小,揭示了表面形貌中"峰"和"谷"的特征对接触界面承载能力和摩擦力的影响.研究结果为进一步表面形貌的功能性表征研究提供了理论基础.
In order to explore the relationship between surface topography parameters and fluid dynamic pressure lubrication and friction properties of rough contact interface,the Reynolds equation was solved by finite difference method.Combined with the film thickness equation and shear force(friction)equation,the three-dimensional distribution of contact pressure and friction on random rough surface was obtained.The theoretical model and calculation method were validated through computer simulation of three-dimensional random rough surface.Random rough contact load and friction increase nonlinearly with the increase of some surface topography parameters,such as surface height in the root mean square deviation,surface height distribution skewness and surface area ratio which are in the ISO 25178 international standard.However,they decrease significantly with the increase of the maximum decay rate of autocorrelation.It is revealed that the influence of the characteristics of"peak"and"valley"on the bearing capacity and friction force of contact interface.The results provide a theoretical basis for functional characterization of surface topography.
引文
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