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Ductile Fracture Resistance Modeling Approach in Two High Grade Steels

[+] Author Affiliations
L. N. Pussegoda, A. Fredj, A. Dinovitzer

BMT Fleet Technology Limited, Kanata, ON, Canada

D. Horsley

TransCanada PipeLines Limited, Calgary, AB, Canada

D. Carlson

Alliance Pipelines, Calgary, AB, Canada

Paper No. IPC2006-10114, pp. 131-139; 9 pages
doi:10.1115/IPC2006-10114
From:
  • 2006 International Pipeline Conference
  • Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B
  • Calgary, Alberta, Canada, September 25–29, 2006
  • Conference Sponsors: Pipeline Division
  • ISBN: 0-7918-4263-0
  • Copyright © 2006 by ASME

abstract

Recent developments in ductile fracture resistance measures in high grade steels in the pipeline industry include the crack tip opening angle (CTOA) and “steady state” fracture propagation energy, using 3-point bend specimens. The CTOA has been found to be a function of specimen ligament size. Alternatives would be “steady state” fracture propagation energy, critical fracture strain and adoption of damage mechanisms. This paper focuses on modeling approaches for crack propagation using damage mechanisms. The tension test is used to “calibrate” the damage model parameters and applied to the crack propagation in a 3-point bend specimen in candidate high grade steels. The effects of using parameters developed from tension test and extending to a 3-point bend crack propagation scenario is discussed.

Copyright © 2006 by ASME

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