Effects of environmental ageing parameters on interfacial bond properties of carbon fiber tow in epoxy resin: an experimental and numerical study

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dc.contributor Roy, Samit
dc.contributor Weaver, Mark Lovell
dc.contributor.advisor Haque, Anwarul
dc.contributor.author Vemuganti, Shloka
dc.date.accessioned 2017-02-28T22:22:17Z
dc.date.available 2017-02-28T22:22:17Z
dc.date.issued 2009
dc.identifier.other u0015_0000001_0000154
dc.identifier.other Vemuganti_alatus_0004M_10191
dc.identifier.uri https://ir.ua.edu/handle/123456789/660
dc.description Electronic Thesis or Dissertation
dc.description.abstract The effects of environment on the interfacial bond strength of carbon fiber tow embedded in epoxy resin are being studied through accelerated aging experiments and pull-out tests (PT). The goal is to examine the synergistic effects of hot, cold, wet, dry and stressed environment on interfacial bond strength (IFBS) of carbon/epoxy composites in order to forecast life of composites in severe environments. The PT specimens were prepared by embedding a fixed length of a carbon fiber tow in uncured epoxy. The interfacial debonding between resin and fiber tow is the targeted mode of failure. A spring loaded frame was designed for applying a preset load to multiple PT specimens. All the PT specimens including the frames with the stressed specimens were subjected to accelerated environmental aging conditions for different time intervals. The moisture absorption and desorption data were recorded. The PT tests were then carried out by pulling the carbon fiber tow from the cylindrical resin, mounted in a screw driven MTS testing machine. Average IFBS of approximately 21.5 MPa was observed for the unaged control sample. The hot/wet/stressed (70ºC/3% moisture/2 lb) specimens show a significant degradation (-29.03 %) in bond strength after 176 days of aging time. The degradation due to moisture is seen to be more critical under the influence of temperatures (50°C, 70°C). In order to obtain the maximum interfacial shear strength for various embedded lengths and environmental aging parameters, a numerical analysis has been carried out using a 3D finite element model (FEM). A FEM analysis was done using cohesive elements at the fiber/matrix interface in order to study the environmental aging effects at the interface. The predicted bond strength from the numerical analysis was compared with the experimental data. A reasonable agreement was observed between experimental data and Finite Element Analysis (FEA).
dc.format.extent 98 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Engineering, Aerospace
dc.title Effects of environmental ageing parameters on interfacial bond properties of carbon fiber tow in epoxy resin: an experimental and numerical study
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Aerospace Engineering and Mechanics
etdms.degree.discipline Aerospace Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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