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Fracture Integrity Assessment of Flawed Bi-Metallic Girth Weld Joint

[+] Author Affiliations
Nicola Bonora, Andrew Ruggiero

University of Cassino and Southern Lazio, Cassino, Italy

Antonio Carlucci

SAIPEM SA, Montigny-le-Bretonneux, France

Gianluca Iannitti

Techdyn Engineering, Rome, Italy

Paper No. PVP2013-97276, pp. V003T03A049; 5 pages
  • ASME 2013 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Paris, France, July 14–18, 2013
  • Conference Sponsors: Pressure Vessels and Piping Division, Nondestructive Evaluation Engineering Division
  • ISBN: 978-0-7918-5567-6
  • Copyright © 2013 by ASME


The objective of the work is to establish, for a bi-metallic girth weld joint, up to which level of remote stress/strain is still conservative the use of the standard approach to perform an Engineering Criticality Assessment (ECA) considering the joint made of a single equivalent material. Several flaw types located at the interfaces between the joint materials were considered. Extensive finite element analysis was performed to derive the crack driving force using domain integral method. The possibility to use, with appropriate meshing, the CTOD as parameters to directly derive the J-integral in the numerical simulation is also demonstrated. Computational results indicate that the use of a material curve, obtained as the lower bound of all joint materials curves, lead to conservative results.

Copyright © 2013 by ASME



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