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dc.contributor.authorGu, Weiqunen_US
dc.date.accessioned2014-03-14T20:21:21Z
dc.date.available2014-03-14T20:21:21Z
dc.date.issued1997-02-17en_US
dc.identifier.otheretd-1642121439711031en_US
dc.identifier.urihttp://hdl.handle.net/10919/30309
dc.description.abstractThe performance of fiber-reinforced composites is often controlled by the properties of the fiber-matrix interface. Good interfacial bonding (or adhesion), to ensure load transfer from matrix to reinforcement, is a primary requirement for effective use of reinforcement properties. Thus, a fundamental understanding of interfacial properties and a quantitative characterization of interfacial adhesion strength can help in evaluating the mechanical behavior and capabilities of composite materials. A large number of analytical techniques have been developed for understanding interfacial adhesion of glass fiber reinforced polymers. Common adhesion tests include contact angle measurements, tension or compression of specially shaped blocks of polymer containing a single fiber, the single fiber pull-out test, single-fiber fragmentation test, short beam shear and transverse tensile tests, and the vibration damping test. Among these techniques, the vibration damping technique has the advantage of being nondestructive as well as highly sensitive for evaluating the interfacial region, and it can allow the materials industry to rapidly determine the mechanical properties of composites. In this work, we contributed a simple optical system for measuring the damping factor of uniaxial fiber-reinforced-polymer composites in the shape of cantilever beams. A single glass fiber- and three single metallic wire-reinforced epoxy resin composites were tested with the optical system. The fiber- (wire-) matrix interfacial adhesion strength measurements were made by microbond test. A reasonable agreement was found between the measured interfacial adhesion strength and micromechanics calculations using results from vibration damping experiments. The study was also extended to multi-fiber composites. The interfacial damping factors in glass-fiber reinforced epoxy-resin composites were correlated with transverse tensile strength, which is a qualitative measurement of adhesion at the fiber-matrix interface. Four different composite systems were tested. For each system, glass fibers with three different surface treatments were used at three different volume fractions. The experimental results also showed an inverse relationship between damping contributed by the interface and composite transverse tensile strength for all of the multi-fiber composites.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartetd.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectvibrationen_US
dc.subjectdampingen_US
dc.subjectinterfaceen_US
dc.subjectadhesionen_US
dc.subjectcompositesen_US
dc.subject.lccLD5655.V856 1997.G8en_US
dc.titleInterfacial Adhesion Evaulation of Uniaxial fiber-Reinforced-Polymer Composites by Vibration Damping of Cantilever Beamen_US
dc.typeDissertationen_US
dc.contributor.departmentMaterials Science and Engineeringen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairLu, Guo-Quanen_US
dc.contributor.committeememberAning, Alexander O.en_US
dc.contributor.committeememberKander, Ronald G.en_US
dc.contributor.committeememberLoos, Alfred C.en_US
dc.contributor.committeememberWu, H. Felixen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-1642121439711031/en_US
dc.contributor.committeecochairKampe, Stephen L.en_US
dc.date.sdate1998-07-13en_US
dc.date.rdate1997-02-17
dc.date.adate1997-02-17en_US


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