Fatigue Life Reduction of Roller Bearings Due to Debris Denting: Part I — Theoretical Modeling

Stress concentration due to debris denting in EHL contacts has been analyzed. Quantitative relationships between the geometry of surface indentation, contact load and the maximum stress and its location have been established. Based on these relationships and the Weibull weakest-link theory, a fatigue life reduction model is proposed. Parametric study shows that life reduction is primarily determined by dent slope and life reduction factor decreases as dent slope increases. Indentation area-density is another major factor that affects contact fatigue life. Life reduction factor decreases as dent area-density increases. Life reduction is also affected by contact load. While fatigue life decreases with increasing load, life reduction factor increases as load increases. Presented as a Society of Tribologists and Lubrication Engineers Paper at the STLE/ASME Tribology Conference in Orlando, Florida, October 11–13, 1999

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