Quasi-Static and Fatigue Evaluation of Pultruded Vinyl Ester/E-Glass Composites

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dc.contributor.authorPhifer, Stephan Paulen
dc.contributor.committeechairLesko, John J.en
dc.contributor.committeememberKapania, Rakesh K.en
dc.contributor.committeememberGao, David Y.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T20:31:14Zen
dc.date.adate1999-02-02en
dc.date.available2014-03-14T20:31:14Zen
dc.date.issued1998-12-17en
dc.date.rdate1999-02-02en
dc.date.sdate1999-01-31en
dc.description.abstractThe quasi-static strength, stiffness, and fatigue properties of cross-ply, angle-ply, and quasi-isotropic vinyl ester/E-glass non-woven tricot stitched fabric composite laminates fabricated from the Continuous Resin Transfer Molding (CRTM) pultrusion process were the focus of this research. The tricot stitch and the 6% vinyl ester matrix cure shrinkage were found to play key roles in the quasi-static and fatigue strength and stiffness properties of these laminates. Laminates tested transverse to the pultrusion axis had greater fiber undulation and maximum of 44% quasi-static strength reduction and 8% stiffness reduction compared with axially tested specimens. While the matrix failure strain was 1.9%, failure strain of these laminates range over 1.91 to 2.08% when tested along the pultrusion axis and as low as 1.29% transverse to the pultrusion axis. Fatigue evaluation, in load control mode, evaluated laminate S-N, stiffness reduction, and residual strength. Measured S-N curves and residual strength curves compared with literature were found most like woven fabric laminates, well below aerospace grade laminates. Residual strength and life analysis using Reifsnider's methodology [43], revealed that the choice of quasi-static strength and stiffness, S-N curve, laminate stiffness reduction, and residual strength shape parameter, J, strongly affect predicted life. Predictions at high fatigue stress/low cycle were more exact than at low stress; the S-N curve was steep initially but at low stress/high cycle was nearly horizontal. The best predictions utilized separate off-axis stiffness reductions of E2 obtained from cross-ply and G12 from angle-ply laminates, the quasi-static strength and stiffness of the laminate predicted, and the average S-N and residual strength curves.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-013199-185939en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-013199-185939/en
dc.identifier.urihttp://hdl.handle.net/10919/31093en
dc.publisherVirginia Techen
dc.relation.haspartSETD.PDFen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFatigueen
dc.subjectCompositeen
dc.subjectResidual Strengthen
dc.subjectPultrusionen
dc.titleQuasi-Static and Fatigue Evaluation of Pultruded Vinyl Ester/E-Glass Compositesen
dc.typeThesisen
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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