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Determining critical CTOA from energy-load curves with DWTT specimen

Abstract

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 () is a promising parameter for characterizing crack arrest toughness. In this study, a new method is proposed to calculate the 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.

Category

Academic article

Language

English

Author(s)

  • Jian Shuai
  • Shengwen Tu
  • Junqiang Wang
  • Xiaobo Ren
  • Jianying He
  • Zhiliang Zhang

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Norwegian University of Science and Technology
  • China
  • China University of Petroleum, Beijing

Year

2017

Published in

Engineering Fracture Mechanics

ISSN

0013-7944

Volume

186

Page(s)

47 - 58

View this publication at Norwegian Research Information Repository