Evaluation of creep crack growth properties using circular notched specimens

Masaaki Tabuchi, Takeshi Adachi, A. Toshimitsu Yokobori, Akio Fuji, Jechang Ha, Takeo Yokobori

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


It is important to evaluate the effect of multiaxial stress conditions on initiation and growth of creep cracks, when the laboratory data are subsequently applied to structural components under the same or similar stress state. The round robin tests of creep crack growth using circular notched specimens of 1CrMoV steel at 538 and 594 °C and l2CrWCoB steel at 650 °C were conducted by the Japanese VAMAS TWA25 group. The effect of notch depth and specimen size, i.e. stress multiaxiality on crack growth properties was investigated. The test procedure including criteria for crack length measurement by electric potential drop was established. The circular notched specimens fractured intergranularly and showed different crack growth behaviour from that of a CT specimen due to the multiaxial stress field. The creep crack growth rate for the same C* value increased as the ratio of the notch depth to specimen diameter, i.e. stress multiaxiality increased. The Q* evaluation method based on the thermally activated process can also be applied to the circular notched specimen.

Original languageEnglish
Pages (from-to)417-425
Number of pages9
JournalInternational Journal of Pressure Vessels and Piping
Issue number7-8
Publication statusPublished - 2003 Sep 1
Externally publishedYes


  • C parameter
  • Circular notched specimen
  • Creep crack growth
  • Multiaxial stress condition
  • Round robin test
  • Thermal activated process

ASJC Scopus subject areas

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


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