Life prediction of composite materials subjected to long term mechanical/environmental loading condition

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dc.contributor Barkey, Mark E.
dc.contributor Jones, S. E.
dc.contributor Weaver, Mark Lovell
dc.contributor Haque, Anwarul
dc.contributor.advisor Roy, Samit Singh, Sushil 2017-03-01T14:36:48Z 2017-03-01T14:36:48Z 2010
dc.identifier.other u0015_0000001_0000454
dc.identifier.other Singh_alatus_0004D_10535
dc.description Electronic Thesis or Dissertation
dc.description.abstract A multi-scale mechanism-based life prediction model is developed for high-temperature polymer matrix composites (HTPMC) under thermo-oxidative aging conditions. Life prediction model is based on stiffness and strength degradation in unidirectional HTPMC under accelerated thermo-oxidative aging condition. A multi-scale model based on continuum damage mechanics to predict stiffness degradation and progressive failure due to degradation of inter-laminar shear strength is developed for unidirectional composite. Using continuum damage mechanics one can relate the behavior of composites at micro-level (representative volume element) to the macro-level (structural element). Thermo-oxidative aging is simulated with diffusion-reaction model in which temperature, oxygen concentration and weight loss effects are considered. For fiber/matrix debond growth simulation, a model based on Darcy's laws for oxygen permeation in the fiber-matrix interface is employed, that, when coupled with polymer shrinkage, provides a mechanism for permeation-controlled debond growth in HTPMC. Viscoelastic regularization in the constitutive equations of the cohesive layer used in this model not only mitigates numerical instability, but also enables the analysis to follow load-deflection behavior beyond the point of peak failure load. Benchmark of model prediction with experiment was carried out to establish proof-of-concept.
dc.format.extent 107 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 Aerospace Engineering
dc.subject.other Mechanical Engineering
dc.title Life prediction of composite materials subjected to long term mechanical/environmental loading condition
dc.type thesis
dc.type text University of Alabama. Dept. of Aerospace Engineering and Mechanics Engineering Science and Mechanics The University of Alabama doctoral Ph.D.

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