Experimental and theoretical studies of scuffing behavior in piston-pin/piston contacts

A bench rig was built and used to study the scuffing mechanisms and the effects of sur-face roughness, clearance, and groove on scuffing in piston-pin/bore contacts for dynamic loadsand an oscillatory rotation. The experimental results show that the deterioration of the surfaceshear strength by fatigue cracks appears to contribute to the final scuffing, and the effects of thebore surface roughness and groove on the scuffing behavior are more significant than the clear-ance. A macro-micro approached scuffing model and a criterion for scuffing failure were developedappearing to be justifiable for the practical design and analysis of piston pin/bore bearings.