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Unresolved Issues With Regard to Creep and Creep Fatigue Life Prediction

[+] Author Affiliations
J. Oh, N. Katsube

Ohio State University, Columbus, OH

F. W. Brust

Battelle, Columbus, OH

Paper No. PVP2002-1190, pp. 3-15; 13 pages
doi:10.1115/PVP2002-1190
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • New and Emerging Computational Methods: Applications to Fracture, Damage, and Reliability
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1949-3
  • Copyright © 2002 by ASME

abstract

This paper studies intergranular creep failure of high temperature service material under a stress-controlled unbalanced cyclic loading condition. The grain boundary rupture process was numerically analyzed using Tvergaard’s axisymetric model. The present numerical model incorporated the experimentally verified Murakami-Ohno cyclic strain hardening creep law and Norton’s creep law. The numerical results show that void growth accelerates under cyclic loading condition. Also, analysis shows that a steady state creep law is not sufficient to analyze damage evolution under cyclic loading conditions.

Copyright © 2002 by ASME
Topics: Creep , Fatigue life

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