A Sliding Wear Model for Partial-EHL Contacts

[+] Author and Article Information
Shifeng Wu, H. S. Cheng

Department of Mechanical Engineering, McCormick School of Engineering and Applied Science, Northwestern University, Evanston, IL 60208

J. Tribol 113(1), 134-141 (Jan 01, 1991) (8 pages) doi:10.1115/1.2920579 History: Received February 15, 1990; Revised May 14, 1990; Online June 05, 2008


A sliding wear model has been developed for partial-EHL contacts, in which both the thermal desorption wear mechanism at low asperity contact temperature and the oxidative wear mechanism at elevated asperity contact temperature are considered. To include micro-EHL effects, digitized actual surface roughness profiles are used in simulating two contacting rough surfaces, and in obtaining the asperity contact area and asperity contact temperature distributions within a Hertzian contact region. Wear measurements in a two-disk machine configuration have been made over a comprehensive range of slide-to-roll ratios. The experimental results show a continuous decrease in wear rate with the increase in slide-to-roll ratio when the slide-to-roll ratio is relatively small, and a drastic rise in wear rate when slide-to-roll ratio is further increased. The experimental wear rate curve as a function of slide-to-roll ratio verifies the model prediction. The drastic rise in wear rate with the increase in slide-to-roll ratio in the range of slide-to-roll ratio beyond unity seems to suggest that a transitional phenomenon exists in the relation between wear rate and slide-to-roll ratio.

Copyright © 1991 by The American Society of Mechanical Engineers
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