The paper presents the results of a study of the influence of load-difference in reciprocating stroke on lubricated wear of mild steel against hardened steel. Reciprocating friction machine used for the wear tests is designed to give differential load in reciprocating strokes. The load-difference in the strokes is expressed by the load amplitude (P1-P2)/2, where P2 and P2 are applied loads for each stroke. In the initial stage, a higher wear rate is obtained under reciprocating than under one-way friction, due to the more plastic flow of the surface. In the steady stage, the influence of load-difference is larger than that in the initial one, and the wear mechanism is explained as a phenomenon of surface fatigue by considering the relation between the load amplitude and the rate of pit formations.
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