Abstract
Fretting fatigue damage formation in carbon steel S45C has been examined by using an interrupted fretting fatigue testing method, which consists of two-stage fatigue loading. The first stage is fatigue loading with fretting under one of the stress ratios R= -1, 0, 0.33 and 0.5, and the second stage is fatigue loading without fretting under R= 0.5. The minimum number of cycles, Ncr, in the first stage which caused a break in the second stage was 7.5 × 104, and was independent of R. The damage layer at Ncr was about one grain size, and was hardened due to the formation of fine cell structures. It was concluded that the fretting fatigue damage is accumulated in the early cycles of fretting, and does not depend on R.
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