Notch bluntness effects on fracture toughness of a modified S690 steel at 150 °C

J. S. Kim, N. O. Larrosa, A. J. Horn, Y. J. Kim, R. A. Ainsworth

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


This paper addresses the effect of blunt defects on the structural integrity assessment of steels. Smooth tensile, notched bar tensile and multi-specimen single edge notched bend tests with various notch acuities have been performed and show an increase in effective ductile fracture toughness with increasing notch radius. A ductile fracture model has been shown to be capable of predicting the specimen responses including the local variation of ductile crack extension through the thickness. An empirical fit developed to describe the effect of notch radius on cleavage fracture toughness has been examined and found to be also capable of describing the effect of notch radius on ductile fracture toughness.

Original languageEnglish
Pages (from-to)250-267
Number of pages18
JournalEngineering Fracture Mechanics
Publication statusPublished - 2018 Feb 1

Bibliographical note

Funding Information:
The release of ductile fracture data by Tata Steel through Mr Adam Bannister is gratefully acknowledged, as are helpful discussions with the members of the R6 Panel. The authors would like to acknowledge the funding and technical support from BP through the BP International Centre for Advanced Materials (BP-ICAM) which made this research possible. Appendix A

Publisher Copyright:
© 2017 Elsevier Ltd


  • Blunt notch
  • Defect assessment
  • Ductile fracture model
  • Effective fracture toughness
  • Failure assessment diagram

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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