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Reference Stress Based Assessment for Creep-Fatigue Life Under Multiaxial Condition

[+] Author Affiliations
Kenji Tokuda, Kimiaki Yoshida, Masataka Yatomi

IHI Corporation, Yokohama, Kanagawa, Japan

Paper No. PVP2014-28274, pp. V06AT06A034; 8 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


The reference stress method has been developed to assess the service life for many components under creep condition. However, in order to use the reference stress as a representative stress to assess the creep fatigue life, some modifications are needed. The σd approach based on reference stress, used in RCC-MR, is one of the most common method to assess creep fatigue crack incubation. The aim of this paper is to develop a novel model based on reference stress and the σd approach to estimate the life subjected to creep-fatigue interaction under multiaxial condition for defect free structures. Three kinds of circumferentially notched bar specimens were used in order to examine the creep-fatigue interaction under multiaxial conditions. Finite element analyses were conducted to develop a simplified life assessment method and to calculate the creep fatigue damage in the test specimens. The predicted creep fatigue lives are in good agreement with the experimental results using notched bar specimens of 316H stainless steel.

Copyright © 2014 by ASME
Topics: Creep , Fatigue , Stress



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