On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel

Influence of the moist air humidity (10-70%) on the fretting characteristics of steels under grease lubrication is experimentally investigated. Ball (bearing steel, JIS SUJ2) on disk (carbon steel, JIS S15C) type fretting tests for 0-20 mg of grease supplied before each test at the punctual contact...

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Autores principales:	Claudiu Valentin Suciu, Tohru Uchida, Hozumi Goto
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2013
Materias:	tribology fretting wear grease lubrication moist air material testing steel Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/641f40c7e619430fa669d9f2287ab9d9
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spelling	oai:doaj.org-article:641f40c7e619430fa669d9f2287ab9d92021-11-05T09:24:31ZOn the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel1881-219810.2474/trol.8.28https://doaj.org/article/641f40c7e619430fa669d9f2287ab9d92013-01-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/8/1/8_28/_pdf/-char/enhttps://doaj.org/toc/1881-2198Influence of the moist air humidity (10-70%) on the fretting characteristics of steels under grease lubrication is experimentally investigated. Ball (bearing steel, JIS SUJ2) on disk (carbon steel, JIS S15C) type fretting tests for 0-20 mg of grease supplied before each test at the punctual contact between ball and disk were conducted at 50 μm slip amplitude and 6.7 Hz frequency. From the shape of the friction hysteresis one calculates the slip index, and based on it, determines the type of fretting regime against the number of fretting cycles. Influence of the grease amount and relative humidity on the friction coefficient, slip index and wear rate is interpreted based on the occurrence of the grease film breakdown. Fretting wear rate appears as unaffected by variation of the environmental humidity for an amount of grease exceeding 3 mg, this representing the minimum amount necessary to avoid the grease film breakdown. Results obtained are useful to find the amount of grease necessary but sufficient for proper lubrication, and hence to protect the environment by grease saving. In order to generalize the results obtained for ball- bearings, screws, joints, guide-ways, etc., a tribological analysis based on the Stribeck curve was performed and then, the amount of grease necessary but sufficient to obtain fully lubricated fretting regime in moist air for ball bearings was discussed in detail.Claudiu Valentin SuciuTohru UchidaHozumi GotoJapanese Society of Tribologistsarticletribologyfrettingweargrease lubricationmoist airmaterial testingsteelPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 8, Iss 1, Pp 28-37 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	tribology fretting wear grease lubrication moist air material testing steel Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	tribology fretting wear grease lubrication moist air material testing steel Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Claudiu Valentin Suciu Tohru Uchida Hozumi Goto On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel
description	Influence of the moist air humidity (10-70%) on the fretting characteristics of steels under grease lubrication is experimentally investigated. Ball (bearing steel, JIS SUJ2) on disk (carbon steel, JIS S15C) type fretting tests for 0-20 mg of grease supplied before each test at the punctual contact between ball and disk were conducted at 50 μm slip amplitude and 6.7 Hz frequency. From the shape of the friction hysteresis one calculates the slip index, and based on it, determines the type of fretting regime against the number of fretting cycles. Influence of the grease amount and relative humidity on the friction coefficient, slip index and wear rate is interpreted based on the occurrence of the grease film breakdown. Fretting wear rate appears as unaffected by variation of the environmental humidity for an amount of grease exceeding 3 mg, this representing the minimum amount necessary to avoid the grease film breakdown. Results obtained are useful to find the amount of grease necessary but sufficient for proper lubrication, and hence to protect the environment by grease saving. In order to generalize the results obtained for ball- bearings, screws, joints, guide-ways, etc., a tribological analysis based on the Stribeck curve was performed and then, the amount of grease necessary but sufficient to obtain fully lubricated fretting regime in moist air for ball bearings was discussed in detail.
format	article
author	Claudiu Valentin Suciu Tohru Uchida Hozumi Goto
author_facet	Claudiu Valentin Suciu Tohru Uchida Hozumi Goto
author_sort	Claudiu Valentin Suciu
title	On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel
title_short	On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel
title_full	On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel
title_fullStr	On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel
title_full_unstemmed	On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel
title_sort	on the necessary but sufficient amount of grease to obtain fully lubricated fretting regime in moist air for suj2 bearing steel against s15c carbon steel
publisher	Japanese Society of Tribologists
publishDate	2013
url	https://doaj.org/article/641f40c7e619430fa669d9f2287ab9d9
work_keys_str_mv	AT claudiuvalentinsuciu onthenecessarybutsufficientamountofgreasetoobtainfullylubricatedfrettingregimeinmoistairforsuj2bearingsteelagainsts15ccarbonsteel AT tohruuchida onthenecessarybutsufficientamountofgreasetoobtainfullylubricatedfrettingregimeinmoistairforsuj2bearingsteelagainsts15ccarbonsteel AT hozumigoto onthenecessarybutsufficientamountofgreasetoobtainfullylubricatedfrettingregimeinmoistairforsuj2bearingsteelagainsts15ccarbonsteel
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On the Necessary but Sufficient Amount of Grease to Obtain Fully Lubricated Fretting Regime in Moist Air for SUJ2 Bearing Steel against S15C Carbon Steel

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