The paper deals with the influence of contact kinematics on the coefficient of friction (COF) during sliding processes on a mesoscopic scale (asperity). The primary emphasis here is on the influence of contact angles, which is particularly significant for rough surfaces with steep asperities. The experimental setup here is sliding contact undergoing large deformations between topographies with a single asperity and multiple asperities. Since this question is numerically highly challenging, a frictional contact model using NURBS basis functions and mortar-based augmented Lagrangian method was developed here. During the process, the local normal force and frictional force change their magnitudes and directions highly dynamically. Due to large contact angles, a global interpretation of the COF differs from the locally assumed COF.

本文以介观尺度（粗糙）处理了滑动过程中接触运动学对摩擦系数（COF）的影响。这里的主要重点是接触角的影响，这对于具有陡峭凹凸的粗糙表面尤其重要。这里的实验装置是在具有单一凹凸和多个凹凸的形貌之间经历大变形的滑动接触。由于此问题在数值上极具挑战性，因此在此开发了使用NURBS基函数和基于灰浆的增强拉格朗日方法的摩擦接触模型。在此过程中，局部法向力和摩擦力会高度动态地改变其大小和方向。由于接触角较大，因此COF的全局解释与本地假定的COF不同。