Scale Effects of Elastic-Plastic Behavior of Microscopic Asperity Contacts

[+] Author and Article Information
I. A. Polonsky, L. M. Keer

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

J. Tribol 118(2), 335-340 (Apr 01, 1996) (6 pages) doi:10.1115/1.2831305 History: Received February 17, 1995; Revised June 26, 1995; Online January 24, 2008


Scale effects of elastic-plastic asperity microcontact behavior are studied theoretically using a new simulation method developed by the authors. Contact plastic deformation is described in terms of discrete dislocations, which allows the model to be made scale-sensitive. The present work deals with two-dimensional asperity microcontacts. It is found that when asperity size decreases and becomes comparable to the characteristic microstructural length, contact plastic deformation becomes increasingly difficult, and finally impossible. The effect of a simultaneous decrease in the asperity size and the microstructural length is also studied.

Copyright © 1996 by The American Society of Mechanical Engineers
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