Files in this item



application/pdfTAM182-UILU-ENG-1967-0478.pdf (13MB)
(no description provided)PDF


Title:Mechanics analysis of rolling element failures
Author(s):Moyar, G.J.
Rolling Elements
Abstract:Research pertinent to three failure modes of rolling elements—cumulative deformation, fatigue pitting and excessive or variable rolling resistance—is critically reviewed. Features of the first two modes are analyzed and experimentally explored. When metal bodies are repeatedly pressed together there is no significant accumulation of plastic deformation with cycles. However, when they are repeatedly rolled together, accumulation of plastic deformation is measurable even in hard steel at room temperature. Results of experiments with annealed brass rolling elements and auxiliary combined tension-torsion tests confirm that the accumulation of plastic strain under complex combined stress cycles is responsible for the cyclic increase in radial deformation and rolling track width. In addition to the high temperature rolling contact situation, this material behavior may be expected as the basis of gross dimensional instability in other applications. The mechanism responsible for cumulative deformation is of fundamental as well as technological significance. It provides a basis for understanding the beneficial effect of initial overload or mechanical work in stabilizing material to cyclic stress and points out the necessity of a new suitability criterion for materials in high temperature bearing application. Discrepancies in pitting endurance values from various bench rig testers and actual bearings result from the influence of rolling element configuration and size, as well as the ignorance of complete dynamic test conditions. On the basis of an analysis of the effect of configuration on critical stress range and a simple statistical size effect argument, the apparent discrepancies for one rig type having various rolling element profile radii are largely resolved.
Issue Date:1960-12
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 182
Genre:Technical Report
Rights Information:Copyright 1960 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

This item appears in the following Collection(s)

  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

Item Statistics