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RESEARCH PAPERS

Influence of Contact Temperature on Contact Fatigue Failure Forms: Part 2—The Test and Analysis

[+] Author and Article Information
Long-Qing Chen

Department of Mechanical Engineering, Zhengzhou Institute of Technology, Zhengzhou, 450002, People’s Republic of China

J. Tribol 115(3), 471-475 (Jul 01, 1993) (5 pages) doi:10.1115/1.2921661 History: Received May 15, 1992; Revised September 01, 1992; Online June 05, 2008

Abstract

The surface roughness of contacting parts have a strong influence on the failure form of contact fatigue. Pitting failure is liable to occur on the contact parts with rougher surface. The present test shows that a plastic deformation layer (PDL) will generally occur beneath the race surface of the parts which fail in pitting; and the near-surface cracks will initiate in the plastic deformation layer, these cracks grow gradually and finally result in fatigue failure where the depth of the fatigue pit are 0.1–0.2 mm. According to the author’s analysis of contact temperature and contact stresses, the present paper suggests: when the race surface of rolling specimen is rough, the contact temperature rise reduces the transient yield strength of the metal below the maximum contact shear stress at this position, thereby, resulting in a plastic deformation layer.

Copyright © 1993 by The American Society of Mechanical Engineers
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