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Effects of geometric nonlinearities and uniform temperature fields on the detachment of patched beam-plates under pressure loading
Descriptive
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Title
Effects of geometric nonlinearities and uniform temperature fields on the detachment of patched beam-plates under pressure loading
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Carabetta
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Pamela
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Pamela Carabetta
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Bottega
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William
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Advisory Committee
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William J Bottega
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chair
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Haim
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Advisory Committee
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Haim Baruh
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internal member
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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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Rutgers University
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Graduate School - New Brunswick
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theses
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2007
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2007
Language
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English
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electronic
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Extent
xi, 198 pages
Abstract
Patched structures have many engineering applications, ranging from aircraft repair to electronic devices and beyond. Delamination growth at the edge of the interface between the substructures may lead to catastrophic results. In the spirit of preventing this, edge delamination failure is studied such that behavior may be predicted as well as characterized for a patched beam-plate structure under different physical conditions. The loading scenario on such structures includes transverse pressure and an applied uniform temperature field. These conditions are intended to mimic possible conditions under which a patched beam-plate may be used. The patched beam-plate consists of two plates: the "patch," which is of shorter length, adhered to the longer "baseplate". This composite structure is examined under various support conditions on the endpoints: hinged-free, clamped-free, hinged-fixed, and clamped-fixed.
The problem is formulated analytically, from first principles, using linear and geometrically nonlinear models. Governing equations are derived using a local force balance on an element of the structure incorporating an appropriate geometrically nonlinear thin structure theory, and can be reduced accordingly to simplify to a corresponding linear model. A Griffith type criterion, is adopted to determine the onset of delamination growth. Exact analytical solutions are obtained for nonlinear as well as linear problems and numerical simulations based on these solutions are performed using MATLAB.
Results are presented in the form of delamination growth paths, which may be interpreted physically to describe the onset, extent, and stability of the delamination growth resulting from each scenario. The effect of various physical parameters on delamination behavior is explored. The results show that a temperature difference has a profound effect on the delamination behavior of the patched plates when subject to transverse pressure, as it significantly alters the delamination growth thresholds. There are scenarios where delamination propagation begins in the absence of transverse pressure, due solely to the applied temperature difference. Conclusions are drawn and physical explanations are given for the behavior of each patched plate system. The nonlinear model reveals different delamination growth thresholds and stabilities than the linear model. It observed that the linear model does not adequately describe the salient behavior in comparison to the nonlinear model.
The problem is formulated analytically, from first principles, using linear and geometrically nonlinear models. Governing equations are derived using a local force balance on an element of the structure incorporating an appropriate geometrically nonlinear thin structure theory, and can be reduced accordingly to simplify to a corresponding linear model. A Griffith type criterion, is adopted to determine the onset of delamination growth. Exact analytical solutions are obtained for nonlinear as well as linear problems and numerical simulations based on these solutions are performed using MATLAB.
Results are presented in the form of delamination growth paths, which may be interpreted physically to describe the onset, extent, and stability of the delamination growth resulting from each scenario. The effect of various physical parameters on delamination behavior is explored. The results show that a temperature difference has a profound effect on the delamination behavior of the patched plates when subject to transverse pressure, as it significantly alters the delamination growth thresholds. There are scenarios where delamination propagation begins in the absence of transverse pressure, due solely to the applied temperature difference. Conclusions are drawn and physical explanations are given for the behavior of each patched plate system. The nonlinear model reveals different delamination growth thresholds and stabilities than the linear model. It observed that the linear model does not adequately describe the salient behavior in comparison to the nonlinear model.
Note
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M.S.
Note
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Includes bibliographical references (p. 144-146).
Subject
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Topic
Mechanical and Aerospace Engineering
Subject
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Topic
Composite materials--Delamination
Subject
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Topic
Plates (Engineering)
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.15793
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ETD_398
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doi:10.7282/T3QF8T93
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ETD graduate
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The author owns the copyright to this work.
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Open
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Pamela Carabetta
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Rutgers University. Graduate School - New Brunswick
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Non-exclusive ETD license
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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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