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dc.contributor.authorCain, Jason Jamesen_US
dc.date.accessioned2014-03-14T20:09:58Z
dc.date.available2014-03-14T20:09:58Z
dc.date.issued2008-04-04en_US
dc.identifier.otheretd-04182008-023917en_US
dc.identifier.urihttp://hdl.handle.net/10919/26973
dc.description.abstractThis dissertation discusses topics related to the performance and long-term durability of glass-reinforced composites. The first portion of this dissertation describes work to assess the effect that post-curing has on widely used E-glass/vinyl-ester composites (E-glass/Derakane 510-A and E-glass/Derakane 8084). It is shown that post-curing can have significant positive effects on the initial material properties of glass-reinforced vinyl ester composites. Furthermore, the post-cure of 82ºC for four hours stabilizes the matrix, and as such reduces matrix-related material property evolution. By stopping or nearly stopping material property evolution due to matrix curing over time, the post-cure regime isolates and allows the study of other time-dependent effects, such as fatigue or hygrothermal degradation, and aids designers by establishing an unchanging base set of initial (undamaged) material design properties. The second portion of this dissertation discusses the effects that mean stress and R-ratio have on the fatigue performance of the same material. Qualitative and quantitative differences are seen in the performance as a function of the loading ratio. A residual strength based life prediction model developed at Virginia Tech is applied to the fatigue data, characterizing the material under constant-amplitude loading. Three curve-fitting parameters are then used along with the model to predict variable-amplitude fatigue lives, with remarkably good results. The final portion of the dissertation concerns the effect of hygrothermal and accelerated aging on glass-reinforced composites. A meta-study is performed on data from the literature, and a glass-degradation-based life-prediction model is applied to the data. It is seen that a static fatigue-based activation energy approach to residual strength can predict activation energies associated with glass-reinforced composite strength degradation in the case of glass-reinforced concrete quite well, predicting values of 80-100 kJ/mol, which are similar to those expected for glass dissolution via silica ring opening. The model may also hold some promise for doing the same for glass-reinforced polymer composites.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartJCainDissertationETDSubmission.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectCompositeen_US
dc.subjectDurabilityen_US
dc.subjectFRPen_US
dc.subjectR-ratioen_US
dc.subjectFatigueen_US
dc.subjectHygrothermalen_US
dc.titleLong Term Durability of Glass Reinforced Compositesen_US
dc.typeDissertationen_US
dc.contributor.departmentEngineering Science and Mechanicsen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEngineering Science and Mechanicsen_US
dc.contributor.committeechairCase, Scott W.en_US
dc.contributor.committeememberHyer, Michael W.en_US
dc.contributor.committeememberLesko, John J.en_US
dc.contributor.committeememberRiffle, Judy S.en_US
dc.contributor.committeememberRagab, Saad A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04182008-023917/en_US
dc.date.sdate2008-04-18en_US
dc.date.rdate2008-06-04
dc.date.adate2008-06-04en_US


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