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dc.contributor.advisorNeu, Richard W.
dc.contributor.authorEstrada Rodas, Ernesto Alejandro
dc.date.accessioned2018-05-31T18:09:02Z
dc.date.available2018-05-31T18:09:02Z
dc.date.created2017-05
dc.date.issued2017-04-06
dc.date.submittedMay 2017
dc.identifier.urihttp://hdl.handle.net/1853/59788
dc.description.abstractAn enhanced generation temperature-dependent crystal viscoplasticity (CVP) model targeting the creep-fatigue interactions in Ni-base superalloys single-crystals is developed. The model is fitted to experimental data obtained on superalloy CMSX-8. At the microstructure level of interest, superalloys are comprised of an ordered and a disordered face-centered cubic phase. However, few models explicitly account for the deformation mechanisms active on each phase. In this work, a novel approach is used to model both material phases and to bridge several length scales. To this end, a physically-based approach is utilized to model the microstructure morphology, the distinct deformation mechanisms that become active on each material phase, and the evolution of dislocation densities. This increased fidelity leads to challenges in implementation which are addressed by developing a new quasi Newton-Raphson algorithm. The algorithm enables application in commercially-available displacement-based Finite Element codes. The CVP model can help designers predict component response using realistic geometries and boundary conditions. This model is also a first step toward an Integrated Computational Materials Engineering (ICME) tool that could be used to enhance current understanding of superalloys and alloy design.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectSuperalloys
dc.subjectCreep-fatigue
dc.subjectFatigue
dc.subjectThermomechanial fatigue
dc.subjectCreep
dc.subjectConstitutive behavior
dc.subjectCrystal plasticity
dc.subjectAlloy design
dc.subjectAlgorithms
dc.titleMicrostructure-sensitive creep-fatigue interaction crystal-viscoplasticity model for single-crystal nickel-base superalloys
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentMechanical Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberGerhardt, Rosario A.
dc.contributor.committeeMemberKalidindi, Surya R.
dc.contributor.committeeMemberMcDowell, David L.
dc.contributor.committeeMemberPierron, Oliver N.
dc.date.updated2018-05-31T18:09:02Z


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