Friction regimes in the lubricants solid-state regime

Dirk J. Schipper, O. Maathuis

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Friction measurements were performed in the lubricant's solid-state regime to study the transition from full-film lubrication, in which the separation is maintained by a solidified lubricant, to mixed lubrication. Special attention is paid to the influence of temperature (inlet viscosity) and roughness on this transition. The friction measurements showed that in the lubricants solid-state region three lubrication modes can be distinguished: A) full-film lubrication; separation is maintained by a solid film (S-EHL), B) mixed lubrication (ML); the load is carried by the interacting asperities as well as the lubricant (acting like a solid or as a liquid) and C) boundary lubrication (BL). Further, the dependency of the transition S-EHL to ML on temperature (inlet viscosity) depends on the lubricant used. The transition S-EHL to ML depends slightly more on roughness as found for L-EHL to ML transition. Finally, the film thickness formulas developed for EHL contacts in which the lubricant behaves as a liquid become doubtful when operating in the lubricant solid-state regime. This on the basis of the calculated film thickness over roughness ratios for the transition S-EHL to ML.
Original languageUndefined
Title of host publicationProceedings 1994 Leeds-Lyon Tribology conference, vol. 30
EditorsD. Dowson, C.M. Taylor, T.H.C. Childs, G. Dalmaz
ISBN (Print)0444 822631
Publication statusPublished - 13 Feb 1995
Event21st Leeds-Lyon Symposium on Tribology 1994 - University of Leeds, Leeds, United Kingdom
Duration: 6 Sep 19949 Sep 1994
Conference number: 21

Publication series

NameTribology Series
ISSN (Print)0167-8922


Conference21st Leeds-Lyon Symposium on Tribology 1994
Country/TerritoryUnited Kingdom


  • IR-73218
  • METIS-145632

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