Energy Absorption and Progressive Failure Response of Composite Fuselage Frames

dc.contributor.authorPérez, José G.en
dc.contributor.committeechairJohnson, Eric R.en
dc.contributor.committeememberBoitnott, Richard L.en
dc.contributor.committeememberGürdal, Zaferen
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:43:06Zen
dc.date.adate1999-08-26en
dc.date.available2014-03-14T20:43:06Zen
dc.date.issued1999-07-26en
dc.date.rdate2000-08-26en
dc.date.sdate1999-08-09en
dc.description.abstractVertical drop testing of transport aircraft fuselage sections indicates that the frames play a major role in the process of absorbing the impact energy in the crushing of the substructure below the main passenger deck. Hence, static tests are performed on individual circumferential frames under a radially inward load to assess their progressive failure response and energy absorption characteristics. The test articles in the first series of tests are six-foot diameter, semicircular, I-section frames fabricated from graphite-epoxy unidirectional tape. The test articles in the second series of tests are J-section frames subtending a forty-eight degree circular arc, having an inside radius of 118 inches, a depth of 4.8 inches, and manufactured by resin transfer molding into a 2x2 2D triaxial braided composite preform made of AS4 graphite yarns. Frames of both materials exhibit fractures at the pint of load application and at selected locations around the circumference, but the delamination prevalent in the tape layup frames is not evident in the textile frames. A mathematical model developed to optimize open section curved composite frames for improved energy absorption is used to redesign the I-section frames by resizing the flanges. The test results of the redesigned frames show that the mathematical model predicted the correct sequence and locations of the failure events. However, the mathematical model does not predict the magnitude of the force and displacement at the first major failure event, which maybe due to the fact that delamination is not included in the progressive failure model Tests results from two of the J-section frames are compared with a beam finite element analysis using the computer code ABAQUS. Effective elastic moduli for the textile material are obtained from the computer code TEXCAD. The ABAQUS results correlate reasonably well with the experimental results prior to the first major failure event.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-080999-132522en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-080999-132522/en
dc.identifier.urihttp://hdl.handle.net/10919/34447en
dc.publisherVirginia Techen
dc.relation.hasparttitle.pdfen
dc.relation.haspartabstract.pdfen
dc.relation.haspartacknowl.pdfen
dc.relation.haspartTOC1.pdfen
dc.relation.haspartLOF.pdfen
dc.relation.haspartLOT.pdfen
dc.relation.haspartchapter1.pdfen
dc.relation.haspartchapter2.pdfen
dc.relation.haspartchapter3.pdfen
dc.relation.haspartchapter4.pdfen
dc.relation.haspartchapter5.pdfen
dc.relation.haspartchapter6.pdfen
dc.relation.haspartrefer.pdfen
dc.relation.haspartapp1.pdfen
dc.relation.haspartapp2.pdfen
dc.relation.haspartvita.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectEnergy Absorptionen
dc.subjectBraided Compositesen
dc.subjectFuselage Framesen
dc.titleEnergy Absorption and Progressive Failure Response of Composite Fuselage Framesen
dc.typeThesisen
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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