Prediction of crack extension direction in unidirectional composites

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dc.contributor.authorGregory, M. A.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2017-01-30T21:02:37Zen
dc.date.available2017-01-30T21:02:37Zen
dc.date.issued1984en
dc.description.abstractThe purpose of this study was to gain a better understanding of the parameters affecting crack growth direction in unidirectional comĀµosite materials. To achieve this, the effect of anisotropy and biaxial loading on the direction of crack growth in unidirectional off-axis composite materials were investigated. Specific emphasis was placed on defining the crack tip stress field and finding a consistent criterion for predicting the direction of crack growth. Two models are presented to predict the crack tip stress field, an anisotropic elasticity solution and a singular isoparametric finite element formulation. After defining the crack tip stress field, three crack extension direction criteria, the Normal Stress Ratio, the Tensor Polynomial and the Strain Energy Density Criterion, were applied to predict the direction of crack extension. The theoretically predicted crack extension directions were then compared with experimental results. After comparison, it was determined that only the Normal Stress Ratio Criterion correctly predicts the direction of crack extension.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 119 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/74504en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 11637874en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1984.G733en
dc.subject.lcshComposite materials -- Defects -- Testingen
dc.subject.lcshComposite materials -- Fractureen
dc.subject.lcshFracture mechanicsen
dc.titlePrediction of crack extension direction in unidirectional compositesen
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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