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Creep predictions for turbomachinery components
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 S...
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| Format: | Thesis |
| Language: | English |
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Department of Mechanical Engineering
2016
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| _version_ | 1867613271038623744 |
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| access_status_str | Open Access |
| author | Sieburg, H O |
| author2 | Penny, R K |
| author_browse | Penny, R K Sieburg, H O |
| author_facet | Penny, R K Sieburg, H O |
| author_sort | Sieburg, H O |
| collection | Thesis |
| description | 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. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18697 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:28.738Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18697 Creep predictions for turbomachinery components Sieburg, H O Penny, R K Mechanical Engineering Turbomachines Materials - Creep 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. 2016-04-07T10:19:53Z 2016-04-07T10:19:53Z 1989 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18697 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering Turbomachines Materials - Creep Sieburg, H O Creep predictions for turbomachinery components |
| thesis_degree_str | Master's |
| title | Creep predictions for turbomachinery components |
| title_full | Creep predictions for turbomachinery components |
| title_fullStr | Creep predictions for turbomachinery components |
| title_full_unstemmed | Creep predictions for turbomachinery components |
| title_short | Creep predictions for turbomachinery components |
| title_sort | creep predictions for turbomachinery components |
| topic | Mechanical Engineering Turbomachines Materials - Creep |
| url | http://hdl.handle.net/11427/18697 |
| work_keys_str_mv | AT sieburgho creeppredictionsforturbomachinerycomponents |