A Surface Pitting Life Model for Spur Gears: Part I—Life Prediction

[+] Author and Article Information
J. W. Blake

Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235

H. S. Cheng

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

J. Tribol 113(4), 712-718 (Oct 01, 1991) (7 pages) doi:10.1115/1.2920683 History: Received March 26, 1990; Revised July 02, 1990; Online June 05, 2008


Surface pitting is a major failure mode for gears. Estimation of failure probability and service life are important in gear design. Current techniques give only a pass/fail rating based on semi-empirical methods. A predictive model for estimating service lives and failure probabilities has been developed. This paper discusses the life prediction analysis, which is based on propagation of a surface breaking crack under rolling/sliding contact conditions. The effects of both surface roughness and non-metallic inclusions can be included. While predicted lives are lower than expected, trends observed through parametric variation are consistent with service behavior.

Copyright © 1991 by The American Society of Mechanical Engineers
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