Elastohydrodynamic Lubrication of Squeeze Films : Part 2, Two spherical bodies lubricated with grease

概要

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In this paper, an elastohydrodynamic squeeze problem between two spherical bodies lubricated with grease is studied. In this analysis, grease is assumed to be a Bingham solid whose plastic viscosity and yield stress depend on the pressure, and the time-dependent elastohydrodynamic equation for a Bingham solid is solved by the same method presented in the author's previous paper. It is discussed how the core formation, which is the inherent property of a Bingham flow, affects the film profile and the load capacity. In the experiment, a spherical body is dropped onto a lubricated optical flat and the film profiles are measured using the interferometric method and photographed by a highs peed cinecamera. It is discussed, using grease and gear oil, how the various lubricants affect the film profile. analytical results and experimental ones are compared.
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