Abstract
The effect of an oscillating normal force (fretting Mode II) on the degradation mechanism in an alumina versus a WC-Co ball-on-flat contact is presented. A sinusoidal oscillation of the normal force at a fixed frequency and normal force amplitude was applied for different numbers of cycles. The evolution of the surface damage with an increasing number of cycles at a constant force amplitude is reported. In general, wear is taking place in the slip region on alumina balls and on WC-Co flats. The oscillating normal force generates fatigue cracks on the surface of the alumina balls, but not on the WC-Co flats. Fatigue crack initiation life under fretting Mode II test conditions is evaluated for alumina in a plot of maximum normal load versus number of fretting cycles.
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