Investigations on the Stick-Slip Behavior and Dynamic Interface Friction Mechanisms of Fiber Winding

Fiber winding can enhance the friction coefficient at the interface of ropes, thereby improving the security and stability of the entire mechanical system. Nevertheless, specific mechanisms underlying this phenomenon remain unclear, particularly concerning the velocity-dependent stick-slip model. An experimental system focused on the stick-slip behavior from fiber winding was designed to unveil principles governing two types of fiber sliding with different fiber types, contact conditions and loading velocities. The results indicate that the fiber elastic modulus and sliding velocity jointly determine the sliding state of the interface. Specifically, brittle fibers with a high elastic modulus exhibit an easier transition from a stick-slip state to a steady-slip state. The variation in the friction coefficient at different sliding velocities is more pronounced under lubricated conditions. Theoretical results indicate that the friction coefficient appears non-uniform across the interface, and is inversely proportional to the angle of entanglement. For high-modulus fibers, the sliding state exhibits stronger synchronization throughout the entire interface. This study provides theoretical and technical support for manipulating interface friction and improving the safe use of fiber winding.