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Evaluation on Dependence of Ductile Crack Propagation Resistance on Crack Velocity

[+] Author Affiliations
Shuji Aihara, Kazuki Shibanuma, Yasuhito Imai

The University of Tokyo, Tokyo, Japan

Taishi Fujishiro, Takuya Hara

Nippon Steel Corporation, Kimitsu, Chiba, Japan

Paper No. IPC2012-90637, pp. 575-584; 10 pages
doi:10.1115/IPC2012-90637
From:
  • 2012 9th International Pipeline Conference
  • Volume 3: Materials and Joining
  • Calgary, Alberta, Canada, September 24–28, 2012
  • Conference Sponsors: International Petroleum Technology Institute, Pipeline Division
  • ISBN: 978-0-7918-4514-1
  • Copyright © 2012 by ASME

abstract

Plastic strains were measured near a propagating ductile crack in drop-weight tear tests (DWTT). Plastic work evaluated from the plastic strains agreed with crack propagation energy evaluated from dynamic load versus displacement curve. Furthermore, plastic strains were measured near a propagating ductile crack in a full-scale burst tested pipes. Plastic work of the burst pipe was found to be much larger than that of the DWTT. Values of the plastic work of the DWTT and the burst pipe were plotted against crack velocity to construct crack resistance curve. Reason to the increased crack resistance with crack velocity was understood as a dependence of plastic strain distribution on crack velocity by elasto-plastic dymanic finite element analysis.

Copyright © 2012 by ASME

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