Publication detail

Effect of surface roughness on lubricant film breakdown and transition from EHL to mixed lubrication

KŘUPKA, I. ŠPERKA, P. HARTL, M.

Original Title

Effect of surface roughness on lubricant film breakdown and transition from EHL to mixed lubrication

Type

journal article in Web of Science

Language

English

Original Abstract

The ability of elastohydrodynamically lubricated (EHL) contacts to separate surfaces represents essential design requirement ensuring long life and low friction of machine components. Nevertheless, it is strongly affected by surface roughness that tends to decrease formed lubricant film. Surface roughness related effects are highly scales dependent. Dimensions in longitudinal and transverse directions influence roughness deformation while dimensions in roughness height can have significant effects on lubrication process. The prediction of the roughness features effect on lubricant film in the case of possible lubricant film breakdown still represents the challenge even for nowadays power full numerical simulation tools. At the same time some simple measures as the lambda ratio does not provides realistic estimation of lubrication regimes. However, there is a strong demand for such a prediction especially close to the transition to the mixed lubrication regime. In this paper possible approach based on the combination of experimental and numerical data is discussed. It is suggested that quantified experimental data could bridge possible gaps in the ability of the theory to provide the sufficient fast estimation of lubrication capabilities of engineering surfaces in the transition region between EHL and mixed lubrication.

Keywords

EHL; Mixed lubrication; Surface roughness; Film thickness

Authors

KŘUPKA, I.; ŠPERKA, P.; HARTL, M.

Released

31. 8. 2016

Publisher

Elsevier

ISBN

0301-679X

Periodical

Tribology International

Year of study

100

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

116

Pages to

125

Pages count

10

URL

http://www.sciencedirect.com/science/article/pii/S0301679X15005769

BibTex

@article{BUT134839,
  author="Ivan {Křupka} and Petr {Šperka} and Martin {Hartl}",
  title="Effect of surface roughness on lubricant film breakdown and transition from EHL to mixed lubrication",
  journal="Tribology International",
  year="2016",
  volume="100",
  number="1",
  pages="116--125",
  doi="10.1016/j.triboint.2015.12.008",
  issn="0301-679X",
  url="http://www.sciencedirect.com/science/article/pii/S0301679X15005769"
}