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Modeling and Simulation of Creep Crack Growth in High Chromium Steels

[+] Author Affiliations
Nicola Bonora, Simone Dichiaro

University of Cassino and Southern Lazio, Cassino, Italy

Luca Esposito

TECHDYN Engineering, Rome, ItalyUniversity of Cassino and Southern Lazio, Rome, Italy

Paolo Folgarait

Allied International Srl, Nibbiano Val Tidone, Italy

Paper No. PVP2014-28021, pp. V06AT06A031; 6 pages
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4603-2
  • Copyright © 2014 by ASME


Safe and accurate methods to predict creep crack growth (CCG) are required in order to assess the reliability of power generation plants components. With advances in finite element (FE) methods, more complex models incorporating damage can be applied in the study of CCG where simple analytical solutions or approximate methods are no longer applicable. The possibility to accurately simulate CCG depends not only on the damage formulation but also on the creep model since stress relaxation, occurring in the near tip region, controls the resulting creep rate and, therefore, crack initiation and growth. In this perspective, primary and tertiary creep regimes, usually neglected in simplified creep models, plays a relevant role and need to be taken into account. In this paper, an advanced multiaxial creep model [1], which incorporates damage effects, has been used to predict CCG in P91 high chromium steel. The model parameters have been determined based on uniaxial and multiaxial (round notched bar) creep data over a wide range of stress and temperature. Successively, the creep crack growth in standard compact tension sample was predicted and compared with available experimental data.

Copyright © 2014 by ASME



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