Integrated structural analysis and design using 3-D finite elements

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dc.contributor.authorMadapur, Umaen
dc.contributor.committeechairHaftka, Raphael T.en
dc.contributor.committeememberKapania, Rakesh K.en
dc.contributor.committeememberGürdal, Zaferen
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T21:39:01Zen
dc.date.adate2010-06-22en
dc.date.available2014-03-14T21:39:01Zen
dc.date.issued1988-05-15en
dc.date.rdate2010-06-22en
dc.date.sdate2010-06-22en
dc.description.abstractWhen structural analysis is performed via iterative solution technique it is possible to integrate the analysis and design iterations in an integrated analysis and design procedure. The present work seeks to apply an integrated analysis and design approach due to Rizk to the problem of hole shape optimization in thick plates. The plates are modeled by three dimensional eight noded elements. An element by element (EBE) preconditioned conjugate gradient (PCG) method is used for the structural analysis, because this method is well suited for poorly banded three dimensional problems. The plates were optimized so as to minimize the stress concentration near the hole measured by the ratio of the Von Mises stress to the applied boundary stress. The analysis program was validated by comparison to a commercial finite-element program as well as photoelastically obtained stress concentrations. Similarly, the optimization procedure was checked against plates optimized by a photoelastic technique. Good agreement was observed. The integrated analysis and design approach tested here is based on partially converged solutions of the EBE-PCG iterative process. A study of the effect of the number of iterations on analysis and derivative accuracy was performed. Based on this analysis a choice was made for the number of iterations to be used in the integrated analysis and design procedure. It was found that the cost of the design could be significantly reduced with only minimal effects on the final shape and stress concentration factor.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 67 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06222010-020306en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06222010-020306/en
dc.identifier.urihttp://hdl.handle.net/10919/43407en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1988.M323.pdfen
dc.relation.isformatofOCLC# 18567924en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.M323en
dc.subject.lcshFinite element methoden
dc.subject.lcshStructural analysis (Engineering)en
dc.titleIntegrated structural analysis and design using 3-D finite elementsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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