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A micromechanics study on carbon-based and multiferroic composites

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Title
A micromechanics study on carbon-based and multiferroic composites
Name (type = personal)
NamePart (type = family)
Wang
NamePart (type = given)
Yang
NamePart (type = date)
1988-
DisplayForm
Yang Wang
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Weng
NamePart (type = given)
George J.
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George J. Weng
Affiliation
Advisory Committee
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chair
Name (type = personal)
NamePart (type = family)
Pelegri
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Assimina A.
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Assimina A. Pelegri
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Advisory Committee
Role
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internal member
Name (type = personal)
NamePart (type = family)
Shan
NamePart (type = given)
Jerry
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Jerry Shan
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Li
NamePart (type = given)
Jackie
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Jackie Li
Affiliation
Advisory Committee
Role
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outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
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school
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Text
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theses
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2016
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2016-05
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2016
Place
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xx
Language
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eng
Abstract (type = abstract)
In this thesis, two physical properties of modern composites are studied. One is the electrical conductivity of carbon nanotube- and graphene-based polymer nanocomposites, and the other is the magnetoelectric coupling of highly anisotropic piezoelectric-piezomagnetic multiferroic composites. Along the way, several related issues have also been examined. These include percolation threshold, interfacial resistance, electron tunneling, and filler agglomeration in the first case, and, in the second one, the influence of aspect ratio of inclusions, imperfect interface, and phase connectivity. The studies of these two problems are linked by the common theme of micromechanics theory but cast in different settings. The effective electrical conductivity and percolation threshold of CNT-based nanocomposites are investigated with the effective-medium approach as the backbone. We then introduce of a diminishing layer of interface with an interfacial resistivity that is further modified by Cauchy's statistical distribution function to account for the additional tunneling-assisted interfacial conductivity. The issue of filler agglomeration is examined in details for graphene-based nanocomposites, in which a two-scale effective-medium approach with graphene-rich and graphene-poor regions is also developed. Our predictions are shown to be in close agreement with experimental data. For multiferroic composites, our focus is on the intriguing property of magnetoelectric coupling coefficient which is absent in either piezoelectric or piezomagnetic phase but owned by overall composites. We study this iconic effect in depth for BaTiO3-CoFe2O4 system with different types of connectivity, including 1-3, 0-3, 2-2, that display the inclusion-matrix morphology, and 1-1, 0-0 connectivity that are marked by their symmetric geometrical footing. These two classes of composites are analyzed by the Mori-Tanaka method and the effective-medium approach, respectively. We demonstrate how the magnetoelectric coupling coefficients are highly dependent on the phase volume concentration, inclusion aspect ratio, interface effect, and phase connectivity. Our results also reveal that the magnetoelectric coupling of 0-0 connectivity are substantially higher than that of 0-3 connectivity, but the difference between 1-1 and 1-3 connectivity is limited. In the end, we point to the need of exploring the physical mechanism of interfacial resistance for carbon-based nanocomposites and the nonlinear coupling behaviors for ferroelectric-ferromagnetic composites in our future work.
Subject (authority = RUETD)
Topic
Mechanical and Aerospace Engineering
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_7207
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (xviii, 141 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Subject (authority = ETD-LCSH)
Topic
Micromechanics
Subject (authority = ETD-LCSH)
Topic
Nanostructured materials
Note (type = statement of responsibility)
by Yang Wang
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3PN97TX
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The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Wang
GivenName
Yang
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2016-04-13 18:44:23
AssociatedEntity
Name
Yang Wang
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
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License
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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.
Copyright
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Copyright protected
Availability
Status
Open
Reason
Permission or license
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