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Analysis and design of composite curved frames

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dc.contributor.authorMason, Brian H.en
dc.contributor.departmentAerospace Engineeringen
dc.date.accessioned2014-03-14T21:37:27Zen
dc.date.adate2009-06-10en
dc.date.available2014-03-14T21:37:27Zen
dc.date.issued1994en
dc.date.rdate2009-06-10en
dc.date.sdate2009-06-10en
dc.description.abstractIn this work, methods for rapid analysis and design of composite curved C-section frames subjected to axial tensile loading are developed. Failure is predicted using polynomial in-plane and interlaminar failure criteria. Interlaminar stresses can be directly computed only from three-dimensional finite element models, but the computational expense of these models is prohibitive. Therefore, approximate two-dimensional analysis methods are used here to predict interlaminar stresses in the curved corner regions between the web and flanges and at the free edges of the flanges. A response surface design approach is used to approximate the failure response using a minimum number of finite element analyses. Large degree of freedom 2D/3D global/local finite element models are selectively used in conjunction with the smaller 2D shell element models in the design process to improve the response surface polynomials. This combined use of simple and complex analyses is known as variable complexity modeling. Two design case studies are conducted, one with two design variables and one with five design variables. Three different objective function formulations are used in the two design variable case, minimum weight, maximum strength, and combined minimum weight and maximum strength. Only the minimum weight formulation is used in the five design variable case due to the complexity of the design space. The design studies demonstrate the accuracy and efficiency of the proposed approach.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 80 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06102009-063304en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06102009-063304/en
dc.identifier.urihttp://hdl.handle.net/10919/43002en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.M3459.pdfen
dc.relation.isformatofOCLC# 31482349en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.M3459en
dc.subject.lcshAirframes -- Design and constructionen
dc.subject.lcshAirframes -- Materialsen
dc.subject.lcshAirframes -- Mathematical modelsen
dc.subject.lcshComposite construction -- Mathematical modelsen
dc.titleAnalysis and design of composite curved framesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineAerospace Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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