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Relationship of Fracture Behaviours Between Full-Scale Pipe Bending and Small-Scale Toughness Tests

[+] Author Affiliations
Dong-Yeob Park, Jean-Philippe Gravel

CanmetMATERIALS, Calgary, AB, Canada

Hisakazu Tajika, Takahiro Sakimoto

JFE Steel Corporation, Chiba, Japan

Satoshi Igi

JFE Steel Corporation, Kurashiki, Japan

James A. Gianetto, Jie Liang

CanmetMATERIALS, Hamilton, ON, Canada

Joe Kondo

JFE Steel Corporation, Tokyo, Japan

Paper No. PVP2018-84138, pp. V06BT06A050; 8 pages
  • ASME 2018 Pressure Vessels and Piping Conference
  • Volume 6B: Materials and Fabrication
  • Prague, Czech Republic, July 15–20, 2018
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5168-5
  • Copyright © 2018 by ASME and Her Majesty the Queen in Right of Canada


A comparison of the fracture behaviours for a full-scale (FS) pipe bending test and small-scale fracture toughness tests was carried out in this investigation. For the FS pipe test, two 4-meter long large diameter (914 mm) X70 pipes were girth-welded together to facilitate bend testing with an internal pressure of 72% of specified miniminm yield strength (SMYS). The test assembly also contained a semi-ellipical notch that was prepared by means of electrical discharge machining (EDM) from the outside surface in the heat-affected zone. Single-edge notched bend (SE(B) or SENB) and single-edge notched tension (SE(T) or SENT) test specimens were prepared from a duplicate girth weld produced with the same pipe and weld procedure with equivalent notch depths. The FS pipe test showed deformation along the pipe axis asymmetric to the girth weld centre. The comparison of fracture behaviours between small-scale and FS tests suggests that toughness measurements (crack-tip opening displacement or J-integral) at maximum load might be useful as a reference for strain-based design although further work is needed.

Copyright © 2018 by ASME and Her Majesty the Queen in Right of Canada



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