Effect on Friction for Different Parameters in Roll-Slip of Polyamide-Steel Nonconformal Contacts

摘要

Standards for tribological testing focus mainly on sliding, but in applications like gears, rollers, etc., rolling appears together with sliding, resulting in roll-slip situations. In this study, the roll-slip behavior of polymer materials was tested using a twin-disc experimental test setup. Three different loads of 61 N (13 MPa), 110 N (18 MPa), and 161 N (22 MPa) together with five different speeds ranging from 10 to 700 rpm were used for a slip ratio of 15%. Two different counter materials were used: tool steel (M238) and nonalloyed structural steel (S335). Both of the counter materials showed a friction behavior that was almost linear to the increase in load for high speeds at 700 rpm. But at speeds below 200 rpm the tool steel showed an exponential behavior. At low loads (61 and 110 N) there was an exponential increase in friction force that became more linear after 110 N. From a velocity point of view both of the counter materials showed similar friction behavior with a different value in friction force. By comparing the behavior for both of the counter materials against polyamide 6, the tool steel showed an increased friction force that makes the nonalloyed structural steel a more suitable counter material for polyamide.