Publication detail

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

ALI, F. KŘUPKA, I. HARTL, M.

Czech title

Snížení tření mazaných nekonformních bodových kontaktů pomocí příčných mělkých mikro-drážek

English title

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

Type

journal article in Web of Science

Language

en

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.

Czech abstract

Tato studie se zaměřuje na účinky příčných mělkých mikro-drážek na tloušťku filmu a tření nekonformních povrchů v relativním pohybu. Experimenty byly provedeny za použití tribometru vybaveného vysokorychlostní kamerou a snímačem točivého momentu. Mazaný kontakt mezi ocelovou kuličkou a skleněným kotoučem představuje nekonformní bodový kontakt elastohydrodynamicky mazaný. Výsledky ukazují, že třecí plochy s příčnými mělkými mikro-drážkami, jejichž délka je menší než je průměr Hertzova kontaktu, mají pozitivní vliv na mazný kontakt.

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 in Czech

Elastohydrodynamické mazání; tloušťka filmu; tření; modifikace topografie; mikro-drážky

Keywords in English

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

RIV year

2015

Released

09.04.2015

Publisher

Sage

Location

UK

ISSN

1350-6501

Volume

229

Number

4

Pages from–to

420–428

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",
  year="2015",
  volume="229",
  number="4",
  month="April",
  pages="420--428",
  publisher="Sage",
  address="UK",
  issn="1350-6501"
}