Effect of load stress ratio on nominal and effective notch fatigue strength assessment of HFMI-treated high-strength steel cover plates

Martin Leitner, Michael Stoschka

Research output: Contribution to journalArticlepeer-review


The International Institute of Welding published IIW-recommendations for the HFMI-treatment, which covers fatigue assessment procedures and quality assurances guidelines. This paper contributes to the validation of the detrimental effect of high R-ratios on HFMI-treated cover plate specimens made of high-strength steel S700. Applying the nominal stress approach, the recommended S/N-curves agree well to the experiments in both cases, R = 0.1 and R = 0.5. In case of the effective notch stress approach, only for R = 0.1 a sound agreement is observed, whereas for R = 0.5 a more pronounced reduction of the fatigue strength may be considered within the recommendations to ensure an overall conservative assessment
Original languageEnglish
Article number105784
JournalInternational Journal of Fatigue
Issue numberOctober
Publication statusPublished - Oct 2020
Externally publishedYes


  • Fatigue strength assessment
  • HFMI-treatment
  • High-strength steel
  • Welded joints

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)
  • Industrial and Manufacturing Engineering
  • Modelling and Simulation

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