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dc.contributor.advisorNeu, Richard
dc.contributor.authorNeal, Sean Douglas
dc.date.accessioned2014-05-19T15:35:39Z
dc.date.available2014-05-19T15:35:39Z
dc.date.issued2013-03-01
dc.identifier.urihttp://hdl.handle.net/1853/51735
dc.description.abstractHot section components of land-based gas turbines are subject to extremely harsh, high temperature environments and require the use of advanced materials. Directionally solidified Ni-base superalloys are often chosen as materials for these hot section components due to their excellent creep resistance and fatigue properties at high temperatures. These blades undergo complex thermomechanical loading conditions throughout their service life, and the influences of blade geometry and variable operation can make life prediction difficult. Accurate predictions of material response under thermomechanical loading conditions is essential for life prediction of these components. Complex crystal viscoplasticity models are often used to capture the behavior of Ni-base superalloys. While accurate, these models are computationally expensive and are not suitable for all phases of design. This work involves the calibration of a previously developed reduced-order, macroscale transversely isotropic viscoplasticity model to a directionally solidified Ni-base superalloy. The unified model is capable of capturing isothermal and thermomechanical responses in addition to secondary creep behavior. An extreme reduced order microstructure-sensitive constitutive model is also developed using an artificial neural network to provide a rapid first-order approximation of material response under various temperatures, rates of loading, and material orientation from the axis of solidification.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectSuperalloyen_US
dc.subjectNickel baseen_US
dc.subjectDirectionally solidifieden_US
dc.subjectReduced order modelingen_US
dc.subject.lcshHeat resistant alloys
dc.subject.lcshNickel alloys
dc.subject.lcshViscoplasticity
dc.subject.lcshMicrostructure
dc.titleReduced order constitutive modeling of a directionally-solidified nickel-base superalloyen_US
dc.typeThesisen_US
dc.description.degreeM.S.
dc.contributor.departmentMechanical Engineering
dc.embargo.termsnullen_US
thesis.degree.levelMasters
dc.contributor.committeeMemberAntolovich, Stephen
dc.contributor.committeeMemberMcDowell, David L.


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