Numerical Modeling of Cyclic Creep-Fatigue Damage Development for Lifetime Assessment of Steam Turbine Components

Mariusz Banaszkiewicz

A chapter in Thermal Power Plants - New Trends and Recent Developments from IntechOpen

Abstract: The paper presents the results of numerical analysis of creep-fatigue damage development in a steam turbine rotor under cyclic duty. Investigations were performed for a full cycle representing the most accurate description of real operation and three simplified cycles representative of different levels of simplification in inelastic strains modeling. It was shown by numerical simulations that significant inaccuracies in creep-fatigue damage predictions, reaching an order of magnitude in deviation of inelastic strains, cannot be excluded when simplified models are used. It is thus concluded that full consideration of creep-fatigue damage at real operating conditions requires proper modeling of stress/strain histories using visco-elastic-plastic material models.

Keywords: creep; low-cycle fatigue; steam turbine; lifetime assessment (search for similar items in EconPapers)
JEL-codes: Q40 (search for similar items in EconPapers)
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Persistent link: https://EconPapers.repec.org/RePEc:ito:pchaps:133737

DOI: 10.5772/intechopen.73186

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