Investigations on the dynamic influence of the contact angle on frictional sliding processes between rough surfaces using NURBS and mortar-based augmented Lagrangian method

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.