Indentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering properties

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dc.contributor.authorLesko, John J.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:31:58Zen
dc.date.adate2010-03-17en
dc.date.available2014-03-14T21:31:58Zen
dc.date.issued1991-03-05en
dc.date.rdate2010-03-17en
dc.date.sdate2010-03-17en
dc.description.abstractFindings made through the indentation testing of composites are presented in this thesis. The concept was developed as an attempt to evaluate the interfacial shear strength at a mesolevel, possibly overcoming the deficiencies of present techniques. Vickers Microhardness Testing and Continuous Ball Indentation Testing (CBIT) of composite materials provided data for assessing the sensitivity of indentation techniques to interfacial characteristics and engineering properties. Both methods proved capable of discerning the level of fiber-matrix adhesion. The CBIT presented the greatest potential for making quantitative measures of interfacial shear strength. A unique micromechanics model of the contact situation predicted failure events and trends consistent with the observed data from the CBIT. The present elastic model predicted an interfacial shear strength slightly higher than those reported in the literature. However, the interface strength obtained through the CBIT provides more of an engineering assessment of the interfacial quality when compared to other techniques. Both experimental and analytical results suggest that indentation testing of composites is most sensitive to shearing characteristics of the system. Vickers and ball penetration results displayed some correlation to global laminate properties. Vickers hardness shows a close relationship to IITRI compression strength only when fiber compressive failure is observed in the laminate test. The CBIT provides the best opportunity for exploring fiber composite stress-strain information.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 96 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03172010-020329en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03172010-020329/en
dc.identifier.urihttp://hdl.handle.net/10919/41677en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.L485.pdfen
dc.relation.isformatofOCLC# 24041289en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.L485en
dc.subject.lcshComposite materials -- Researchen
dc.titleIndentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering propertiesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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