Evaluation of mechanical contact between metallic surfaces

Abstract eng:
In case of machines or other metallic structures the internal damping is usually negligible compared to the dissipation due to micro-slips at frictional contacts between machine parts. Consequently, one of the most challenging problems in modal analysis is the proper evaluation of the effects of contact properties on the modal damping. The frictional dissipation strongly depends on the actual contact patch, which is hard to determine in case of macroscopically matching surfaces. In the present paper, an experimental technique is proposed for the evaluation of the contact pattern by the measurement of electric field potentials.

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