Analysis of Tow-Placed, Variable-Stiffness Laminates

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dc.contributor.authorWaldhart, Chrisen
dc.contributor.committeechairGürdal, Zaferen
dc.contributor.committeememberJones, Robert M.en
dc.contributor.committeememberRibbens, Calvin J.en
dc.contributor.departmentEngineering Science and Mechanicsen
dc.date.accessioned2014-03-14T20:51:47Zen
dc.date.adate1996-06-05en
dc.date.available2014-03-14T20:51:47Zen
dc.date.issued1996-06-05en
dc.date.rdate1996-06-05en
dc.date.sdate1998-07-11en
dc.description.abstractIt is possible to create laminae that have spatially varying fiber orientation with a tow placement machine. A laminate which is composed of such plies will have stiffness properties which vary as a function of position. Previous work had modelled such variable-stiffness laminae by taking a reference fiber path and creating subsequent paths by shifting the reference path. This thesis introduces a method where subsequent paths are truly parallel to the reference fiber path. The primary manufacturing constraint considered in the analysis of variable-stiffness laminates was limits on fiber curvature which proved to be more restrictive for parallel fiber laminae than for shifted fiber. The in-plane responses of shifted and parallel fiber variable-stiffness laminates to either an applied uniform end shortening or in-plane shear were determined. Both shifted and parallel fiber variable-stiffness laminates can redistribute the applied load thereby increasing critical buckling loads compared to traditional straight fiber laminates. The primary differences between the two methods is that parallel fiber laminates are not able to redistribute the loading to the degree of the shifted fiber. This significantly reduces the increase in critical buckling load for parallel fiber variable-stiffness laminates over straight fiber laminates.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-520112859651791en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-520112859651791/en
dc.identifier.urihttp://hdl.handle.net/10919/36781en
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.relation.haspartcwaldhar.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecttow placement machineen
dc.subjectcurvilinear fibersen
dc.subjectvariable-stiffness laminatesen
dc.subjectbucklingen
dc.titleAnalysis of Tow-Placed, Variable-Stiffness Laminatesen
dc.typeThesisen
thesis.degree.disciplineEngineering Science and Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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