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Fracture Behavior of Finite Length Part Through Wall Flaws in Zirconium-Niobium Pressure Tubes

[+] Author Affiliations
Don R. Metzger

Atomic Energy of Canada Limited, Mississauga, ON, Canada

Gordon K. Shek, Ed T. C. Ho

Kinectrics, Inc., Toronto, ON, Canada

Paper No. PVP2006-ICPVT-11-93663, pp. 33-40; 8 pages
doi:10.1115/PVP2006-ICPVT-11-93663
From:
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 2: Computer Technology
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4753-5 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME

abstract

Flaws encountered in nuclear pressure tubes must be evaluated to ensure that a delayed hydride cracking (DHC) mechanism is not initiated where the stress concentration at a flaw tip causes diffusion of hydrogen and precipitation of zirconium hydride at the flaw tip. A fracture initiation model for DHC involves a process zone description for the interaction of hydride precipitation with the flaw tip stress distribution. Analytical techniques for this model are practical and accurate for two-dimensional geometry, but cannot be easily applied to the three-dimensional features of finite length surface flaws. Recently, a numerical rendition of the model has been incorporated into a finite element program so that arbitrary geometry and material properties can be managed. The three-dimensional finite length model is applied to specific flaw geometries used in an experimental program. Comparison with corresponding two-dimensional tests demonstrates that the finite length flaw has a significantly higher threshold load than that predicted on the basis of a two-dimensional model.

Copyright © 2006 by ASME

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