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Effects of fiber type on the tribological behavior of polyamide composites

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dc.contributor.authorWeick, Brian L.en
dc.contributor.committeechairFurey, Michael J.en
dc.contributor.committeememberEiss, Norman S.en
dc.contributor.committeememberHirschfeld, Deirdre A.en
dc.contributor.committeememberMcGrath, James E.en
dc.contributor.committeememberRogers, Craig A.en
dc.contributor.departmentMaterials Engineering Scienceen
dc.date.accessioned2014-03-14T21:21:36Zen
dc.date.adate2006-10-19en
dc.date.available2014-03-14T21:21:36Zen
dc.date.issued1993en
dc.date.rdate2006-10-19en
dc.date.sdate2006-10-19en
dc.description.abstractAn experimental and analytical study of the tribological behavior of polymer composites is presented. Glass, aramid, and carbon fiber-filled polyamide (Nylon 6,6) composites serve as models for understanding friction and wear processes encountered when polymer composites are used in tribological applications. Experimental results not only include measurements of friction and wear, but surface temperatures produced by frictional processes during oscillating contact experiments. Since an optically flat, transparent sapphire disk is used as the oscillating countersurface, surface temperatures can be measured directly at the interface using an infrared microscope. Experimental results show that the presence of fibers in the polyamide matrix lowers wear, friction, and surface temperature when compared with the unfilled polymer. Rationale for this improved tribological behavior is presented and discussed. Fiber-type is shown to have a direct influence on the tribological behavior of the polymer composite, and the chemical behavior at and near the interface is shown to be significant by examining worn and transferred material through surface analytical techniques. In particular, evidence is presented for the tribochemical degradation of intramolecular bonds in the polyamide macromolecule. Measurements of surface temperatures are compared with theoretical predictions using models for the real area(s) of contact, and results from “scanning” experiments are also presented in which the infrared microscope is used to measure surface temperatures at possible real areas of contact within the apparent contact region. Instantaneous measurements of surface temperature and friction over a single cycle of motion are also presented which allows for the performance of a frequency domain analysis. This technique not only shows the frequency content of the friction and surface temperature signals, but it also shows correlations between these two parameters. The role of intermolecular attractions in frictional processes is addressed, and evidence for relatively strong intermolecular attractions between the polyamide surface and sapphire disk is discussed.en
dc.description.degreePh. D.en
dc.format.extentxx, 400 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10192006-115602en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10192006-115602/en
dc.identifier.urihttp://hdl.handle.net/10919/39994en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1993.W442.pdfen
dc.relation.isformatofOCLC# 29699901en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1993.W442en
dc.subject.lcshFibrous composites -- Mechanical propertiesen
dc.subject.lcshFrictionen
dc.subject.lcshPolyamides -- Mechanical propertiesen
dc.subject.lcshTribologyen
dc.titleEffects of fiber type on the tribological behavior of polyamide compositesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Engineering Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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