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A Comparative Study of a Single Damage-Parameter Life Prediction Method and a Physically-Based Damage Mechanics Method

[+] Author Affiliations
S. B. Leen, T. H. Hyde, S. Peravali, W. Sun

University of Nottingham, Nottingham, UK

Paper No. PVP2008-61386, pp. 1195-1200; 6 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


This paper presents a comparison between the life predictions from a physically-based damage mechanics formulation, which captures the fracture mechanism of intergranular cavitation, via three state variables, describing intergranular creep cavitation, coarsening of carbide precipitates and primary creep softening, and a corresponding single-damage mechanics formulation, of the Kachanov-type. The comparison is made for a 0.5Cr0.5Mo0.25V ferritic steel at a temperature of 635°C across a range of stress levels on the basis of a notched bar stress-state. Simplified predictions based on the R5 reference stress method are also given for comparative purposes.

Copyright © 2008 by ASME



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