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A Framework of Integrated Creep-Fatigue Modeling

[+] Author Affiliations
X. Wu, S. Yandt, Z. Zhang

NRC Canada, IAR-SMPL, Ottawa, ON, Canada

Paper No. GT2009-59087, pp. 731-736; 6 pages
doi:10.1115/GT2009-59087
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4885-2 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by National Research Council of Canada

abstract

A framework of integrated creep-fatigue (ICF) modeling is proposed based on the deformation decomposition rule that the total inelastic strain (in a polycrystalline material) consists of intragranular deformation (ID) and grain boundary sliding (GBS). With consideration of the respective deformation mechanisms, the resulting constitutive laws are given in 3D tensor forms such that fatigue damage (ID) and creep damage (GBS) are represented in different strain spaces, respectively. Then, the creep-fatigue life consumption can be evaluated using a physics-based formula that captures the intricate interaction between a propagating fatigue crack and distributed creep damage, leading to final fracture.

Copyright © 2009 by National Research Council of Canada
Topics: Creep , Fatigue , Modeling

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