An Interferometric Study of the EHL of Rough Surfaces

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Abstract
The use of optical interferometry to study elastohydrodynamic lubrication was extended to a study of the lubrication of rough surfaces. The experiments were conducted using a simple sliding point contact rig. A smooth glass plate with a titanium dioxide semi-reflecting coating and a silicon dioxide spacer layer was rotated over a static EN 31 steel ball on which an artificial, two-dimensional roughness had been created. The two-dimensional nature of the roughness enabled a study of the effect of directional properties of roughness on elastohydrodynamic lubrication to be carried out. The lubrication of single asperities and asperity pairs was also investigated. The results of the study have shown that microelastohydrodynamic lubrication of asperities is possible. Interesting effects of cavitation between transverse asperity pairs have been noted.

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