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Characterizing and controlling carbon fiber orientations in a polymer via flow and electric-field alignment
Descriptive
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Title
Characterizing and controlling carbon fiber orientations in a polymer via flow and electric-field alignment
Name
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Zawacki
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Ava
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Ava Zawacki
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author
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Shan
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Jerry
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Jerry W Shan
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Advisory Committee
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chair
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Drazer
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German
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German Drazer
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Advisory Committee
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member
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Malhotra
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Rajiv
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Rajiv Malhotra
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Advisory Committee
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member
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Rutgers University
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School of Graduate Studies
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theses
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2023
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2023-01
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English
Abstract
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Carbon fiber composites (CFC) are common in applications where high strength and low density are desired. More specifically, discontinuous CFC are recognized for their high manufacturability and low cost compared to continuous CFCs. Unique to discontinuous CFs is the ability to change orientation, thereby controlling the anisotropy of the material. Many previous works have used flow or electric fields to vastly improve the CF alignment unidirectionally. What is of interest in this study is to utilize both flow and an electric field, in contrast, to manipulate the orientation of the CFs beyond unidirectional alignment in an epoxy. Analyzing flow and electric field induced torques individually and in combination, we create a way to specify CF orientations within a composite matrix. This gives way to more complex geometries and material properties, and has great potential, specifically in additive manufacturing processes.To examine this relationship, a channel is constructed which creates fiber alignment in the direction of the flow. The alignment mechanisms for this channel are studied through simulation and experimentation to explain the CF orientations. An electric field is then utilized to align CFs perpendicular to the flow direction. To obtain the rotation rate at varying electric field strengths, stationary fibers are studied, and we find the orientation of the fiber is directly related to the time fibers are exposed to the electric field. Because the flow alignment mechanisms are much weaker beyond the inlet, we can assume the effect of the electric field is dominant in this region. This means the resulting CF orientations are dependent on the orientation distribution of the fibers that have entered the channel, the electric field strength, and the amount of time the fibers are influenced by the electric field. This insight allows us to tune our system to create desired alignment.
Subject
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Topic
Mechanical engineering
Subject
(authority = local)
Topic
Alignment
Subject
(authority = local)
Topic
Carbon fiber
Subject
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Topic
Channel
Subject
(authority = local)
Topic
Electric field
Subject
(authority = local)
Topic
Orientation
Subject
(authority = local)
Topic
Polymer
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Rutgers University Electronic Theses and Dissertations
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http://dissertations.umi.com/gsnb.rutgers:12339
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text/xml
Extent
75 pages : illustrations
Note
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M.S.
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Includes bibliographical references
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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NjNbRU
Identifier
(type = doi)
doi:10.7282/t3-tsnt-y539
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Rights
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The author owns the copyright to this work.
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Name
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Zawacki
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Ava
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Permission or license
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2023-02-23T13:47:27
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Ava Zawacki
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Affiliation
Rutgers University. School of Graduate Studies
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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
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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2023-01-11T20:35:59
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Microsoft: Print To PDF
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