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Stress rupture of unidirectional polymer matrix composites in bending at elevated temperatures

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dc.contributor.authorMahieux, Celine Agnèsen
dc.contributor.committeechairReifsnider, Kenneth L.en
dc.contributor.committeememberKampe, Stephen L.en
dc.contributor.committeememberKander, Ronald G.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T21:48:41Zen
dc.date.adate2008-11-01en
dc.date.available2014-03-14T21:48:41Zen
dc.date.issued1996-12-05en
dc.date.rdate2008-11-01en
dc.date.sdate2008-11-01en
dc.description.abstractA new method for stress-rupture experiments in bending has been developed and used to characterize unidirectional polymer matrix composites. The method. which makes use of very simple fixtures, led to coherent results. These results have been modeled using the large deflection of buckled bars theory (elastica) and it is possible to predict with good accuracy the strain at each point of the specimen if the end-to-end distance is known. The failure process has been experimentally characterized. The formation and propagation of microbuckles leads to a compressive failure. Based on the elastica and the classical lamination theory, a model for the distribution of the Young's modulus along the length of the specimen has been established. Three different micromechanical models have been applied to analyze the time-to-failure versus strain behavior at two temperatures - one below and one above the glass transition. The first micromechanical model considers the nucleation of the microbuckles as the main cause of failure. In addition, the stiffness and stress distributions at any time before failure are calculated based upon the rotation of the fibers in the damaged region. The second and last models, respectively based upon a Paris Law and energy considerations relate the time-to-failure to the propagation of the main microbuckle. For this last model, a good correlation between experimental and theoretical data has been obtained. Finally the influence of the temperature on these models has been studied.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 83 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11012008-063348en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11012008-063348/en
dc.identifier.urihttp://hdl.handle.net/10919/45398en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.M345.pdfen
dc.relation.isformatofOCLC# 36801850en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectbendingen
dc.subjectstress ruptureen
dc.subjectcomposite materialsen
dc.subjectmicrobucklingen
dc.subject.lccLD5655.V855 1996.M345en
dc.titleStress rupture of unidirectional polymer matrix composites in bending at elevated temperaturesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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