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RESEARCH PAPERS

Lubricant Limiting Shear Stress Effect on EHD Film Thickness

[+] Author and Article Information
B. Gecim, W. O. Winer

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga. 30332

J. of Lubrication Tech 102(2), 213-220 (Apr 01, 1980) (8 pages) doi:10.1115/1.3251474 History: Received July 12, 1979; Online November 17, 2009

Abstract

A Grubin-like EHD inlet analysis utilizing a non-linear viscous fluid model with a limiting shear stress is reported. The shear rheological equation requires only a low shear stress viscosity and the limiting shear stress both functions of pressure. Values employed for these properties are taken from measurements on typical lubricants. Reductions of EHD film thickness are found to be up to 40 percent compared with the standard Grubin prediction for typical operating conditions. Slide-roll ratio, limiting shear stress dependence on pressure, and atmospheric pressure value of limiting shear stress are new variables required to determine film thickness with the first two being more important than the last. The EHD film thickness is reduced by increasing slide-roll ratio and/or decreasing the pressure dependence of the limiting shear stress.

Copyright © 1980 by ASME
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