Microscale friction phenomena in oscillatory sliding contacts

Microscale friction phenomena encountered in oscillatory sliding contacts were examined with a special reciprocating surface micromachine. Variations in static and dynamic friction forces were tracked in situ throughout testing under controlled loading and environmental conditions. Stick-slip surface interactions emerged at high numbers of sliding cycles. An unexpected binary friction behavior occurred as sliding transitioned between two-body and three-body conditions due to the formation of fine wear particles. The dominant friction mechanisms arising at the asperity scale are interpreted in the context of temporal evolutions of the static and dynamic friction forces and the decrease of the static and dynamic operational safety factors with accumulating sliding cycles. An important finding is that oscillating microdevices tend to fail in static friction mode rather than in dynamic friction mode. The results of this study illustrate the important role of microscale stick-slip phenomena in high-speed oscil...

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