Publication detail

Behavior of real roughness features within mixed lubricated non-conformal contacts

KŘUPKA, I. HARTL, M. KOUTNÝ, D.

Original Title

Behavior of real roughness features within mixed lubricated non-conformal contacts

Type

journal article - other

Language

English

Original Abstract

A combination of thin film colorimetric interferometry and phase shifting interferometry was used to study the effect of slide-to-roll ratio on the micro-elastohydrodynamic action and asperity-contact mechanism on the real asperity scale. The behavior of the roughness features of different scales in very thin film, real rough surface elastohydrodynamic contacts was observed from chromatic interferograms evaluated by thin film colorimetric interferometry. Obtained film thickness distribution was compared with undeformed ball surface topography measured by phase shifting interferometry. It was confirmed that the presence of deep grooves within lubricated contact can result in lubrication film breakdown under positive slide-to-roll ratio conditions when the rough surface is moving slower than the smooth surface. Negative slide-to-roll ratio conditions are much less critical from this point of view. Moreover, shallow pits formed naturally on rubbing surface as a result of surface finishing process were observed to significantly influence the film thickness formation. They act as lubricant micro-reservoirs and emit the lubricant into the contact under rolling/sliding conditions that enlarges film thickness. Such a behavior also suggests the possible beneficial tribological effect of surface texturing based on shallow micro-cavities under mixed lubrication of non-conformal surfaces.

Keywords

Mixed lubrication; Film thickness; Rough surfaces; Interferometry

Authors

KŘUPKA, I.; HARTL, M.; KOUTNÝ, D.

RIV year

2008

Released

1. 12. 2008

Publisher

Elsevier

Location

EU

ISBN

0301-679X

Periodical

Tribology International

Year of study

41

Number

12

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1153

Pages to

1160

Pages count

8

BibTex

@article{BUT47245,
  author="Ivan {Křupka} and Martin {Hartl} and Daniel {Koutný}",
  title="Behavior of real roughness features within mixed lubricated non-conformal contacts",
  journal="Tribology International",
  year="2008",
  volume="41",
  number="12",
  pages="1153--1160",
  issn="0301-679X"
}