Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part II—Ellipticity Parameter Results

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

NASA Lewis Research Center, Cleveland, Ohio

D. Dowson

Leeds University, Leads, England

J. of Lubrication Tech 98(3), 375-381 (Jul 01, 1976) (7 pages) doi:10.1115/1.3452861 History: Received June 19, 1975; Online October 20, 2010


A numerical solution of the isothermal elastohydrodynamic problem for point contacts has been presented which reproduces all the essential features of the previously reported experimental observations based upon optical interferometry. In particular, the two “side lobes” in which minimum film thickness regions occur are shown to emerge in the theoretical solutions. The influence of the ellipticity parameter upon solutions to the point contact problem has been explored in the present paper. The ellipticity parameter (k) was varied from one (a ball on a plate) to eight (a configuration approaching line contact), and it has been shown that the minimum film thicknesses can be related to the well known line contact solutions by remarkably simple expressions involving either (k) or the effective radius of curvature ratio (Ry /Rx ).

Copyright © 1976 by ASME
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