Measurement of ultrasonic wave mode transition in unidirectional graphite/epoxy composites

dc.contributor.authorVandenbossche, Benoiten
dc.contributor.committeechairKriz, Ronald D.en
dc.contributor.committeememberGordon, Ronald S.en
dc.contributor.committeememberHendricks, Robert W.en
dc.contributor.committeememberHenneke, Edmund G.en
dc.contributor.departmentMaterials Engineeringen
dc.date.accessioned2014-03-14T21:48:13Zen
dc.date.adate2009-10-24en
dc.date.available2014-03-14T21:48:13Zen
dc.date.issued1991en
dc.date.rdate2009-10-24en
dc.date.sdate2009-10-24en
dc.description.abstractThe wave propagation mechanism of mode transitions was studied in unidirectional composite materials. Theoretical calculations were compared with experimental measurements. Mode transitions occur when the wave vector orientation is varied in unidirectional samples of T300/5208 graphite/epoxy composite with a 0.6 fiber volume fraction. The mode transition occurs at 51.85° wave vector orientation with respect to the fiber direction. Energy flux deviation and particle displacement directions and amplitudes were also compared with theory. To show this mode transition, an attenuation study was performed. The attenuation coefficient, measured in units of reciprocal time, does not appear to depend on the wave vector orientation and the wave type (quasi-transverse and quasi-longitudinal waves) at 5 MHz frequency. But the attenuation coefficient, expressed in units of reciprocal length, does depend on the wave type and the wave vector orientation because the wave velocity is included in the calculation of this coefficient.en
dc.description.degreeMaster of Scienceen
dc.format.extentxv, 250 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10242009-020340en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10242009-020340/en
dc.identifier.urihttp://hdl.handle.net/10919/45317en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.V364.pdfen
dc.relation.isformatofOCLC# 24111895en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.V364en
dc.subject.lcshAnisotropy -- Researchen
dc.subject.lcshComposite materialsen
dc.subject.lcshGraphiteen
dc.titleMeasurement of ultrasonic wave mode transition in unidirectional graphite/epoxy compositesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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