Evaluation of EHD films by electrical capacitance

Jablonka, Karolina Anna, Glovnea, Romeo and Bongaerts, Jeroen (2012) Evaluation of EHD films by electrical capacitance. Journal of Physics D: Applied Physics, 45 (38). pp. 385301-385309. ISSN 0022-3727

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Abstract

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.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ0170 Mechanics applied to machinery. Dynamics
Depositing User: Romeo Glovnea
Date Deposited: 30 Nov 2012 12:46
Last Modified: 07 Mar 2017 04:57
URI: http://sro.sussex.ac.uk/id/eprint/43202

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