Detail publikace
Chování reálných povrchových nerovností v nekonformních kontaktech provozovaných za podmínek smíšeného mazání
KŘUPKA, I. HARTL, M. KOUTNÝ, D.
Český název
Chování reálných povrchových nerovností v nekonformních kontaktech provozovaných za podmínek smíšeného mazání
Anglický název
Behavior of real roughness features within mixed lubricated non-conformal contacts
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
A combination of thin film colorimetric interferometry and phase shifting interferometry was used to study the effect of slide-to-roll ratio on the micro-elastohydrodynamic action and asperity-contact mechanism on the real asperity scale. The behavior of the roughness features of different scales in very thin film, real rough surface elastohydrodynamic contacts was observed from chromatic interferograms evaluated by thin film colorimetric interferometry. Obtained film thickness distribution was compared with undeformed ball surface topography measured by phase shifting interferometry. It was confirmed that the presence of deep grooves within lubricated contact can result in lubrication film breakdown under positive slide-to-roll ratio conditions when the rough surface is moving slower than the smooth surface. Negative slide-to-roll ratio conditions are much less critical from this point of view. Moreover, shallow pits formed naturally on rubbing surface as a result of surface finishing process were observed to significantly influence the film thickness formation. They act as lubricant micro-reservoirs and emit the lubricant into the contact under rolling/sliding conditions that enlarges film thickness. Such a behavior also suggests the possible beneficial tribological effect of surface texturing based on shallow micro-cavities under mixed lubrication of non-conformal surfaces.
Český abstrakt
Článek shrnuje výsledky studia chování reálných povrchových nerovností v nekonformních kontaktech provozovaných za podmínek smíšeného mazání.
Anglický abstrakt
A combination of thin film colorimetric interferometry and phase shifting interferometry was used to study the effect of slide-to-roll ratio on the micro-elastohydrodynamic action and asperity-contact mechanism on the real asperity scale. The behavior of the roughness features of different scales in very thin film, real rough surface elastohydrodynamic contacts was observed from chromatic interferograms evaluated by thin film colorimetric interferometry. Obtained film thickness distribution was compared with undeformed ball surface topography measured by phase shifting interferometry. It was confirmed that the presence of deep grooves within lubricated contact can result in lubrication film breakdown under positive slide-to-roll ratio conditions when the rough surface is moving slower than the smooth surface. Negative slide-to-roll ratio conditions are much less critical from this point of view. Moreover, shallow pits formed naturally on rubbing surface as a result of surface finishing process were observed to significantly influence the film thickness formation. They act as lubricant micro-reservoirs and emit the lubricant into the contact under rolling/sliding conditions that enlarges film thickness. Such a behavior also suggests the possible beneficial tribological effect of surface texturing based on shallow micro-cavities under mixed lubrication of non-conformal surfaces.
Klíčová slova česky
Smíšené mazání; tloušťka mazacího filmu; drsné povrchy
Klíčová slova anglicky
Mixed lubrication; Film thickness; Rough surfaces; Interferometry
Rok RIV
2008
Vydáno
01.12.2008
Nakladatel
Elsevier
Místo
EU
ISSN
0301-679X
Časopis
Tribology International
Ročník
41
Číslo
12
Strany od–do
1153–1160
Počet stran
8
BIBTEX
@article{BUT47245,
author="Ivan {Křupka} and Martin {Hartl} and Daniel {Koutný},
title="Behavior of real roughness features within mixed lubricated non-conformal contacts",
journal="Tribology International",
year="2008",
volume="41",
number="12",
month="December",
pages="1153--1160",
publisher="Elsevier",
address="EU",
issn="0301-679X"
}