Tensile behavior of unidirectional and cross-ply ceramic matrix composites

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dc.contributor.authorHerrmann, Rebecca K.en
dc.contributor.committeechairKampe, Stephen L.en
dc.contributor.committeememberCurtin, William A. Jr.en
dc.contributor.committeememberAning, Alexander O.en
dc.contributor.committeememberHirschfeld, Deidre A.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T21:46:40Zen
dc.date.adate2008-10-01en
dc.date.available2014-03-14T21:46:40Zen
dc.date.issued1996-02-15en
dc.date.rdate2008-10-01en
dc.date.sdate2008-10-01en
dc.description.abstractThe tensile behavior of two ceramic matrix composites (CMC's) was observed. The materials of interest in this study were a glass-ceramic matrix composite (GCMC) reinforced with Nicalon fibers and a Blackglas™ composite also reinforced with Nicalon fibers. Both had a symmetric cross-ply layup. Initial observations of the composites showed significant porosity and some cracking in the Blackglas™ samples. The GCMC samples showed considerably less damage. From the observed tensile behavior of the cross-ply composites, a 'back-out' factor for determining the 0° ply data of the composite was calculated using Classical Lamination Theory (CLT). The predicted behavior of the 0° ply was then compared to actual data supplied by McDonnell Douglas Corporation. While the Blackglas™ material showed good correlation, the GCMC did not. Analysis indicates that the applicability of this technique is strongly influenced by the initial microstructure of the composite, i.e., porosity, cracking. Fracture mirror measurements were also observed to determine the in-situ strength of the Nicalon fibers. Resulting characteristic strength and Weibull modulus values combined with measured fiber pullout lengths were then used to determine material parameters such as the ultimate tensile strength, strain to failure, work of pullout, sliding distance at the characteristic strength, and interfacial shear stress. Comparisons of measured and calculated ultimate tensile strengths and strains to failure showed good agreement. This research was sponsored by the Naval Surface Warfare Center (NSWC) in Dahlgren VA.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 74 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10012008-063030en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10012008-063030/en
dc.identifier.urihttp://hdl.handle.net/10919/44954en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.H477.pdfen
dc.relation.isformatofOCLC# 35206666en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectceramicsen
dc.subjectcompositesen
dc.subjectClassical Lamination Theoryen
dc.subjectfracture mirrorsen
dc.subject.lccLD5655.V855 1996.H477en
dc.titleTensile behavior of unidirectional and cross-ply ceramic matrix compositesen
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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