PSI - Issue 75

Gary B. Marquis et al. / Procedia Structural Integrity 75 (2025) 530–537 Marquis, Barsoum & Leitner / Structural Integrity Procedia (2025)

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progress, several areas remain open for future research and development. Current guidelines are validated for structural steels with yield strengths up to 1300 MPa; however, ongoing material innovations demand experimental validation for ultra-high-strength steels beyond this range. Similarly, while general guidance exists for corrosion protection, extended studies on long-term performance in aggressive or marine environments are needed to better quantify the durability of treated joints and to optimize coating strategies. Advanced computational modeling of the HFMI process—capturing local plasticity, residual stress evolution, and multiaxial loading effects, also offers promising avenues for refining design and predictive fatigue life assessments. As HFMI continues to evolve, collaborative efforts among academia, industry, and standards organizations will be essential in broadening its application scope, ensuring safe use in new environments, and unlocking further weight and cost savings through optimized fatigue design. References 1. Marquis, G.B., Barsoum, Z. (2016). IIW Recommendations on High Frequency Mechanical Impact (HFMI) Treatment for Improving the Fatigue Strength of Welded Joints. In: IIW Recommendations for the HFMI Treatment. IIW Collection. Springer, Singapore. ISBN 978-981-10-2504-4. 2. prEN 1993-1-9, Eurocode 3 - Design of Steel Structures - Part 1.9: Fatigue, Draft, European Committee for Standardization, 2020. 3. Marquis, G.B., Barsoum, Z. & Leitner, M. New developments and guideline updates for HFMI treatment for improving the fatigue strength of welded joints. Weld World (2025). https://doi.org/10.1007/s40194 024-01882-7 4. Marquis, G.B., Barsoum, Z. & Leitner, M., IIW Recommendations on HFMI Treatment for Improving the Fatigue Strength of Welded Joints, 2nd edition, IIW Document XIII-3031-2024. 5. M. Leitner, and Z. Barsoum, Effect of increased yield strength, R-ratio, and plate thickness on the fatigue resistance of high-frequency mechanical impact (HFMI)–treated steel joints, Weld World (2020) 64:1245 1259, DOI 10.1007/s40194-020-00914-2 6. Yıldırım, H. C., Leitner, M., Marquis, G. B., Stoschka, M. and Barsoum, Z., Application studies for fatigue strength improvement of welded structures by high-frequency mechanical impact (HFMI) treatment, Engineering Structures, Volume 106, 1 January 2016, Pages 422–435 7. Yıldırım, H.C., Recent results on fatigue strength improvement of high -strength steel welded joints, Int. J Fatigue, V. 101, Part 2, 2017, DOI 10.1016/j.ijfatigue.2016.10.026. 8. ISO 5817:2023; Welding – Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) – Quality levels for imperfections, 2023. 9. Hobbacher A.F., Baumgartner J. (2024), Recommendations for Fatigue Design of Welded Joints and Components, 3 rd Edition, IIW Collection Springer, ISBN 978-3-031-57667-6. 10. Miki C. (2025), Retrofitting Engineering for Fatigue Damaged Steel Structures, IIW Collection Springer, ISBN 978-3-031-80146-4.