Effect of displacement on kinetic frictional behaviour between electro-deposited coating and AISI 52100 steel under fretting conditions

Abstract

This article investigates the effect of imposed displacement on the evolution of the kinetic friction coefficient between an epoxy-based cathodic electro-deposited coating and a steel ball. Small-amplitude reciprocal sliding is induced until the friction coefficient reaches a critical value. The kinetic friction coefficient is measured at various imposed displacements. Slip ratio, defined as the ratio of an actual sliding distance to imposed displacement, is determined to identify a slip regime. Experimental results show that a friction coefficient evolution varies in a gross slip regime according to imposed displacement amplitude. It is identified that the critical number of cycles to coating failure decreases with increased imposed displacement amplitude. The relation between the critical number of cycle and imposed displacement amplitude is found to be inverse power law.