Static friction of normal and reversed metal–polymer sliding pairs

Abstract The frictional cooperation of materials with different hardnesses occurs in machine elements one the following two variants: simple or reversed friction pairs. For a sliding pair, materials' deformation area (contact area) does not move over surface polymeric element during their interaction. In case pairs, contact changes its position as it moves polymer element. Tribological tests selected pairs (polymer on steel polymer) static were carried out tribotester for reciprocating motion. polymers research popular engineering applications: ultra-high molecular weight polyethylene (PEUHMW), polyoxymethylene (POM) and polytetrafluoroethylene (PTFE). These cooperated C45 at unit pressure ( P = 0.5; 1; 2 [MPa]) dry conditions. measurement results showed significant influence material combination variant (metal–polymer, polymer–metal) value coefficient. all tested combinations which sample (pin) slid plate, coefficient was higher than when worked plate.