On the relevance of analytical film thickness EHD equations for isothermal point contacts: Qualitative or quantitative predictions?

Jean-David WHEELER; Philippe VERGNE; Nicolas FILLOT; David PHILIPPON

doi:10.1007/s40544-016-0133-7

Friction 2016, 4(4): 369-379 https://doi.org/10.1007/s40544-016-0133-7

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Open Access | Issue | Published: 23 December 2016

On the relevance of analytical film thickness EHD equations for isothermal point contacts: Qualitative or quantitative predictions?

Show Author's Information Hide Author's Information Jean-David WHEELER, Philippe VERGNE(

), Nicolas FILLOT, David PHILIPPON

Univ Lyon, INSA Lyon, CNRS, LaMCoS-UMR5259, Villeurbanne F-69621, France

Keywords:

elastohydrodynamic lubrication (EHL), thin film lubrication, film thickness prediction, EHD analytical equation, central film thickness, minimum film thickness, circular contacts, elliptical contacts

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WHEELER J-D, VERGNE P, FILLOT N, et al. On the relevance of analytical film thickness EHD equations for isothermal point contacts: Qualitative or quantitative predictions?. Friction, 2016, 4(4): 369-379. https://doi.org/10.1007/s40544-016-0133-7

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Abstract

Thin film and elastohydrodynamic lubrication regimes are rather young domains of tribology and they are still facing unresolved issues. As they rely upon a full separation of the moving surfaces by a thin (or very thin) fluid film, the knowledge of its thickness is of paramount importance, as for instance to developing lubricated mechanisms with long lasting and efficient designs. As a consequence, a large collection of formulae for point contacts have been proposed in the last 40 years. However, their accuracy and validity have rarely been investigated. The purpose of this paper is to offer an evaluation of the most widespread analytical formulae and to define whether they can be used as qualitative or quantitative predictions. The methodology is based on comparisons with a numerical model for two configurations, circular and elliptical, considering both central and minimum film thicknesses.

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On the relevance of analytical film thickness EHD equations for isothermal point contacts: Qualitative or quantitative predictions?

Show Author's information Hide Author's Information Jean-David WHEELER, Philippe VERGNE(

), Nicolas FILLOT, David PHILIPPON

Univ Lyon, INSA Lyon, CNRS, LaMCoS-UMR5259, Villeurbanne F-69621, France

Abstract

Keywords: elastohydrodynamic lubrication (EHL), thin film lubrication, film thickness prediction, EHD analytical equation, central film thickness, minimum film thickness, circular contacts, elliptical contacts

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Publication history

Received: 04 November 2016

Revised: 19 November 2016

Accepted: 20 November 2016

Published: 23 December 2016

Issue date: June 2021

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Acknowledgements

This work was partly financed by SKF in the framework of the global program “Advanced Bearing Lubrication”.

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