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Rules on Transforming Embedded Flaws to Surface Flaws

[+] Author Affiliations
Kunio Hasegawa, Masaaki Kikuchi

Japan Nuclear Safety Organization, Tokyo, Japan

Paper No. PVP2008-61007, pp. 215-220; 6 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4824-1 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME


If embedded flaws are located near the component surfaces, proximity rules are used to determine whether the flaws should be treated as embedded flaws as is, or transformed to surface flaws. This is because failures at ligaments are expected to occur for embedded flaws. The proximity rules are widely adopted in fitness-for-service codes and standards. This paper introduces the proximity rules in the world, and stress intensity factors for embedded and transformed surface flaws are calculated and compared among the proximity rules.

Copyright © 2008 by ASME



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