Journal
ENGINEERING FRACTURE MECHANICS
Volume 186, Issue -, Pages 47-58Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2017.09.012
Keywords
Critical CTOA; DWTT test; Pipeline; Ductile fracture; Fracture toughness
Categories
Funding
- National Twelfth Five-Year Plan for Science & Technology Support [2015BAK16B02]
- Chinese Scholarship council
- Research Council of Norway through Petromaks 2 Programme [228513/E30]
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Running ductile fracture is one of the most catastrophic accidents of pipelines for natural gas transportation. Crack arrest toughness is important for preventing crack extension to a long distance along pipeline. Critical crack tip opening angle (CTOA(C)) is a promising parameter for characterizing crack arrest toughness. In this study, a new method is proposed to calculate the CTOA(C) from the energy-load curves in an instrumented drop weight tearing test (DWTT). Numerical analyses with the Gurson damage model have been conducted to verify the proposed method. It shows that results calculated from the energy-load curves are slightly lower than the results measured from specimen surface. Results calculated from the proposed method also agree well with experimental results reported in the literature. (C) 2017 Elsevier Ltd. All rights reserved.
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