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Measurement of the Strain Distribution in Notch Tip Hydrides With High Energy X-Ray Diffraction and the Impact on Overload Modeling

[+] Author Affiliations
Matthew Kerr

U.S. Nuclear Regulatory Commission, Washington, DC

Stephanie Tracy

Kinectrics Inc., Toronto, ON, Canada

Mark R. Daymond, Richard A. Holt

Queen’s University, Kingston, ON, Canada

Jonathon D. Almer

Argonne National Lab, Argonne, IL

Paper No. PVP2010-25161, pp. 71-80; 10 pages
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-49255 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME


The formation of notch-tip hydrides in CANDU® Zr-2.5Nb pressure tubes can significantly reduce their resistance to fracture, particularly during overload conditions. This paper outlines recent high energy X-ray diffraction measurements of notch tip strain fields in Zr-2.5Nb specimens, during both hydride growth and overload. The use of this data to validate continuum Finite Element (FE) and possible inclusion in ‘Process Zone’ models of hydride fracture are also discussed.

Copyright © 2010 by ASME



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