A method for the geometrically nonlinear analysis of compressively loaded prismatic composite structures

dc.contributor.authorStoll, Fredericken
dc.contributor.committeechairGurdal, Zaferen
dc.contributor.committeememberGriffin, O. Hayden Jr.en
dc.contributor.committeememberHaftka, Raphael T.en
dc.contributor.committeememberHyer, Michael W.en
dc.contributor.committeememberJohnson, Eric R.en
dc.contributor.committeememberReifsnider, Kenneth L.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:20:59Zen
dc.date.adate2005-10-13en
dc.date.available2014-03-14T21:20:59Zen
dc.date.issued1991en
dc.date.rdate2005-10-13en
dc.date.sdate2005-10-13en
dc.description.abstractA method was developed for the geometrically nonlinear analysis of the static response of thin-walled stiffened composite structures loaded in uniaxial or biaxial compression. The method is applicable to arbitrary prismatic configurations composed of linked plate strips, such as stiffened panels and thin-walled columns. The longitudinal ends of the structure are assumed to be simply supported, and geometric shape imperfections can be modelled. The method can predict the nonlinear phenomena of postbuckling strength and imperfection sensitivity which are exhibited by some buckling-dominated structures. The method is computer-based and is semi-analytic in nature, making it computationally economical in comparison to finite element methods. The method uses a perturbation approach based on the use of a series of buckling mode shapes to represent displacement contributions associated with nonlinear response. Displacement contributions which are of second order in the modal amplitudes are incorporated in addition to the buckling mode shapes. The principle of virtual work is applied using a finite basis of buckling modes, and terms through the third order in the modal amplitudes are retained. A set of cubic nonlinear algebraic equations are obtained, from which approximate equilibrium solutions are determined. Buckling mode shapes for the general class of structure are obtained using the VIPASA analysis code within the PASCO stiffened-panel design code. Thus, subject to some additional restrictions in loading and plate anisotropy, structures _ which can be modelled with respect to buckling behavior by VIPASA can be analyzed with respect to nonlinear response using the new method. Results obtained using the method are compared with both experimental and analytical results in the literature. The configurations investigated include several different unstiffened and blade-stiffened panel configurations, featuring both homogeneous, isotropic materials and laminated composite material. Results for the local-postbuckling response of stiffened and unstiffened panels agree well with results in the literature for moderate postbuckling load levels. In flat blade-stiffened panels which exhibit significant interaction of the local and Euler buckling modes, the method is successful in predicting the consequent imperfection sensitivity, but the method loses accuracy as imperfection amplitudes are increased.en
dc.description.degreePh. D.en
dc.format.extentxv, 206 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10132005-152521en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10132005-152521/en
dc.identifier.urihttp://hdl.handle.net/10919/39814en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1991.S765.pdfen
dc.relation.isformatofOCLC# 23716270en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1991.S765en
dc.subject.lcshComposite materials -- Researchen
dc.titleA method for the geometrically nonlinear analysis of compressively loaded prismatic composite structuresen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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