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Alignment Rules for Non-Aligned Flaws at LEFM Evaluation Procedures

[+] Author Affiliations
Kunio Hasegawa, Koichi Saito, Katsumasa Miyazaki

Hitachi, Ltd., Hitashi-shi, Ibaraki-ken, Japan

Paper No. PVP2006-ICPVT-11-93047, pp. 319-324; 6 pages
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 1: Codes and Standards
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4752-7 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME


If multiple discrete flaws are detected that are in close proximity to one another, alignment rules are used to determine whether the flaws should be treated as non-aligned or as coplanar. Alignment rules are defined in many codes in the world. However, the criteria of the alignment rules are different in these codes. This paper introduces the current alignment rules and, in addition, interaction of stress intensity factors for non-aligned through wall flaws were calculated by FEM analysis. Also, brittle fracture experiments were performed on carbon steel plates with non-aligned two flaws. From these calculations and experiments, authors had found the effect of stress intensity factor interaction on fracture behavior for establishing a new alignment rule.

Copyright © 2006 by ASME



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