Abstract
A laboratory apparatus has been designed for the evaluation of materials and lubricants in sliding friction and for the prediction of performance of a particular type of hydraulic pump. The metahydrodynamic correlation using f = αvaUb/pc for the region just below the hydrodynamic region was found to be applicable in all systems evaluated on the apparatus. It is shown that both hydrodynamiclike and metahydrodynamic behavior are dependent upon the materials and lubricant comprising the system. Solid to solid contact in the metahydrodynamic region appears to be a consequence of both film thickness and surface finish. Film collapse resulting from degassification of the supporting film is also shown to contribute to high friction development. Once solid to solid contact occurs, hydrodynamiclike or metahydrodynamic laws are obeyed and this depends principally upon the material combination and hardness of materials. Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference hel...
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