Abstract
The effect of static contact load on the wear behavior of a carbon steel accompanied with ultrasonic vibration has been studied in unlubricated conditions using a pin-on-disk type wear testing machine. A remarkable increase in wear rate at a critical contact load Pocr was observed in the wear under vibration as in the case of usual wear, and the transition from mild to severe wear appeared. Pocr increased with the amplitude of ultrasonic vibration. In the severe wear region the wear rate was almost proportional to (α/2π)2(P/pm)(1-Θ)2. This value is considered to be an apparent area of real contact, where P is the mean dynamic contact load, α the contacting time (rad) of specimens during one cycle of vibration, and (1-Θ) the ratio of freshly sheared surface of asperities.
