Application of critical distance approach for fatigue assessment of welded and HFMI-treated steel joints

Özler Karakaş*, Martin Leitner, Nail Tüzün

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


High Frequency Mechanical Impact (HFMI) treatment offers a great opportunity to enhance the lightweight potential of welded structures using high strength steel materials. Focusing on the IIW Recommendations for the HFMI Treatment, a fatigue assessment based on the nominal, structural as well as notch stress approach is considered. Due to its sound applicability and proper assessment of the fatigue strength, the critical distance approach acts as a valuable concept in fatigue design, which has not been broadly studied in terms of HFMI-treated weld joints. Therefore, this paper deals with the application of the critical distance approach for welded mild and high-strength steel joints in both as-welded and HFMI-treated condition. Critical distance values were determined as a = 0.1 mm for as-welded specimens and a = 0.2 mm for HFMI treated specimens but for the sake of reliability, a = 0.15 mm have been proposed for HFMI treated welded joints.

Original languageEnglish
Article number106534
JournalInternational Journal of Fatigue
Publication statusPublished - Jan 2022


  • Critical distance approach
  • Fatigue assessment
  • HFMI-treatment
  • Welded joints

ASJC Scopus subject areas

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


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