Practical determination method of the threshold stress intensity factor range Δkth

Koji Murakami, Koji Gotoh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


It is necessary to identify relationship between the fatigue crack propagation rate and the stress intensity factor range, if the fracture mechanics approach is applied to evaluate the fatigue crack growth evolution. In addition, identification of the stress intensity factor range of fatigue crack growth threshold (ΔKth) is important to evaluate the structural integrity from the view of fatigue performance. ASTM standard E647 "Standard Test Method for Measurement of Fatigue Crack Growth Rates" is widely known as a de fact standard to determine the value of ΔKth. However, a considerably long time is required to perform the determination of ΔKth value. Therefore, it is expected to cut the experimental period for ΔKth determination. Efficient and time saving procedure for determining ΔKth value comparing with ASTM-E647 is proposed in this study. Many fatigue crack propagation test data were applied to verify the validity of our proposed method. It is expected to be able to complete the experiment for determining ΔKth value at a stage where the fatigue crack propagation rate is one order larger comparing with ASTM-E647.

Original languageEnglish
Pages (from-to)149-153
Number of pages5
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Issue number4
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys


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