A homogenized micro-elastohydrodynamic lubrication model: Accounting for non-negligible microscopic quantities

In rough elastohydrodynamic lubricated contacts the geometry often exhibits two clearly separated scales: a macroscopic scale –the one of the bearing– and a microscopic scale, that of the surface roughness. In numerical simulation of lubricated contacts, this difference in scales leads to large syst...

Full description

Saved in:
Bibliographic Details
Published in:Tribology international 2019-07, Vol.135, p.344-354
Main Authors: Checo, Hugo M., Dureisseix, David, Fillot, Nicolas, Raisin, Jonathan
Format: Article
Language:English
Subjects:
Asymptotic properties
Computer simulation
Deformation
Elastohydrodynamic lubrication
Homogenization
Lubrication
Mathematical models
Mechanics
Microelastohydrodynamic
Periodic variations
Physics
Roughness
Structural mechanics
Surface roughness
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In rough elastohydrodynamic lubricated contacts the geometry often exhibits two clearly separated scales: a macroscopic scale –the one of the bearing– and a microscopic scale, that of the surface roughness. In numerical simulation of lubricated contacts, this difference in scales leads to large systems of equations to solve. Assuming periodicity or pseudo-periodicity of the small scale, several methods to decouple the macro scale from the micro scale have been proposed, the formal approach being the homogenization theory. However, the approximation errors due to the classical asymptotic assumptions can be considerable. In this work we introduce a homogenized model which takes into account the non-negligible pressures and deformations of the micro scale, thus extending the applicability of the classical asymptotic homogenized approaches. •A homogenized model for micro-elastohydrodynamic contacts.•Model takes into account piezoviscous and density effects.•The model takes into account non-negligible microscopic effects.•Parametric studies show errors in pressure and clearance below 5%.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2019.01.022