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RESEARCH PAPERS

Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part III—Fully Flooded Results

[+] Author and Article Information
B. J. Hamrock

NASA-Lewis Research Center, Cleveland, Ohio

D. Dowson

Leeds University, Leeds, England

J. of Lubrication Tech 99(2), 264-275 (Apr 01, 1977) (12 pages) doi:10.1115/1.3453074 History: Received July 06, 1976; Online October 20, 2010

Abstract

Utilizing the theory developed by the authors in an earlier publication, the influence of the ellipticity parameter, the dimensionless speed, load, and material parameters on minimum film thickness was investigated. The ellipticity parameter was varied from one (a ball on a plate configuration) to eight (a configuration approaching a line contact). The dimensionless speed parameter was varied over a range of nearly two orders of magnitude. The dimensionless load parameter was varied over a range of one order of magnitude. Conditions corresponding to the use of solid materials of bronze, steel, and silicon nitride and lubricants of paraffinic and naphthenic mineral oils were considered in obtaining the exponent in the dimensionless material parameter. Thirty-four different cases were used in obtaining the minimum film thickness formula given below as

min=3.63U0.68G0.49W−0.073(1−e−0.68k)
A simplified expression for the ellipticity parameter was found where
k = 1.03RyRx0.64
Contour plots were also shown which indicate in detail the pressure spike and two side lobes in which the minimum film thickness occurs. These theoretical solutions of film thickness have all the essential features of the previously reported experimental observations based upon optical interferometry.

Copyright © 1977 by ASME
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