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The Contribution of a Sliding Velocity to EHL Film Thickness Distribution

[+] Author Affiliations
Milan Omasta, Ivan Krupka, Martin Hartl

Brno University of Technology, Brno, Czech Republic

Paper No. IJTC2012-61133, pp. 107-109; 3 pages
  • ASME/STLE 2012 International Joint Tribology Conference
  • ASME/STLE 2012 International Joint Tribology Conference
  • Denver, Colorado, USA, October 7–10, 2012
  • Conference Sponsors: Tribology Division
  • ISBN: 978-0-7918-4508-0
  • Copyright © 2012 by ASME


In general contact conditions, the surface velocities are variously oriented, thus the entrainment and sliding velocity act at different directions. The effects of magnitude and direction of the sliding velocity in elastohydrodynamic lubrication (EHL) circular contact have been investigated. Film thickness distribution has been obtained using thin-film colorimetric interferometry. It has been found that direction of sliding velocity with respect to entrainment velocity play a role in film thickness distribution, particularly at high slide-to-roll ratios. A superposition of the effects of a pure rolling and of an opposite sliding has been considered. The pure rolling condition creates typical horse-shoe shaped film, whereas under the opposite sliding condition (i.e. zero entrainment velocity) conical depression in the central area of Hertzian contact called “dimple” has been observed.

Copyright © 2012 by ASME
Topics: Film thickness



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