Characterization and modeling of the effect of environmental degradation on flexural strength of carbon/epoxy composites

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dc.contributor Haque, Anwarul
dc.contributor Wang, Jialai
dc.contributor.advisor Roy, Samit Chawla, Sneha Anil 2017-02-28T22:27:21Z 2017-02-28T22:27:21Z 2010
dc.identifier.other u0015_0000001_0000292
dc.identifier.other Chawla_alatus_0004M_10273
dc.description Electronic Thesis or Dissertation
dc.description.abstract A mechanism-based modeling methodology has developed for prediction of long-term durability of composites for emerging facilities in different climatic zones. The objective of the research was to develop a predictive tool using the Arrhenius principles adapted to the TTS (Time Temperature Superposition) to measure degradation of carbon-fiber/epoxy composite under hygrothermal exposure and applied tensile stress. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures, viz., hot/dry, hot/wet, cold/dry, and cold/wet. Short term tests were performed to determine the flexural strength of environmentally aged composite specimens in accordance with ASTM D2344-84 and ASTM D7264 respectively. Carbon/epoxy specimens of [02/902]2s configuration were manufactured for flexure tests using Vacuum Assisted Resin Transfer Molding (VARTM). A unique strain fixture was designed to apply constant strain on the specimens during ageing and applied a simple methodology to eliminate excessive creep in the specimens. A two-dimensional cohesive layer constitutive model with a cubic traction-separation law has being developed in order to predict the life of the composite under hygrothermal conditions. The model simulated the test conditions and predicted the progressive failure mechanism of the specimen as observed in the tests, under various loading conditions. The model also incorporated synergistic interactions between temperature, moisture and stress effects and predicted degradation in strength and stiffness as a function of different ageing conditions and ageing times. Model predictions have been benchmarked using test data.
dc.format.extent 117 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 Characterization and modeling of the effect of environmental degradation on flexural strength of carbon/epoxy composites
dc.type thesis
dc.type text University of Alabama. Dept. of Aerospace Engineering and Mechanics Aerospace Engineering The University of Alabama master's M.S.

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