Title: Low cycle fatigue analysis of a last stage steam turbine blade
Authors: Měšťánek, Petr
Citation: Applied and Computational Mechanics. 2008, vol. 2, no. 1, p. 71-82.
Issue Date: 2008
Publisher: University of West Bohemia
Document type: článek
URI: http://www.kme.zcu.cz/acm/old_acm/full_papers/acm_vol2no1_p008.pdf
ISSN: 1802-680X (Print)
2336-1182 (Online)
Keywords: zkoušení materiálu;únava materiálu;parní turbíny;výpočetní metody ve fyzice
Keywords in different language: material testing;fatigue of material;steam turbines;computational methods in physics
Abstract: 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.
Rights: © 2008 University of West Bohemia. All rights reserved.
Appears in Collections:Volume 2, number 1 (2008)
Články / Articles (KME)
Volume 2, number 1 (2008)

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