With optical interferometry technique, an interesting multi-dimple phenomenon has been discovered under pure-sliding conditions in the point contact between a glass disk and a 3-inch diameter steel ball. At low sliding speeds, two or three stable dimples can be generated in the contact, but at higher sliding speeds, such multi-dimples become unstable. At even higher sliding speeds, however, dimples become stable again, but two dimples become single dimple, or three become two. Numerical solutions of the steady-state thermal elastohydrodynamic lubrication (EHL) theory based on the Newtonian flow model can simulate the stable multi-dimples very well. By changing the slide-roll conditions from pure-rolling to pure-sliding, the theoretical analysis shows clearly that the stable multi-dimples are produced by the thermal effect through the familiar EHL pressure spike.
Formation Mechanism of Steady Multi-Dimples in Thermal EHL Point Contacts
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division June 28, 2001 revised manuscript received July 2, 2002. Associate Editor: C. H. Venner.
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Kaneta , M., and Yang, P. (March 19, 2003). "Formation Mechanism of Steady Multi-Dimples in Thermal EHL Point Contacts ." ASME. J. Tribol. April 2003; 125(2): 241–251. https://doi.org/10.1115/1.1506318
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