The Effects of Artificially-Produced Defects on the Film Thickness Distribution in Sliding EHD Point Contacts

[+] Author and Article Information
C. Cusano

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, Ill. 61801

L. D. Wedeven

Lewis Research Center, NASA, Cleveland, Ohio 44135

J. of Lubrication Tech 104(3), 365-375 (Jul 01, 1982) (11 pages) doi:10.1115/1.3253222 History: Received February 01, 1981; Online November 13, 2009


The effects of artificially-produced dents and grooves on the elastohydrodynamic (EHD) film thickness profile in a sliding point contact are investigated by means of optical interferometry. The defects, formed on the surface of a highly polished ball, are held stationary at various locations within and in the vicinity of the contact region while the disk is rotating. It is shown that the defects, having a geometry similar to what can be expected in practice, can dramatically change the film thickness which exists when no defects are present in or near the contact. This change in film thickness is mainly a function of the position of the defects in the inlet region, the geometry of the defects, the orientation of the defects in the case of grooves, and the depth of the defect relative to the central film thickness.

Copyright © 1982 by ASME
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