Lifetime Prediction of Steam Turbine Components under Multiaxial Thermo-Mechanical Fatigue Loading

Abstract:

Lifetime prediction of steam turbine components under biaxial thermo-mechanical fatigue (TMF) loading of modern high chromium steel is prerequisite for design optimization. In this paper a phenomenological method which envelopes the synthesis of stress strain hysteresis loops and damage assessment under considering creep fatigue interaction is extended to multiaxial loadings. It is proposed as a post processing step depending on the results of a preceding finite element analysis based on a constitutive material model. Recalculation of biaxial service-type experiments on cruciform specimen of modern high chromium rotor steel 10CrMoWVNbN shows satisfactory results for lifetime estimation.

• Periodical: Applied Mechanics and Materials (Volume 151)
• Pages: 255-259
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.151.255
• Online since: January 2012
• Authors: Lu Cui, Peng Wang
• Keywords: 10CrMoWVNbN, Bi-Axial, Creep Fatigue, Cruciform Specimen, Lifetime, Service-Type, Thermo-Mechanical (TMF)

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