Abstract
In order to understand the dynamic characteristics of flexible seals for reciprocating motion, the relationship between film behavior between sealing surfaces and friction characteristics is investigated based on direct observations using the optical interferometry technique. A nitrile rubber band with a D shaped cross section instead of actual D-rings was pressed against an oscillating glass plate. The effects of the length of stroke and surface defects are also examined. It has been found that even in the mixed-lubrication regime rather thick oil films are formed during the reciprocation. However, when the length of stroke is less than a certain critical value, the film completely collapses even in the hydrodynamic lubrication range and the reciprocating motion is established by the deformation of the rubber specimen. The surface defects such as dents and bumps bring about local fluctuation in film thickness downstream of these defects.
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