An Experimental Evaluation of the Hamrock and Dowson Minimum Film Thickness Equation for Fully Flooded EHD Point Contacts

[+] Author and Article Information
K. A. Koye, W. O. Winer

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

J. of Lubrication Tech 103(2), 284-294 (Apr 01, 1981) (11 pages) doi:10.1115/1.3251647 History: Received February 29, 1980; Online November 17, 2009


Fifty-seven measurements of the minimum lubricant film thickness separating the elastohydrodynamically lubricated point contact of a steel crowned roller and a flat sapphire disk were made by an optical interferometry technique. The data collected were used to evaluate the Hamrock and Dowson minimum EHD film thickness model over a practical range of contact ellipticity ratio where the major axis of the contact ellipse is aligned both parallel and perpendicular to the direction of motion. A statistical analysis of the measured film thickness data showed that the experimental data averaged 30 percent greater film thickness than the Hamrock and Dowson model predicts.

Copyright © 1981 by ASME
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