Thickener Behaviour in Rolling Elastohydrodynamic Lubrication Contacts

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dc.contributor.authorOkál, Michalcs
dc.contributor.authorKošťál, Davidcs
dc.contributor.authorSakai, Kazumics
dc.contributor.authorKřupka, Ivancs
dc.contributor.authorHartl, Martincs
dc.coverage.issue3cs
dc.coverage.volume72cs
dc.date.accessioned2024-10-14T09:03:57Z
dc.date.available2024-10-14T09:03:57Z
dc.date.issued2024-06-04cs
dc.description.abstractThis paper focuses on the study of thickener behaviour in elastohydrodynamic contacts using fluorescence microscopy and optical interferometry. A standard Ball-on-disc configuration tribometer was used as well as a newly developed Ball-on-ring configuration tribometer mimicking the conditions in a 6314 deep groove ball bearing. Three types of custom-made greases were used with the same base oil and Coumarin 6 fluorescent dye on the thickener. These greases contained no additives and were of the lithium complex and alicyclic di-urea type. It was confirmed that the behaviour of the grease was directly influenced by both the structure and type of thickener, and the differences were successfully observed by fluorescence microscopy. The concentration of thickener was found to change due to the formation or breakdown of the deposited thickener layer on the track. At low speeds, the alicyclic di-urea forms a thickener layer on the track that is more pronounced than the lubricating film formed by the base oil alone. The thickener layer formation also occurs at higher speeds when fully flooded conditions are beneficial in building the layer. Experiments with a Ball-on-ring tribometer show that the natural replenishment of the real contact geometry is more effective than on a Ball-on-disc tribometer, but the formation of the thickener layer on the track is more limited than in a Ball-on-disc tribometer with artificial replenishment. At higher velocities, a smaller but stable layer is formed where the layer does not change much from a certain velocity.en
dc.formattextcs
dc.format.extent1-16cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationTribology Letters. 2024, vol. 72, issue 3, p. 1-16.en
dc.identifier.doi10.1007/s11249-024-01874-0cs
dc.identifier.issn1573-2711cs
dc.identifier.orcid0000-0002-4833-6588cs
dc.identifier.orcid0000-0003-1351-9373cs
dc.identifier.orcid0000-0002-9936-7480cs
dc.identifier.orcid0000-0001-5432-6645cs
dc.identifier.other188837cs
dc.identifier.researcheridF-6941-2012cs
dc.identifier.researcheridD-8147-2012cs
dc.identifier.researcheridD-8261-2012cs
dc.identifier.scopus55826337100cs
dc.identifier.scopus7005196946cs
dc.identifier.urihttps://hdl.handle.net/11012/249516
dc.language.isoencs
dc.publisherSPRINGER/PLENUM PUBLISHERScs
dc.relationOperační program Jan Amos Komenský
dc.relation.ispartofTribology Letterscs
dc.relation.projectIdCZ.02.01.01/00/22_008/0004634
dc.relation.urihttps://link.springer.com/article/10.1007/s11249-024-01874-0cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1573-2711/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectEHDen
dc.subjectGreaseen
dc.subjectThickeneren
dc.subjectBall bearingen
dc.subjectFluorescenceen
dc.subjectFilm thicknessen
dc.titleThickener Behaviour in Rolling Elastohydrodynamic Lubrication Contactsen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
project.funder.nameMŠMT
sync.item.dbidVAV-188837en
sync.item.dbtypeVAVen
sync.item.insts2024.10.14 11:03:57en
sync.item.modts2024.09.19 11:32:05en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav konstruovánícs
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