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Study of simplified models of aircraft structures subjected to generalized explosive loading

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TitleInfo (displayLabel = Citation Title); (type = uniform)
Title
Study of simplified models of aircraft structures subjected to generalized explosive loading
Name (ID = NAME001); (type = personal)
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Florek
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Jason R.
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Jason R. Florek
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Benaroya
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Haym
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Advisory Committee
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Haym Benaroya
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chair
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Baruh
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Haim
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Advisory Committee
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Haim Baruh
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Cuitino
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Alberto
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Advisory Committee
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Alberto Cuitino
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internal member
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Gucunski
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Nenad
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Advisory Committee
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Nenad Gucunski
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outside member
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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school
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theses
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DateCreated (qualifier = exact)
2007
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2007
Language
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English
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electronic
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application/pdf
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xv, 149 pages
Abstract
This dissertation develops a simple methodology for estimating the maximum elastic-plastic deformation of thin, rectangular plates due to an exponentially decaying pressure pulse. Initially, only small plates, representative of aircraft skin panels, and uniformly distributed pressures are examined. The deflections predicted by this procedure are compared with those attained from finite element analysis for various plate dimensions and blast intensities. Material properties and boundary conditions are also varied. It is found that the current, clamped single-degree-of-freedom model is generally a much better predictor of deflection than its simply supported counterpart, although both show average errors of less than 15% compared to finite element results. The deviations between all of the models tend to decrease as surface area decreases, or as plate thickness and aspect ratio increase. A means of approximating permanent plate deflection is also suggested, which favorably compares with previously published experimental results for square, aluminum plates.
The aforementioned procedure is then extended for use with larger geometries, namely a wider fuselage section and a panel of an onboard luggage container, and nonuniform pressures. A generalized distribution function is developed to account for nonuniformities consistent with detonations at a small standoff distance. Moreover, two normalized criteria are proposed to determine when these nonuniformities can be ignored. In addition, large discrepancies are found in calculated deflections when incorporating the current structural model and the blast parameter data from two commonly used sources for both uniform and nonuniform loading cases. As a result, uncertainties in these data are thoroughly examined, which leads to confidence bounds being placed on all calculated deflections through a Monte Carlo scheme. This, in turn, allows for the generation of probability of failure curves.
Suggestions for improving the current loading and structural models are also discussed. Finally, the method of analysis for plates is preliminarily extended for the blast loading of thin, cylindrical shells. The various topics covered and simplified models proposed are useful to both the experimentalist and designer of blast resistant structures.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references (p. 141-147).
Subject (ID = SUBJ1); (authority = RUETD)
Topic
Mechanical and Aerospace Engineering
Subject (ID = SUBJ2); (authority = ETD-LCSH)
Topic
Explosives
Subject (ID = SUBJ3); (authority = ETD-LCSH)
Topic
Blast effect
Subject (ID = SUBJ4); (authority = ETD-LCSH)
Topic
Plates (Engineering)
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.15854
Identifier
ETD_546
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3X34XWV
Genre (authority = ExL-Esploro)
ETD doctoral
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The author owns the copyright to this work.
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Name
Jason Florek
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Affiliation
Rutgers University. Graduate School - New Brunswick
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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