Debris Denting Effects on Elastohydrodynamic Lubricated Contacts

[+] Author and Article Information
Gang Xu, Farshid Sadeghi

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906

J. David Cogdell

Mechanical/Tribochemical Sciences, The Timken Company, Canton, OH 44706

J. Tribol 119(3), 579-587 (Jul 01, 1997) (9 pages) doi:10.1115/1.2833539 History: Received January 09, 1995; Revised July 20, 1995; Online January 24, 2008


A finite element model was developed to investigate the effects of a spherical debris on elastohydrodynamically lubricated rolling/sliding contacts. Three dimensional dent profiles were obtained using finite element method showing horseshoe shape material pile-up along the rolling direction. The dent profiles obtained from the finite element analysis (FEA) were compared with the experimental results. There is good qualitative agreement between FEA and experimental dent profiles. The FEA dent profiles were then used in a time dependent thermal elastohydrodynamic lubrication (EHL) point contact model to analyze the dent effects on the pressure, film thickness and temperature profiles. The presence of a dent in lubricated contacts generates high pressure spikes and increases the peak temperature. The internal stresses were calculated based on the pressure and traction data obtained from the EHL analysis. The results indicate that a dent created by a debris will cause the internal maximum Von Mises stress to occur near the surface, which contributes to surface initiated failures.

Copyright © 1997 by The American Society of Mechanical Engineers
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