Interfacial Adhesion Evaulation of Uniaxial fiber-Reinforced-Polymer Composites by Vibration Damping of Cantilever Beam

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dc.contributor.authorGu, Weiqunen
dc.contributor.committeechairLu, Guo-Quanen
dc.contributor.committeecochairKampe, Stephen L.en
dc.contributor.committeememberAning, Alexander O.en
dc.contributor.committeememberKander, Ronald G.en
dc.contributor.committeememberLoos, Alfred C.en
dc.contributor.committeememberWu, H. Felixen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:21:21Zen
dc.date.adate1997-02-17en
dc.date.available2014-03-14T20:21:21Zen
dc.date.issued1997-02-17en
dc.date.rdate1997-02-17en
dc.date.sdate1998-07-13en
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
dc.description.degreePh. D.en
dc.format.extentx, 104 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-1642121439711031en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-1642121439711031/en
dc.identifier.urihttp://hdl.handle.net/10919/30309en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.relation.isformatofOCLC# 38844899en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectvibrationen
dc.subjectdampingen
dc.subjectinterfaceen
dc.subjectadhesionen
dc.subjectcompositesen
dc.subject.lccLD5655.V856 1997.G8en
dc.titleInterfacial Adhesion Evaulation of Uniaxial fiber-Reinforced-Polymer Composites by Vibration Damping of Cantilever Beamen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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