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dc.contributor.authorTiwari, Avinash
dc.contributor.authorMiyashita, N
dc.contributor.authorEspallargas, Nuria
dc.contributor.authorPersson, Bo N.J.
dc.date.accessioned2019-02-18T09:43:33Z
dc.date.available2019-02-18T09:43:33Z
dc.date.created2018-11-14T14:00:48Z
dc.date.issued2018
dc.identifier.citationJournal of Chemical Physics. 2018, 148 (22), .nb_NO
dc.identifier.issn0021-9606
dc.identifier.urihttp://hdl.handle.net/11250/2585866
dc.description.abstractThere are two contributions to the friction force when a rubber block is sliding on a hard and rough substrate surface, namely, a contribution Fad = τf A from the area of real contact A and a viscoelastic contribution Fvisc from the pulsating forces exerted by the substrate asperities on the rubber block. Here we present experimental results obtained at different sliding speeds and temperatures, and we show that the temperature dependency of the shear stress τf, for temperatures above the rubber glass transition temperature Tg, is weaker than that of the bulk viscoelastic modulus. The physical origin of τf for T > Tg is discussed, and we propose that its temperature dependency is determined by the rubber molecule segment mobility at the sliding interface, which is higher than in the bulk because of increased free-volume effect due to the short-wavelength surface roughness. This is consistent with the often observed reduction in the glass transition temperature in nanometer-thick surface layers of glassy polymers. For temperatures T < Tg, the shear stress τf is nearly velocity independent and of similar magnitude as observed for glassy polymers such as PMMA or polyethylene. In this case, the rubber undergoes plastic deformations in the asperity contact regions and the contact area is determined by the rubber penetration hardness. For this case, we propose that the frictional shear stress is due to slip at the interface between the rubber and a transfer film adsorbed on the concrete surface.nb_NO
dc.language.isoengnb_NO
dc.publisherAIP Publishingnb_NO
dc.titleRubber friction: The contribution from the area of real contactnb_NO
dc.title.alternativeRubber friction: The contribution from the area of real contactnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber20nb_NO
dc.source.volume148nb_NO
dc.source.journalJournal of Chemical Physicsnb_NO
dc.source.issue22nb_NO
dc.identifier.doi10.1063/1.5037136
dc.identifier.cristin1630545
dc.relation.projectNorges forskningsråd: 234115nb_NO
dc.description.localcodeLocked until 12.6.2019 due to copyright restrictions.Published by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Journal of Chemical Physics and may be found at https://doi.org/10.1063/1.5037136nb_NO
cristin.unitcode194,64,92,0
cristin.unitnameInstitutt for maskinteknikk og produksjon
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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