Tribological Behavior of Polytetrafluoroethylene under Unidirectional Rotation,Reciprocating Sliding,and Torsion Motion

The experimental friction coefficient of polytetrafluoroethylene (PTFE) increased in the order of unidirectional rotating motion (URM), reciprocating sliding motion (RSM), and face-on-face torsion motion (FTM), whereas the wear mass loss decreased. The contact zone of PTFE composites exhibited different wear mechanisms with various motions. Under URM, RSM, and FTM, the wear particles were presented as banding, long strips, and irregular floccus clumps. The higher shear force produced by more coupled nodes would result in a higher friction coefficient. The accumulated elastic hysteresis and plastic deformation in corresponding trajectories potentially enabled a better understanding of the particle morphology under URM, RSM, and FTM, respectively.