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On the interaction of thermal buckling and debonding of patched structures
Descriptive
TitleInfo
Title
On the interaction of thermal buckling and debonding of patched structures
Name
(type = personal)
NamePart
(type = family)
Carabetta
NamePart
(type = given)
Pamela Marie
NamePart
(type = date)
1982-
DisplayForm
Pamela Carabetta
Role
RoleTerm
(authority = RULIB)
author
Name
(type = personal)
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(type = family)
Bottega
NamePart
(type = given)
William J
DisplayForm
William J Bottega
Affiliation
Advisory Committee
Role
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(authority = RULIB)
chair
Name
(type = personal)
NamePart
(type = family)
Baruh
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(type = given)
Haim
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Haim Baruh
Affiliation
Advisory Committee
Role
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(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Benaroya
NamePart
(type = given)
Haym
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Haym Benaroya
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Yong
NamePart
(type = given)
Yook-Kong
DisplayForm
Yook-Kong Yong
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
outside member
Name
(type = corporate)
NamePart
Rutgers University
Role
RoleTerm
(authority = RULIB)
degree grantor
Name
(type = corporate)
NamePart
Graduate School - New Brunswick
Role
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(authority = RULIB)
school
TypeOfResource
Text
Genre
(authority = marcgt)
theses
OriginInfo
DateCreated
(qualifier = exact)
2011
DateOther
(qualifier = exact);
(type = degree)
2011-05
Place
PlaceTerm
(type = code)
xx
Language
LanguageTerm
(authority = ISO639-2b);
(type = code)
eng
Subject
(authority = RUETD)
Topic
Mechanical and Aerospace Engineering
Subject
(authority = ETD-LCSH)
Topic
Thermal stresses
Subject
(authority = ETD-LCSH)
Topic
Structural engineering
RelatedItem
(type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier
(type = RULIB)
ETD
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
(type = local)
rucore19991600001
Note
(type = degree)
Ph.D.
Note
(type = bibliography)
Includes bibliographical references
Note
(type = vita)
Includes vita
Note
(type = statement of responsibility)
by Pamela Marie Carabetta
PhysicalDescription
Form
(authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xvi, 201 p. : ill.
Abstract
(type = abstract)
The widespread use of patched assemblies in engineering structures creates the need for better fundamental understanding of the failure phenomena of such structures to ensure their safe and effective usage. A structure possessing two substructures, the
“patch” and “baseplate”, with mismatched coefficients of thermal expansion is studied under thermal loading for two extreme edge conditions. The composite structure is taken as initially flawed, such that partial separation exists at the edges of the patch between the
two substructures. Two relevant failure mechanisms are sling-shot buckling and edge debonding (separation). Sling-shot buckling, first observed for perfectly intact structures under thermal loads, occurs when the structure dynamically slings from one equilibrium configuration to another in an opposite sense of deflection at a critical load. It is desired
to be able to predict and characterize buckling of the structure, and its coupling with debonding. The geometrically nonlinear problem is formulated via a variational formulation, which allows the boundaries of the domains of the structure to vary in addition to the displacements. The vanishing of the first variation of the potential energy yields governing equilibrium equations, boundary/matching conditions, and transversality
conditions. The transversality condition yields a Griffith type delamination criterion. A closed-form solution is obtained after recasting the problem in a mixed formulation. A stability analysis is performed using the second variation of the potential energy functional. The partially debonded structure is seen to possess a “dual nature”, where it is structurally different depending on the deflection, due to the existence of the initial
flaw. It experiences sling-shot buckling, which, coupled with the structure’s duality leads to what we refer to as “Buckle Trapping.” It is suggested that, for certain critical
temperature fields, the structure oscillates dynamically between unstable equilibrium configurations. In addition, examination of the energy release rate against the bond size reveals a variety of possible behaviors, dependent on flaw size, temperature difference,
and bond strength. It is observed how and when separation leads to thermal buckling, and vice versa. Through this analysis, the onset, extent, and stability of debonding, as well as the relationship with buckling, are diagnosed and characterized.
“patch” and “baseplate”, with mismatched coefficients of thermal expansion is studied under thermal loading for two extreme edge conditions. The composite structure is taken as initially flawed, such that partial separation exists at the edges of the patch between the
two substructures. Two relevant failure mechanisms are sling-shot buckling and edge debonding (separation). Sling-shot buckling, first observed for perfectly intact structures under thermal loads, occurs when the structure dynamically slings from one equilibrium configuration to another in an opposite sense of deflection at a critical load. It is desired
to be able to predict and characterize buckling of the structure, and its coupling with debonding. The geometrically nonlinear problem is formulated via a variational formulation, which allows the boundaries of the domains of the structure to vary in addition to the displacements. The vanishing of the first variation of the potential energy yields governing equilibrium equations, boundary/matching conditions, and transversality
conditions. The transversality condition yields a Griffith type delamination criterion. A closed-form solution is obtained after recasting the problem in a mixed formulation. A stability analysis is performed using the second variation of the potential energy functional. The partially debonded structure is seen to possess a “dual nature”, where it is structurally different depending on the deflection, due to the existence of the initial
flaw. It experiences sling-shot buckling, which, coupled with the structure’s duality leads to what we refer to as “Buckle Trapping.” It is suggested that, for certain critical
temperature fields, the structure oscillates dynamically between unstable equilibrium configurations. In addition, examination of the energy release rate against the bond size reveals a variety of possible behaviors, dependent on flaw size, temperature difference,
and bond strength. It is observed how and when separation leads to thermal buckling, and vice versa. Through this analysis, the onset, extent, and stability of debonding, as well as the relationship with buckling, are diagnosed and characterized.
Identifier
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http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000061144
Location
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NjNbRU
Identifier
(type = doi)
doi:10.7282/T3C53K63
Genre
(authority = ExL-Esploro)
ETD doctoral
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Rights
RightsDeclaration
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The author owns the copyright to this work.
RightsHolder
(type = personal)
Name
FamilyName
Carabetta
GivenName
Pamela
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
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(qualifier = exact);
(point = start)
2011-04-08 09:58:26
AssociatedEntity
Name
Pamela Carabetta
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
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.
RightsEvent
DateTime
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(qualifier = exact);
(point = start)
2011-05-31
DateTime
(encoding = w3cdtf);
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(point = end)
2011-11-30
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after November 30th, 2011.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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