Low cycle fatigue analysis of a last stage steam turbine blade
The present paper deals with the low cycle fatigue analysis of the low pressure (LP) steam turbine blade. The blade is cyclically loaded by the centrifugal force because of the repeated startups of the turbine. The goal of the research is to develop a technique to assess fatigue life of the blade an...
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| Format: | Article |
| Language: | English |
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University of West Bohemia
2008-11-01
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| Series: | Applied and Computational Mechanics |
| Subjects: | |
| Online Access: | http://www.kme.zcu.cz/acm/old_acm/full_papers/acm_vol2no1_p008.pdf |
| _version_ | 1819125726677303296 |
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| author | Měšťánek P. |
| author_facet | Měšťánek P. |
| author_sort | Měšťánek P. |
| collection | DOAJ |
| description | The present paper deals with the low cycle fatigue analysis of the low pressure (LP) steam turbine blade. The blade is cyclically loaded by the centrifugal force because of the repeated startups of the turbine. The goal of the research is to develop a technique to assess fatigue life of the blade and to determine the number of startups to the crack initiation. Two approaches were employed. First approach is based on the elastic finite element analysis. Fictive 'elastic' results are recalculated using Neuber's rule and the equivalent energy method. Triaxial state of stress is reduced using von Mises theory. Strain amplitude is calculated employing the cyclic deformation curve. Second approach is based on elastic-plastic FE analysis. Strain amplitude is determined directly from the FE analysis by reducing the triaxial state of strain. Fatigue life was assessed using uniaxial damage parameters. Both approaches are compared and their applicability is discussed. Factors that can influence the fatigue life are introduced. Experimental low cycle fatigue testing is shortly described. |
| first_indexed | 2024-12-22T07:44:43Z |
| format | Article |
| id | doaj.art-2635b8f5849e493a838403416c125813 |
| institution | Directory Open Access Journal |
| issn | 1802-680X |
| language | English |
| last_indexed | 2024-12-22T07:44:43Z |
| publishDate | 2008-11-01 |
| publisher | University of West Bohemia |
| record_format | Article |
| series | Applied and Computational Mechanics |
| spelling | doaj.art-2635b8f5849e493a838403416c1258132022-12-21T18:33:40ZengUniversity of West BohemiaApplied and Computational Mechanics1802-680X2008-11-01217182Low cycle fatigue analysis of a last stage steam turbine bladeMěšťánek P.The present paper deals with the low cycle fatigue analysis of the low pressure (LP) steam turbine blade. The blade is cyclically loaded by the centrifugal force because of the repeated startups of the turbine. The goal of the research is to develop a technique to assess fatigue life of the blade and to determine the number of startups to the crack initiation. Two approaches were employed. First approach is based on the elastic finite element analysis. Fictive 'elastic' results are recalculated using Neuber's rule and the equivalent energy method. Triaxial state of stress is reduced using von Mises theory. Strain amplitude is calculated employing the cyclic deformation curve. Second approach is based on elastic-plastic FE analysis. Strain amplitude is determined directly from the FE analysis by reducing the triaxial state of strain. Fatigue life was assessed using uniaxial damage parameters. Both approaches are compared and their applicability is discussed. Factors that can influence the fatigue life are introduced. Experimental low cycle fatigue testing is shortly described.http://www.kme.zcu.cz/acm/old_acm/full_papers/acm_vol2no1_p008.pdfLow cycle fatigueUniaxial damage parametersLP bladeSteam turbineNeuber's ruleEquivalent strain amplitudeExperimental LCF testing |
| spellingShingle | Měšťánek P. Low cycle fatigue analysis of a last stage steam turbine blade Applied and Computational Mechanics Low cycle fatigue Uniaxial damage parameters LP blade Steam turbine Neuber's rule Equivalent strain amplitude Experimental LCF testing |
| title | Low cycle fatigue analysis of a last stage steam turbine blade |
| title_full | Low cycle fatigue analysis of a last stage steam turbine blade |
| title_fullStr | Low cycle fatigue analysis of a last stage steam turbine blade |
| title_full_unstemmed | Low cycle fatigue analysis of a last stage steam turbine blade |
| title_short | Low cycle fatigue analysis of a last stage steam turbine blade |
| title_sort | low cycle fatigue analysis of a last stage steam turbine blade |
| topic | Low cycle fatigue Uniaxial damage parameters LP blade Steam turbine Neuber's rule Equivalent strain amplitude Experimental LCF testing |
| url | http://www.kme.zcu.cz/acm/old_acm/full_papers/acm_vol2no1_p008.pdf |
| work_keys_str_mv | AT mestanekp lowcyclefatigueanalysisofalaststagesteamturbineblade |