Creep predictions for turbomachinery components

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dc.contributor.advisorPenny, R Ken_ZA
dc.contributor.authorSieburg, H Oen_ZA
dc.date.accessioned2016-04-07T10:19:53Z
dc.date.available2016-04-07T10:19:53Z
dc.date.issued1989en_ZA
dc.description.abstractSeveral theories of creep and creep rupture are reviewed. Specific attention is devoted to the brittle damage theory proposed by Kachanov. Creep, damage and life predictions for rectangular or circular cross section beams under bending and tensile loads are presented. Comparison with data for a Ni Superalloy showed life predictions could be 30X in excess of experimental values. This beam model also revealed that it is imperative that no bending moments be inadvertently applied during tensile creep testing. The creep-damage material model is extended to multidimensional situations. A refinement, whereby no damage accumulates in compression, is incorporated. A User-Material subroutine for this constitutive model has been formulated, and incorporated into the ABAQUS FEM package. Several verification examples are presented; one example is the creep-damage behaviour of a notched bar in tension. The value of reference stress techniques is discussed. Reference stress estimates for a centrifugally loaded bar, as well as for a cantilever under distributed loads, are presented. These could be useful in turbine blade design. Bibliography: pages 91-92.en_ZA
dc.identifier.apacitationSieburg, H. O. (1989). <i>Creep predictions for turbomachinery components</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/18697en_ZA
dc.identifier.chicagocitationSieburg, H O. <i>"Creep predictions for turbomachinery components."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1989. http://hdl.handle.net/11427/18697en_ZA
dc.identifier.citationSieburg, H. 1989. Creep predictions for turbomachinery components. University of Cape Town.en_ZA
dc.identifier.risTY - Thesis / Dissertation AU - Sieburg, H O AB - Several theories of creep and creep rupture are reviewed. Specific attention is devoted to the brittle damage theory proposed by Kachanov. Creep, damage and life predictions for rectangular or circular cross section beams under bending and tensile loads are presented. Comparison with data for a Ni Superalloy showed life predictions could be 30X in excess of experimental values. This beam model also revealed that it is imperative that no bending moments be inadvertently applied during tensile creep testing. The creep-damage material model is extended to multidimensional situations. A refinement, whereby no damage accumulates in compression, is incorporated. A User-Material subroutine for this constitutive model has been formulated, and incorporated into the ABAQUS FEM package. Several verification examples are presented; one example is the creep-damage behaviour of a notched bar in tension. The value of reference stress techniques is discussed. Reference stress estimates for a centrifugally loaded bar, as well as for a cantilever under distributed loads, are presented. These could be useful in turbine blade design. Bibliography: pages 91-92. DA - 1989 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1989 T1 - Creep predictions for turbomachinery components TI - Creep predictions for turbomachinery components UR - http://hdl.handle.net/11427/18697 ER -en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18697
dc.identifier.vancouvercitationSieburg HO. Creep predictions for turbomachinery components. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1989 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18697en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.subject.otherTurbomachinesen_ZA
dc.subject.otherMaterials - Creepen_ZA
dc.titleCreep predictions for turbomachinery componentsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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