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Interaction of Twin Non-Aligned Through-Wall Flaws Under Elastic-Plastic Conditions

[+] Author Affiliations
B. Bezensek, E. McCulloch

University of Glasgow, Glasgow, UK

Paper No. PVP2006-ICPVT-11-93373, pp. 333-340; 8 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


Elastic-plastic calculations have been performed for the geometry containing twin non-aligned through-wall flaws in tension. Such geometries develop localised shear flow fields in which neighbouring flaws interact over much larger separations than currently allowed for in the codes [1–3] under elastic-plastic conditions. J values have been obtained in the annular zone spanning directions directly ahead of the crack, to the geometric angle which connects the two crack tips. It was found that elastic-plastic conditions give rise to a local mixed mode problem, where maximum J values rotate off the plane of the flaw, towards the neighbouring flaws. Interaction factors have been defined by comparing elastic-plastic stress intensity factors for twin flaw configuration with the values for the single flaw. A significant interaction has been observed for geometries with vertical separation less than the length of the flaw (H<L). Interaction based on the ratio of the local to global limit loads has also been examined and shows interaction up to the vertical separations of H=1.5L, largely independent of the horizontal separation.

Copyright © 2006 by ASME



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