Experimental and computational investigation of the effect of environmental degradation on interlaminar shear strength of carbon/epoxy composites

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dc.contributor Haque, Anwarul
dc.contributor Wang, Jialai
dc.contributor.advisor Roy, Samit
dc.contributor.author Akepati, Avinash Reddy
dc.date.accessioned 2017-03-01T14:36:24Z
dc.date.available 2017-03-01T14:36:24Z
dc.date.issued 2010
dc.identifier.other u0015_0000001_0000423
dc.identifier.other AKEPATI_alatus_0004M_10415
dc.identifier.uri https://ir.ua.edu/handle/123456789/928
dc.description Electronic Thesis or Dissertation
dc.description.abstract The effect of environmental and loading conditions on the degradation of Interlaminar Shear Strength (ILSS) of the carbon-epoxy composite specimens was studied in the current research. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures. Short beam shear tests (SBST) were performed to determine the Interlaminar Shear Strength (ILSS) of environmentally aged composite specimens in accordance with ASTM D2344-84. Initially, a standard two-dimensional cohesive layer constitutive model with a cubic traction-separation law was employed in order to simulate the experiment using an in-house Finite Element Analysis code (NOVA-3D). Numerical instabilities encountered using the standard elastic cohesive layer model were overcome by incorporating viscoelastic regularization in the constitutive equations of the cohesive layer. This modification also enabled the analysis to continue beyond the point of peak failure load. The model was able to accurately simulate the load-deflection behavior of most of the SBST specimens aged under various hygrothermal and synergistically applied stress conditions. Further, the effect of displacement rate on ILSS of specimens was studied using NOVA-3D. A PC based life prediction software, Composite Performance Predictive Tool (CPPT), was developed using a mechanism-based degradation model in order to predict the life of a composite structure under given environmental and loading conditions. The software was benchmarked using the test data.
dc.format.extent 116 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.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Engineering, Aerospace
dc.title Experimental and computational investigation of the effect of environmental degradation on interlaminar shear strength of carbon/epoxy composites
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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