Publication result detail

Reducing the friction of lubricated nonconformal point contacts by transverse shallow micro-grooves

ALI, F.; KŘUPKA, I.; HARTL, M.

Original Title

Reducing the friction of lubricated nonconformal point contacts by transverse shallow micro-grooves

English Title

Reducing the friction of lubricated nonconformal point contacts by transverse shallow micro-grooves

Type

WoS Article

Original Abstract

This study focuses on the effects of transverse shallow micro-grooves on the film thickness and friction of nonconformal contacts under relative motion. Experiments were conducted using a ball-on-disc tribometer equipped with high speed camera and torque sensor. The lubricated contact between the steel ball and glass disc represents a nonconformal point contact with elastohydrodynamic lubrication. The measurements of the film thickness were carried out using the optical interferometry technique while the friction was measured by a torque sensor on the ball shaft. The results reveal that the rubbing surfaces with transverse shallow micro-grooves with a length less than the diameter of the Hertzian contact have an improved tribological performance in comparison with smooth surfaces in the elastohydrodynamic lubrication regime. Indeed, a significant enhancement of film thickness has been observed using such design of microgrooves.

English abstract

This study focuses on the effects of transverse shallow micro-grooves on the film thickness and friction of nonconformal contacts under relative motion. Experiments were conducted using a ball-on-disc tribometer equipped with high speed camera and torque sensor. The lubricated contact between the steel ball and glass disc represents a nonconformal point contact with elastohydrodynamic lubrication. The measurements of the film thickness were carried out using the optical interferometry technique while the friction was measured by a torque sensor on the ball shaft. The results reveal that the rubbing surfaces with transverse shallow micro-grooves with a length less than the diameter of the Hertzian contact have an improved tribological performance in comparison with smooth surfaces in the elastohydrodynamic lubrication regime. Indeed, a significant enhancement of film thickness has been observed using such design of microgrooves.

Keywords

Elastohydrodynamic lubrication; film thickness; friction; surface texturing; micro-grooves

Key words in English

Elastohydrodynamic lubrication; film thickness; friction; surface texturing; micro-grooves

Authors

ALI, F.; KŘUPKA, I.; HARTL, M.

RIV year

2016

Released

09.04.2015

Publisher

Sage

Location

UK

ISBN

1350-6501

Periodical

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

Volume

229

Number

4

State

United Kingdom of Great Britain and Northern Ireland

Pages from

420

Pages to

428

Pages count

9

BibTex

@article{BUT111249,
  author="Fadi {Ali} and Ivan {Křupka} and Martin {Hartl}",
  title="Reducing the friction of lubricated nonconformal point contacts by transverse shallow micro-grooves",
  journal="PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY",
  year="2015",
  volume="229",
  number="4",
  pages="420--428",
  doi="10.1177/1350650114543317",
  issn="1350-6501"
}