dc.contributor.author	Pérez, José G.	en
dc.contributor.committeechair	Johnson, Eric R.	en
dc.contributor.committeemember	Boitnott, Richard L.	en
dc.contributor.committeemember	Gürdal, Zafer	en
dc.contributor.department	Aerospace and Ocean Engineering	en
dc.date.accessioned	2014-03-14T20:43:06Z	en
dc.date.adate	1999-08-26	en
dc.date.available	2014-03-14T20:43:06Z	en
dc.date.issued	1999-07-26	en
dc.date.rdate	2000-08-26	en
dc.date.sdate	1999-08-09	en
dc.description.abstract	Vertical 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.degree	Master of Science	en
dc.identifier.other	etd-080999-132522	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-080999-132522/	en
dc.identifier.uri	http://hdl.handle.net/10919/34447	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	title.pdf	en
dc.relation.haspart	abstract.pdf	en
dc.relation.haspart	acknowl.pdf	en
dc.relation.haspart	TOC1.pdf	en
dc.relation.haspart	LOF.pdf	en
dc.relation.haspart	LOT.pdf	en
dc.relation.haspart	chapter1.pdf	en
dc.relation.haspart	chapter2.pdf	en
dc.relation.haspart	chapter3.pdf	en
dc.relation.haspart	chapter4.pdf	en
dc.relation.haspart	chapter5.pdf	en
dc.relation.haspart	chapter6.pdf	en
dc.relation.haspart	refer.pdf	en
dc.relation.haspart	app1.pdf	en
dc.relation.haspart	app2.pdf	en
dc.relation.haspart	vita.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	Energy Absorption	en
dc.subject	Braided Composites	en
dc.subject	Fuselage Frames	en
dc.title	Energy Absorption and Progressive Failure Response of Composite Fuselage Frames	en
dc.type	Thesis	en
thesis.degree.discipline	Aerospace and Ocean Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	masters	en
thesis.degree.name	Master of Science	en

Energy Absorption and Progressive Failure Response of Composite Fuselage Frames

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