Abstract
The contact conditions for fretting between spherical caps are reviewed. In particular, the relations between critical displacement and tangential force amplitudes for incipient slip on one hand, and normal force and frequency on the other, are analyzed. Experiments are carried, out with a testing apparatus, specially designed for fretting under controlled conditions within wide intervals of testing parameter values. An austenitic stainless steel and a Cu-3%Si alloy are investigated. It is confirmed that the critical tangential force is proportional to the normal force, and that the critical displacement is proportional to the 213 power of the normal force for two different frequencies, 300 and 800 Hz. The observed amplitude values are significantly higher than the theoretical values for the higher frequency. The frequency dependence is discussed.
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