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Wet Clutch Friction Interfaces under Water Contaminated Lubricant Conditions
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-3157-4632
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-8909-3554
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-9110-2819
2016 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 59, no 3, p. 441-450Article in journal (Refereed) Published
Abstract [en]

The performance of wet clutches used for automatic transmissions or other applications usually includes the desired positive friction characteristics and a shudder-free torque generation. Changes in the operating variables such as the lubricant conditions influence the formation of tribofilm, friction characteristics and can alter the degradation of the friction interfaces. In this work, the friction characteristics and degradation of the paper-steel friction interfaces were monitored when a commercial fully-formulated automatic transmission fluid (ATF) was contaminated with water. It was found that water in ATF influenced the clutch stability by increasing the mean coefficient of friction (µ) and the negative friction-velocity slope. Surface studies of the post-test friction interfaces clearly indicated reduced surface porosity and permeability, increased wettability and changed elemental composition on the contacting surfaces after tested with water- contaminated ATF. Moreover, water-contaminated paper-liners’ thermal decomposition shifted to a lower temperature compared to an uncontaminated liner during thermal analyses. These results displayed faster degradation and reduced service life of the clutch friction interfaces for water contamination. The resultant surface condition can be associated with the observed unstable friction and negative friction-velocity slopes.

Place, publisher, year, edition, pages
2016. Vol. 59, no 3, p. 441-450
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Bio Materials
Research subject
Machine Elements; Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-9929DOI: 10.1080/10402004.2015.1081998ISI: 000379702000007Scopus ID: 2-s2.0-84975521420Local ID: 8a320fba-e6e8-460d-be12-1c4d7252fe12OAI: oai:DiVA.org:ltu-9929DiVA, id: diva2:982868
Note

Validerad; 2016; Nivå 2; 20160408 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Fatima, NowshirMarklund, PärMathew, Aji P.Larsson, Roland

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