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

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Version 2 2023-06-12, 07:24
Version 1 2023-06-09, 14:38
journal contribution
posted on 2023-06-12, 07:24 authored by Romeo GlovneaRomeo Glovnea, Xingnan Zhang
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Tribology Letters

ISSN

1023-8883

Publisher

Springer Verlag

Issue

116

Volume

66

Page range

1-11

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Dynamics, Control and Vehicle Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-10-30

First Open Access (FOA) Date

2018-10-30

First Compliant Deposit (FCD) Date

2018-08-17

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