PSI - Issue 75

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 75 (2025) 564–571

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper Abstract High-frequency-mechanical-impact (HFMI) is a post-weld treatment for improving the fatigue strength of welded structures, by introducing compressive residual stresses, localized strain hardening and enlarged weld toe radii. The Peak Stress Method (PSM) has been recently extended to the fatigue strength assessment of HFMI treated steel joints, by means of a dedicated analysis procedure and new fatigue design curves, calibrated on experimental data generated from HFMI treated joints tested under uniaxial loading with nominal load ratios R = 0.1 and 0.5. The results were taken from the literature and relevant to structural steels having yield stress in the range 355 ≤ σ y < 750 MPa. In the present work the applicability of the PSM to analyse HFMI treated welded joints has been extended by calibrating new PSM-based fatigue design curves on experimental results taken from the literature and generated from joints made of a high-strength steel having yield stress in the range 550 ≤ σ y < 750 MPa and tested by adopting nominal load ratios in the range 0 ≤ R ≤ 0.8. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2025 organizers Abstract High-frequency-mechanical-impact (HFMI) is a post-weld treatment for improving the fatigue strength of welded structures, by introducing compressive residual stresses, localized strain hardening and enlarged weld toe radii. The Peak Stress Method (PSM) has been recently extended to the fatigue strength assessment of HFMI treated steel joints, by means of a dedicated analysis procedure and new fatigue design curves, calibrated on experimental data generated from HFMI treated joints tested under uniaxial loading with nominal load ratios R = 0.1 and 0.5. The results were taken from the literature and relevant to structural steels having yield stress in the range 355 ≤ σ y < 750 MPa. In the present work the applicability of the PSM to analyse HFMI treated welded joints has been extended by calibrating new PSM-based fatigue design curves on experimental results taken from the literature and generated from joints made of a high-strength steel having yield stress in the range 550 ≤ σ y < 750 MPa and tested by adopting nominal load ratios in the range 0 ≤ R ≤ 0.8. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2025 organizers Fatigue Design 2025 (FatDes 2025) HFMI-treated welded structures: fatigue strength assessment Fatigue Design 2025 (FatDes 2025) HFMI-treated welded structures: fatigue strength assessment based on the Peak Stress Method Alberto Campagnolo a , Giovanni Meneghetti a* a Department of Industrial Engineering, University of Padova, via Venezia, 1 – 35131 Padova (Italy). based on the Peak Stress Method Alberto Campagnolo a , Giovanni Meneghetti a* a Department of Industrial Engineering, University of Padova, via Venezia, 1 – 35131 Padova (Italy).

Keywords: Welded joints; High-frequency mechanical impact (HFMI); Fatigue design; Peak Stress Method (PSM).

Keywords: Welded joints; High-frequency mechanical impact (HFMI); Fatigue design; Peak Stress Method (PSM).

* Corresponding author. Tel.: +39 049 8276751; fax: +39 049 8276785. E-mail address: giovanni.meneghetti@unipd.it

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2025 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2025 organizers * Corresponding author. Tel.: +39 049 8276751; fax: +39 049 8276785. E-mail address: giovanni.meneghetti@unipd.it

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper 10.1016/j.prostr.2025.11.057