The minimum hydrodynamic oil-film thickness of a short journal bearing is defined as that value of the minimum oil-film thickness at which marginal lubrication procedures initially begin to be substituted for full hydrodynamic-film lubrication. This appears to occur when the minimum oil-film thickness equals the sum of the predominant-peak surface roughnesses of the bearing and journal measured in the circumferential direction after run-in of the bearing and journal pair.

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