Elastohydrodynamic films under periodic load variation: an experimental and theoretical approach

Glovnea, Romeo and Zhang, Xingnan (2018) Elastohydrodynamic films under periodic load variation: an experimental and theoretical approach. Tribology Letters, 66 (116). pp. 1-11. ISSN 1023-8883

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The elastohydrodynamic lubrication regime occurs in systems where large elastic deformations, the hydrodynamic action of a converging wedge and eventually large variation of viscosity of the fluid concur to determine the formation of a continuous fluid film that separates the solid surfaces. Experimental and theoretical work, over the past few decades, have elucidated the role of various working and material parameters on the lubricant film thickness which plays a crucial role in protecting the solid surfaces from direct contact and ultimately from failure. These mechanisms are well understood for steady state conditions however, elastohydrodynamic contacts most often experience transient conditions, including variation of geometry, velocity of surfaces or load. In this case the mechanisms of film formation are more complex involving film squeeze in addition to the mechanisms mentioned above. Experimental and theoretical modelling of transient phenomena in elastohydrodynamic lubrication include sudden variation of entrainment speed or load and changing geometry. No systematic experimental study on the effect of harmonic load vibration upon the elastohydrodynamic films has been published before. In order to cover this gap this paper presents the results of an experimental study and of a simple theoretical approach on the behaviour of the elastohydrodynamic film thickness under harmonic variation of load.

Item Type: Article
Keywords: elastohydrodynamic, film thickness, vibrations, harmonic force
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ0170 Mechanics applied to machinery. Dynamics
Depositing User: Romeo Glovnea
Date Deposited: 30 Oct 2018 09:35
Last Modified: 30 Oct 2018 10:01
URI: http://srodev.sussex.ac.uk/id/eprint/77965

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