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RESEARCH PAPERS

Thermoelastic Distortion of EHD Line Contacts During the Passage of Soft Debris Particles

[+] Author and Article Information
G. K. Nikas, R. S. Sayles, E. Ioannides

Mechanical Engineering Department, Imperial College of Science, Technology, and Medicine, South Kensington, London SW72BX, England

J. Tribol 121(2), 265-271 (Apr 01, 1999) (7 pages) doi:10.1115/1.2833930 History: Received July 24, 1997; Revised August 11, 1998; Online January 24, 2008

Abstract

During the passage of a debris particle through an EHD contact, mechanical stresses due to particle compression and thermal stresses due to particle frictional heating produce a thermoelastic/plastic stress field, which governs the way a possible damage is generated. In the present paper, the complete three-dimensional solution of the thermoelastic distortion of surfaces due to the compression of a soft, ductile debris particle in an EHD line contact is presented both theoretically and through a realistic example. It is found that thermal stresses increase the likelihood of yielding and produce a characteristic “omega” shaped thermoelastic displacement. The important outcome of this work is the construction of a map which shows the critical particle size to cause damage (plastic deformations) in combination with operational parameters as the lubricant film thickness and relative sliding velocity of the contact.

Copyright © 1999 by The American Society of Mechanical Engineers
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