Detail publikace
Vliv balotinování na kontakní únavové porušování a tloušťku mazacího filmu nekonformních třecích povrchů za podmínek smíšeného mazání a skluzu
VRBKA, M. KŘUPKA, I. SVOBODA, P. ŠPERKA, P. NÁVRAT, T. HARTL, M. NOHAVA, J.
Český název
Vliv balotinování na kontakní únavové porušování a tloušťku mazacího filmu nekonformních třecích povrchů za podmínek smíšeného mazání a skluzu
Anglický název
Effect of shot peening on rolling contact fatigue and lubricant film thickness within mixed lubricated non-conformal rolling/sliding contacts
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
The effect of shot peening on rolling contact fatigue (RCF) and lubricant film thickness within nonconformal rolling/sliding contacts operated under mixed lubrication conditions was observed in this study. Rolling contact fatigue tests and film thickness measurements were carried out using specimens with modified surface topography by shot peening process using glass beads having diameter between 0.07 and 0.11 mm. It has been shown that the effect of shot peening on RCF has no positive effect even if shot peened surface of the roller exhibited somewhat higher hardness in contrast to the grounded surface. The reduction of RCF may be caused due to asperities interactions because after shot peening the surface roughness of the roller was increased. Film thickness measurements confirmed that the contact is realized actually only between asperity peaks of shot peened ball and smooth disc. Conversely, no negative effect on RCF was observed when the shot peened surface of the roller was polished. The polish of asperity peaks causes the creation of lands and micro-cavities, which may be employed as lubricant micro-reservoirs. From film thickness measurements it has been observed that lubricant emitted by shallow micro-cavities can provide the local increase in lubrication film thickness, which thereby reduces asperities interactions. Similar results were obtained for start-up conditions where the squeeze lubricant enlarges film thickness and reduces surface interactions. From the obtained results, it can be suggested that properly designed surface topography modification could help to increase the efficiency of lubrication films leading to the enhancement of contact fatigue life of non-conformal mixed lubricated rolling/sliding contacts.
Český abstrakt
Článek se zabývá vlivem balotinování na kontakní únavové porušování a tloušťku mazacího filmu nekonformních třecích povrchů za podmínek smíšeného mazání a skluzu. Bylo prokázáno, že pokud je povrch pouze balotinován tak kontaktní únavové porušení nastává dříve než u broušeného povrchu. Je-li balotinovaný povrch přeleštěn, tak dojde k zahlazení výstupků nerovností a navýšení kontaktní únavové životnosti.
Anglický abstrakt
The effect of shot peening on rolling contact fatigue (RCF) and lubricant film thickness within nonconformal rolling/sliding contacts operated under mixed lubrication conditions was observed in this study. Rolling contact fatigue tests and film thickness measurements were carried out using specimens with modified surface topography by shot peening process using glass beads having diameter between 0.07 and 0.11 mm. It has been shown that the effect of shot peening on RCF has no positive effect even if shot peened surface of the roller exhibited somewhat higher hardness in contrast to the grounded surface. The reduction of RCF may be caused due to asperities interactions because after shot peening the surface roughness of the roller was increased. Film thickness measurements confirmed that the contact is realized actually only between asperity peaks of shot peened ball and smooth disc. Conversely, no negative effect on RCF was observed when the shot peened surface of the roller was polished. The polish of asperity peaks causes the creation of lands and micro-cavities, which may be employed as lubricant micro-reservoirs. From film thickness measurements it has been observed that lubricant emitted by shallow micro-cavities can provide the local increase in lubrication film thickness, which thereby reduces asperities interactions. Similar results were obtained for start-up conditions where the squeeze lubricant enlarges film thickness and reduces surface interactions. From the obtained results, it can be suggested that properly designed surface topography modification could help to increase the efficiency of lubrication films leading to the enhancement of contact fatigue life of non-conformal mixed lubricated rolling/sliding contacts.
Klíčová slova česky
modifikace topografie, třecí povrch, balotinování, kontaktní únava, tloušťka mazacího filmu
Klíčová slova anglicky
Surface topography modification, Shot peening, Rolling contact fatigue (RCF), Film thickness
Rok RIV
2011
Vydáno
25.06.2011
Nakladatel
Elsevier
Místo
Nizozemí
ISSN
0301-679X
Ročník
44
Číslo
12
Strany od–do
1726–1735
Počet stran
10
BIBTEX
@article{BUT74463,
author="Martin {Vrbka} and Ivan {Křupka} and Petr {Svoboda} and Petr {Šperka} and Tomáš {Návrat} and Martin {Hartl},
title="Effect of shot peening on rolling contact fatigue and lubricant film thickness within mixed lubricated non-conformal rolling/sliding contacts",
year="2011",
volume="44",
number="12",
month="June",
pages="1726--1735",
publisher="Elsevier",
address="Nizozemí",
issn="0301-679X"
}