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Some Effects of Tensile Stressing on Rolling Contact Fatigue Initiation
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Abstract
The effects of surface and near surface tensile stresses on rolling contact fatigue initiation are discussed, based upon measurement of residual stresses and observations of bearings run under both full lubrication (high lambda) and thin film (low lambda) conditions. Previous work considers the applied tensile stresses of interference fit and high speed rotation which effect the macroscopic Hertzian stress field. This paper also takes into account the localized contact stresses and residual stresses at the microscopic sites of stress concentrations. The origins of most rolling contact fatigue failures are at or very near the rolling contact surfaces. Residual stress data for through hardening and case hardening steels are presented. High tensile stresses on the order of 700 MPa (100 ksi) from poor grinding and 480 MPa (70 ksi) from high DN operation cause early failures. A low tensile stress of 70 MPa (10 ksi) is used frequently for interference fit and has no significant effect on life. In between these levels, the failure occurrence for applied tensile stressing is statistical, with some parts failing while others survive. Additional possible sources of tensile stresses are residual stresses from heat treating, residual stresses developed by micro plastic deformation when rolling over asperities, and stresses of rolling friction which are caused by sliding motion and transmitted through the lubrication film. Stresses from different sources can combine to reach the critical threshold for crack initiation. The chance of this happening accounts for the statistical nature of life results.
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Authors
Citation
Pearson, P., "Some Effects of Tensile Stressing on Rolling Contact Fatigue Initiation," SAE Technical Paper 961829, 1996, https://doi.org/10.4271/961829.Also In
References
- Moyar, G.J. “A Critique of Rolling Contact Fatigue Criteria for Bearing Rings with Hoop Stresses” ASME/STLE Tribology Conference Lahaina, Hawaii October 1994
- Hamer, J.C. Sayles, R.S. Ioannides, E. “An Experimental Investigation Into the Boundaries of Smearing Failure in Roller Bearings” Transactions of the ASME 113 January 1991 102
- Bair, S. “Recent Developments in High Pressure Rheology of Lubricants” Leeds-Lyon Symposium 1994
- Harris, T.A. Rolling Bearing Analysis Third Edition John Wiley & Sons 1991 450
- Chiu, Y.P. “The Role of Residual (or Internal) Stress on Microspalling of Rolling Contacts” International Rolling Element Symposium '91 Orlando, Florida April 1991
- Monnot, J. Heritier, B. Cogne, J.Y. “Relationship of Melting Practice, Inclusion Type and Size with Fatigue Resistance of Bearing Steels” Effect of Steel Manufacturing Processes on the Quality of Bearing Steels Hoo J.J.C. ASTM STP 987 1988 149
- Clark, J.C. “Increased Durability of Rolling Contact Bearings” Symposium on Current Practices and Trends in Mechanical Failure Prevention, 44th Meeting Mechanical Failures Prevention Group Virginia Beach, Virginia April 1990
- Braza, J.F. Pearson P.K. “Tribological and Metallurgical Evaluation of Ferritic Nitrocarburized M50 and M50 NiL Steels” Creative Use of Materials for Rolling Contact Bearings Hoo J.J.C. ASTM STP1195 1993 49
- Pearson, P.K. “Fatigue and Fracture of High Hardness Steels Under Low Rolling Contact Stresses” SAE Peper 901628 , International Off-Highway and Powerplant Congress September 1990