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

In: Thermal Power Plants - New Trends and Recent Developments

Author

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  • Mariusz Banaszkiewicz

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.

Suggested Citation

  • Mariusz Banaszkiewicz, 2018. "Numerical Modeling of Cyclic Creep-Fatigue Damage Development for Lifetime Assessment of Steam Turbine Components," Chapters, in: Pawel Madejski (ed.), Thermal Power Plants - New Trends and Recent Developments, IntechOpen.
    • Handle: RePEc:ito:pchaps:133737
    DOI: 10.5772/intechopen.73186
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    More about this item

    Keywords

    creep; low-cycle fatigue; steam turbine; lifetime assessment;
    All these keywords.

    JEL classification:

    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General

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