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RESEARCH PAPERS

Experimental and Theoretical Investigation on Rolling Contact Fatigue of 52100 and M50 Steels Under EHL or Micro-EHL Conditions

[+] Author and Article Information
D. Nélias, M.-L. Dumont, F. Couhier

Laboratoire de Mécanique des Contacts, CNRS UMR 5514, INSA de Lyon, 20 Av. A. Einstein, 69621 Villeurbanne Cedex, France

G. Dudragne

SNR Roulements, BP 2017, 74010 Annecy Cedex, France

L. Flamand

Laboratoire de Mécanique des Contacts, CNRS UMR 5514, INSA de Lyon, 20 Av. A Einstein, 69621 Villeurbanne Cedex, France

J. Tribol 120(2), 184-190 (Apr 01, 1998) (7 pages) doi:10.1115/1.2834407 History: Received June 27, 1996; Revised January 25, 1997; Online January 24, 2008

Abstract

The purpose of this investigation is to clarify the role of roughness on rolling contact fatigue. Tests have been carried out on a two-disk machine, for two rolling bearing steels (52100 and M50), two surface roughnesses corresponding to EHL and micro-EHL conditions (two different surface finishing), three normal loadings (1.5, 2.5 and 3.5 GPa), and under pure rolling or rolling plus sliding conditions. No surface damage has been observed up to 50 106 cycles for tests with smooth specimens. Tests with rough specimens have produced a typical surface damage, called here surface distress, made of a large population of asperity-scale micro-cracks and micro-spalls. The paper describes the surface distress observed, such as micro-cracks and micro-spalls. Surface damages obtained are different for tests under pure rolling conditions and tests under rolling plus sliding conditions. Therefore, the role of the friction direction is underlined. A link is made between our experimental observations and calculations that have been carried out using a transient EHL model. The influence of an indent in a line contact, simulating a micro-spall, is studied. Surface pressure and associated sub-surface stress field are analyzed versus the sliding direction.

Copyright © 1998 by The American Society of Mechanical Engineers
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