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Unique Fracture Behaviour of Multi-Perforated Media

[+] Author Affiliations
F. Billon, F. Taborda, J-O. Lesage

Onet Technologies, Marseille, France

Paper No. PVP2012-78532, pp. 427-432; 6 pages
doi:10.1115/PVP2012-78532
From:
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5502-7
  • Copyright © 2012 by ASME

abstract

Concerning the risk of fast fracture, multi-perforated tubesheets have a unique behavior. For the fracture analysis, it is assumed that a small ligament is fully cracked from the skin and that failure leads into the two holes on either side of this ligament in a square pitch. This approach is referred to as a “Broken Ligament Approach”, which can be analyzed using four main steps:

(a) Calculation of the elementary stresses in all the tubesheet using a global 3D Finite Element model,

(b) Conversion of the elementary stresses in membrane stresses and bending stresses along the thickness of the tubesheet at the location of the assumed broken ligament,

(c) Creation of a Representative Local Volume (RLV) containing the broken ligament to which boundary loads are applied to obtain the stresses defined in the global model,

(d) Calculation of the Stress Intensity Factor (SIF) along the crack front of the broken ligament with different depth of the crack.

The result is that the SIF passes through a maximum value as the depth of the broken ligament increases through the thickness of the tubesheet. It is thus possible to find an absolute maximum value of the SIF (called SIFam) over the tubesheet for its most severe loadings. Under these conditions, if the toughness of the tubesheet material is greater than SIFam, there is no risk of a fast fracture of the tubesheet. The existence of SIFam is a strong characteristic of the fracture behavior of multi-perforated media.

Copyright © 2012 by ASME

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