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RESEARCH PAPERS

Optical Interferometric Observations of the Effects of a Bump on Point Contact EHL

[+] Author and Article Information
M. Kaneta, T. Sakai, H. Nishikawa

Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu 804 Japan

J. Tribol 114(4), 779-784 (Oct 01, 1992) (6 pages) doi:10.1115/1.2920948 History: Received July 09, 1991; Revised June 01, 1992; Online June 05, 2008

Abstract

The effects of surface kinematic conditions on micro-elastohydrodynamic lubrication (micro-EHL) are investigated under rolling and/or sliding point contact conditions using the optical interferometry technique. A long bump of chromium sputtered on the surface of a highly polished ball is used as a model asperity. It is shown that the film thickness distribution or the elastic deformation of the bump is influenced significantly by the surface kinematic conditions and the orientation of the bump. An interesting phenomenon is also found when contacting surfaces move with different speeds; the thin film formed on a transversely oriented bump existing at the entrance of the contact travels through the contact region at the average speed of the surfaces. The experimental results obtained qualitatively confirm published numerical simulations.

Copyright © 1992 by The American Society of Mechanical Engineers
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