Publication detail
Experimental Study of Microtextured Surfaces Operating Under Thin-Film EHD Lubrication Conditions
KŘUPKA, I. HARTL, M.
Czech title
Experimentální studium povrchů s cílenou modifikací topografie provozovaných za podmínek EHD mazání
English title
Experimental Study of Microtextured Surfaces Operating Under Thin-Film EHD Lubrication Conditions
Type
journal article - other
Language
en
Original abstract
The effect of microdents within thin elastohydrodynamics (EHD) contacts has been studied by two measurement techniques. Phase-shifting interferometry was used to obtain topography of microtextured surface and thin-film colorimetric interferometry provided detailed information about film thickness changes within a lubricated contact. The behavior of microdents has been observed for positive slide-to-roll ratios when the disk is moving faster than the microtextured ball. The depth of microdents has been found to play significant role as to the lubrication films efficiency. The presence of deep microdents within lubricated contact results in film thickness reduction downstream that can even cause lubrication film breakdown. As the depth of microdents is reduced, this effect diminishes and beneficial effect of microdents on film thickness formation has been observed. No such an effect of microdent depth on lubricant film shape has been observed in case of negative slide-to-roll conditions when microdents do not cause film thickness reduction regardless of their depths. Obtained results suggest that surface texturing using microdents of an appropriate depth could help to increase lubrication films capabilities.
Czech abstract
V článku jsou shrnuty výsledky úvodní etapy experimentálního studia povrchů s cílenou modifikací topografie provozovaných za podmínek EHD mazání. Je zde ukázán vliv hloubky mikro-důlků a provozních podmínek na utváření mazacího filmu.
English abstract
The effect of microdents within thin elastohydrodynamics (EHD) contacts has been studied by two measurement techniques. Phase-shifting interferometry was used to obtain topography of microtextured surface and thin-film colorimetric interferometry provided detailed information about film thickness changes within a lubricated contact. The behavior of microdents has been observed for positive slide-to-roll ratios when the disk is moving faster than the microtextured ball. The depth of microdents has been found to play significant role as to the lubrication films efficiency. The presence of deep microdents within lubricated contact results in film thickness reduction downstream that can even cause lubrication film breakdown. As the depth of microdents is reduced, this effect diminishes and beneficial effect of microdents on film thickness formation has been observed. No such an effect of microdent depth on lubricant film shape has been observed in case of negative slide-to-roll conditions when microdents do not cause film thickness reduction regardless of their depths. Obtained results suggest that surface texturing using microdents of an appropriate depth could help to increase lubrication films capabilities.
Keywords in Czech
modifikace topografie; tloušťka mazacího filmu; kolorimetrická interferometrie
Keywords in English
surface texturing; film thickness; colorimetric interferometry
RIV year
2007
Released
01.07.2007
Publisher
ASME Technical Publications
Location
USA
ISSN
0742-4787
Journal
ASME Transaction, Journal of Tribology
Volume
129
Number
3
Pages from–to
502–508
Pages count
7
BIBTEX
@article{BUT43856,
author="Ivan {Křupka} and Martin {Hartl},
title="Experimental Study of Microtextured Surfaces Operating Under Thin-Film EHD Lubrication Conditions",
journal="ASME Transaction, Journal of Tribology",
year="2007",
volume="129",
number="3",
month="July",
pages="502--508",
publisher="ASME Technical Publications",
address="USA",
issn="0742-4787"
}