Publication detail

Effects of surface topography on lubrication film formation within elastohydrodynamic and mixed lubricated non-conformal contacts

KŘUPKA, I. HARTL, M. SVOBODA, P.

Original Title

Effects of surface topography on lubrication film formation within elastohydrodynamic and mixed lubricated non-conformal contacts

Type

journal article - other

Language

English

Original Abstract

This paper focuses on the effects of surface topography modifications on lubrication film thickness within non-conformal lubricated contact. Optical test rig is used to study the lubricant film behavior between the flat surface of a chromium coated glass disc and a steel ball. An array of micro-dents was produced on the ball surface to be able to demonstrate the effect of surface topography on lubrication film formation. Experiments were carried out under elastohydrodynamic and mixed lubrication using steady state and transient operational conditions (start up and reversal motion). Obtained results have shown that surface texturing could represent the way how to increase lubrication efficiency of rolling/sliding non-conformal contacts under operational conditions when lubrication film is not able separate rubbing surfaces. Lubricant emitted from the micro-dent helps to reduce the asperities interaction. Moreover, the effect of surface micro-cavities has been observed within starved non-conformal contact under pure rolling conditions. An increase in film thickness within severe starved contact was localized upstream micro-dents that was recently predicted numerically. This effect was further amplified as lubricant released from micro-dent remains on the ball surface and again enters the contact after the ball turns round.

Keywords

Surface texturing; Elastohydrodynamic lubrication; Mixed lubrication; Start-up; Starvation; Reversal motion; Film thickness

Authors

KŘUPKA, I.; HARTL, M.; SVOBODA, P.

RIV year

2009

Released

1. 5. 2009

Publisher

Professional Engineering Publishing

Location

Londýn

ISBN

1350-6501

Periodical

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY

Year of study

223

Number

6

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

9

Pages count

9

BibTex

@article{BUT47936,
  author="Ivan {Křupka} and Martin {Hartl} and Petr {Svoboda}",
  title="Effects of surface topography on lubrication film formation within elastohydrodynamic and mixed lubricated non-conformal contacts",
  journal="PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY",
  year="2009",
  volume="223",
  number="6",
  pages="1--9",
  issn="1350-6501"
}