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Evaluation of EHD films by electrical capacitance

journal contribution
posted on 2023-06-08, 14:01 authored by Karolina Anna Jablonka, Romeo GlovneaRomeo Glovnea, Jeroen Bongaerts
The elastohydrodynamic (EHD) lubrication regime occurs in many machine elements where a combination of hydrodynamic effect, elastic deformation of the loaded surfaces and increase of the viscosity of the lubricant with pressure ensure the formation of a very thin, but continuous film of lubricant separating the contacting surfaces. Electrical methods to determine this film’s thickness have preceded optical methods, which are widely used today. Although they generally give more qualitative thickness information, electrical methods have the main advantage that they can be applied to metallic contacts in machines, which makes them useful tools in the study of elastohydrodynamically lubricated contacts. The present paper is part of a larger study on the application of electrical capacitance for the evaluation of film formation in EHD contacts. The main focus is on the quantitative measurements of film thickness using electrical capacitance. A new approach allowing the lubricant film thickness to be extracted from the measured capacitance is developed using a chromium-coated glass disc and subsequently applied to a steel-on-steel contact. The results show good agreement with optical measurements and theoretical models over a range of film thickness.

History

Publication status

  • Published

File Version

  • Published version

Journal

Journal of Physics D: Applied Physics

ISSN

0022-3727

Publisher

Institute of Physics

Issue

38

Volume

45

Page range

385301-385309

Department affiliated with

  • Engineering and Design Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-11-30

First Compliant Deposit (FCD) Date

2012-11-30

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