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Effects of Notch Acuity on Fracture Toughness Measurements

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

CanmetMATERIALS, Natural Resources Canada, Calgary, AB, Canada

Da-Ming Duan

TransCanada, Calgary, AB, Canada

Paper No. PVP2017-65177, pp. V06BT06A049; 8 pages
doi:10.1115/PVP2017-65177
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 6B: Materials and Fabrication
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5800-4
  • Copyright © 2017 by ASME and Her Majesty the Queen in Right of Canada

abstract

Effects of initial crack-tip acuity on toughness measurements has been evaluated through extensive small-scale toughness testing — single-edge notched tension and bend (SE(T) and SE(B)) — at room temperature using two X70 pipeline steels and girth welds. In order to investigate effects of different crack tip radii on toughness, some specimens were notched to the target initial crack size using electrical discharge machining (EDM), and no further fatigue precracking was made. On the other hand, other specimens were EDM-notched and then fatigue-precracked to the target crack size according to the current practice of ASTM E1820. The results show that effects of crack tip acuity on toughness measurement are significant especially at the crack-tip blunting stage. The EDM precrack increased toughness measurements by a factor of up to 1.6 and 2 for SE(B) and SE(T), respectively, at 0.2 mm of crack extension, compared to the fatigue precrack.

Copyright © 2017 by ASME and Her Majesty the Queen in Right of Canada

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