Physics-based material constitutive models for the simulation of high-temperature forming of magnesium alloy AZ31

dc.contributor.advisorTaleff, Eric M.en
dc.contributor.committeeMemberBourell, David L.en
dc.contributor.committeeMemberKovar, Desiderioen
dc.contributor.committeeMemberSeepersad, Carolyn C.en
dc.contributor.committeeMemberEngelhardt, Michael D.en
dc.creatorCarpenter, Alexander Jamesen
dc.date.accessioned2012-11-20T15:34:33Zen
dc.date.available2012-11-20T15:34:33Zen
dc.date.issued2012-08en
dc.date.submittedAugust 2012en
dc.date.updated2012-11-20T15:34:53Zen
dc.descriptiontexten
dc.description.abstractMagnesium sheet alloys, such as wrought AZ31, have material properties that make them an attractive option for use in automotive and aircraft components. However, the low ductility of magnesium alloys at room temperature necessitates the use of high-temperature forming to manufacture complex components. Finite-element-method (FEM) simulations can assist in determining the optimum processing parameters for high-temperature forming, but only if an accurate material constitutive model is used. New material constitutive models describing the deformation behavior of AZ31 sheet at 450°C are proposed. These models account for both active deformation mechanisms at this temperature: grain-boundary-sliding creep and five-power dislocation-climb creep. Phenomena affecting these deformation mechanisms, such as material anisotropy and grain growth, are also investigated. This physics-based approach represents an improvement over previous material models, which require nonphysical parameters and can only predict forming for a limited range of conditions. Tensile tests are conducted to obtain data used in fitting constitutive models. New models are used in FEM simulations of both tensile tests and biaxial gas-pressure bulge tests. Simulation results are compared to experimental data for validation and determination of model accuracy.en
dc.description.departmentMechanical Engineeringen
dc.format.mimetypeapplication/pdfen
dc.identifier.slug2152/ETD-UT-2012-08-6024en
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2012-08-6024en
dc.language.isoengen
dc.subjectMagnesiumen
dc.subjectAZ31en
dc.subjectMaterial modelen
dc.subjectSimulationsen
dc.subjectHigh temperatureen
dc.subjectFormingen
dc.titlePhysics-based material constitutive models for the simulation of high-temperature forming of magnesium alloy AZ31en
dc.type.genrethesisen
thesis.degree.departmentMechanical Engineeringen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorUniversity of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen
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