Point Contact EHL Based on Optically Measured Three-Dimensional Rough Surfaces

[+] Author and Article Information
Dong Zhu

Eaton Corporation, Corporate R & D Detroit Center, 26201 Northwestern Highway, Southfield, MI 48037

Xiaolan Ai

Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208

J. Tribol 119(3), 375-384 (Jul 01, 1997) (10 pages) doi:10.1115/1.2833498 History: Received February 19, 1996; Revised June 01, 1996; Online January 24, 2008


This paper presents a numerical solution for the elastohydrodynamic lubrication in point contacts, using optically measured three-dimensional rough surface profiles as input data. The multi-grid computer program originally developed by Ai and Cheng (1993, 1994) is modified, so that both contacting surfaces can be three-dimensional measured rough surfaces moving at different velocities. Many different engineering surfaces are measured and analyzed in the present study, demonstrating that the numerical analysis is practical for real surfaces of bearings, cams, gears and other components, as long as a significant EHL film still exists. In addition, discussions are given in this paper for the effects of three-dimensional rough surface topography, which is related to machining process. It appears that, for the circular contact cases analyzed, surface roughness texture and orientation do not have a significant effect on the average film thickness, but they do affect the maximum pressure peak height and asperity deformation in the contact zone considerably.

Copyright © 1997 by The American Society of Mechanical Engineers
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