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dc.contributor.authorDevarajan, Balakrishnanen_US
dc.date.accessioned2020-07-26T06:00:51Z
dc.date.available2020-07-26T06:00:51Z
dc.date.issued2019-02-01
dc.identifier.othervt_gsexam:18747en_US
dc.identifier.urihttp://hdl.handle.net/10919/99425
dc.description.abstractThis dissertation discusses the thermomechanical analyses performed on threaded fasteners and curvilinearly stiffened composite panels with internal cutouts. The former problem was analyzed using a global/local approach using the commercial finite element software ANSYS while a fully functional code using isogeometric analysis was developed from scratch for the latter. For the threaded fasteners, a global simplified 3D model is built to evaluate the deformation of the structure. A second local model reproducing accurately the threads of the fasteners is used for the accurate assessment of the stresses in the vicinity of the fasteners. The isogeometric analysis code, capable of performing static, buckling and vibration analysis on stiffened composite plates with cutouts using single patch, multiple patches and level set methods is then discussed. A novel way to achieve displacement compatibility between the panel and stiffeners interfaces is introduced. An easy way of modeling plates with complicated cutouts by using edge curves and generating a ruled NURBS surface between them is described. Influence on the critical thermal buckling load and the fundamental mode of vibration due to the presence of circular, elliptical and complicated cutouts is also investigated. Results of parametric studies are presented which show the influence of ply orientation, size and orientation of the cutout, and the position and profile of the curvilinear stiffener. The numerical examples show high reliability and efficiency when compared with other published solutions and those obtained using ABAQUS, a commercial software.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis item is protected by copyright and/or related rights. Some uses of this item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectThermomechanicalen_US
dc.subjectstiffeneren_US
dc.subjectthreaded fastenersen_US
dc.subjectisogeometric analysisen_US
dc.subjectNURBSen_US
dc.subjectdynamic and eigenvalue analysisen_US
dc.titleThermomechanical and Vibration Analysis of Stiffened Unitized Structures and Threaded Fastenersen_US
dc.typeDissertationen_US
dc.contributor.departmentEngineering Science and Mechanicsen_US
dc.description.degreePHDen_US
thesis.degree.namePHDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEngineering Mechanicsen_US
dc.contributor.committeechairKapania, Rakesh Ken_US
dc.contributor.committeememberCramer, Mark Sen_US
dc.contributor.committeememberRagab, Saad Aen_US
dc.contributor.committeememberSeidel, Gary Den_US
dc.contributor.committeememberCase, Scott Wen_US


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