Torsion Tribological Behavior of Polytetrafluoroethylene Composites under Dynamic Normal Load: Effect of Dynamic Normal Load Amplitude

ABSTRACTThe torsion tribological behavior of polytetrafluoroethylene (PTFE) composites was investigated under different dynamic normal loads. The difference between the shapes of T–θ curves under static and dynamic normal loads indicates that the torsion regime was affected by the dynamic normal loads. Dynamic loads not only produced new frequency components but also enhanced the amplitude of frequency components produced by the static load. The biaxial dynamic stress and transformation of the torsion regime under dynamic loads produce higher wear than that of a static load. The wear mechanisms under static and dynamic loads are abrasive wear and adhesive and fatigue wear, respectively.