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"
}