Publication detail

Influence of Contact Pressure on Central and Minimum Film Thickness Within Ultrathin Film Lubricated Contacts

KŘUPKA, I. HARTL, M. LIŠKA, M.

Czech title

Vliv kontantního tlaku na centrální a minimální tloušťku mazacího filmu u velmi tenkých mazacích filmů

English title

Influence of Contact Pressure on Central and Minimum Film Thickness Within Ultrathin Film Lubricated Contacts

Type

journal article - other

Language

en

Original abstract

Recent numerical results have indicated that the relationship between the film thickness and the speed may not always follow the simple power law, especially under severe conditions. This paper is aimed at obtaining experimental results at high contact stresses and low speeds to study the thin film behavior. Ultra-thin lubricant films were observed at maximum Hertz pressures of 0.52, 1.01 and 1.54 GPa by using an optical test rig. Central and minimum film thickness values were obtained with thin film colorimetric interferometry from chromatic interferograms. The non-linear behavior of both central and minimum film thicknesses in log-log coordinates was observed as rolling speed and thereby film thickness decreased. This tendency became more obvious at higher contact pressures.

Czech abstract

Článek shrnuje výsledky získané při studiu velmi tenkých mazacích filmů za vysokých kontaktních tlaků. Tloušťka mazacího filmu byla stanovována kolorimetrickou interferometrií pro hodnoty maximálního Hertzova tlaku 0.52, 1.01 and 1.54 GPa. Bylo zjištěno, že za těchto podmínek dochází k odchylce od lineární závislosti (v logaritmických souřadnicích) tloušťky mazacího filmu na rychlosti valení.

English abstract

Recent numerical results have indicated that the relationship between the film thickness and the speed may not always follow the simple power law, especially under severe conditions. This paper is aimed at obtaining experimental results at high contact stresses and low speeds to study the thin film behavior. Ultra-thin lubricant films were observed at maximum Hertz pressures of 0.52, 1.01 and 1.54 GPa by using an optical test rig. Central and minimum film thickness values were obtained with thin film colorimetric interferometry from chromatic interferograms. The non-linear behavior of both central and minimum film thicknesses in log-log coordinates was observed as rolling speed and thereby film thickness decreased. This tendency became more obvious at higher contact pressures.

Keywords in English

lubrication, high pressure, film thickness

RIV year

2005

Released

01.07.2005

ISSN

0742-4787

Journal

ASME Transaction, Journal of Tribology

Volume

127

Number

4

Pages count

3

BIBTEX


@article{BUT42820,
  author="Ivan {Křupka} and Martin {Hartl} and Miroslav {Liška},
  title="Influence of Contact Pressure on Central and Minimum Film Thickness Within Ultrathin Film Lubricated Contacts",
  journal="ASME Transaction, Journal of Tribology",
  year="2005",
  volume="127",
  number="4",
  month="July",
  issn="0742-4787"
}