PSI - Issue 75

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 75 (2025) 457–466

© 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 Among several parameters affecting the fatigue life of the welded joints, the size effect and weld quality are the main focus of the current study. Fatigue design technical documents consider the thickness effect by reducing the S-N curve for joints thicker than the reference thickness value. Yet, limited attention has been paid to the thinness effect, where the specimens gain life due to decreasing thickness. Understanding the connection between weld profile geometry and fatigue strength is also imperative for assessing welded joints against repeated loads, as geometrical irregularities lead to local stress raising and decrease fatigue life. In this study, several fatigue test series were performed on non-load carrying welded joints with 2- and 16-mm thicknesses under uniaxial constant amplitude loading, resulting in S-N curves to analyse the influence of thickness on fatigue strength. For each test specimen, the variation of weld shape along the weld seam is measured using a laser scanning tool. Assessment of fatigue test results and weld profile measured data helps better understand the uncertainty and variation in fatigue life and the relationship between fatigue strength with specimen thickness and the weld quality. The results indicate that there is a beneficial effect from reducing thickness and increased weld quality. © 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 Keywords: Welded joints; Fatigue; Weld quality;Thinness effect Fatigue Design 2025 (FatDes 2025) Experimental study on the influence of thinness effect and weld quality of non-load carrying welded joints Mehdi Ghanadi 1* , Miloslav Kepka Jr. 2 , Mattias Clarin 3 , Torbjörn Narström 1,4 ,Gustav Hultgren 1 , Zuheir Barsoum 1 1 KTH Royal Institute of Technology, Department of Engineering Mechanics, Division of Material and Structural Mechanics, SE-100 44 Stockholm, Sweden 2 University of West Bohemia, Faculty of Mechanical Engineering, Regional Technological Institute, Univerzitni 2732/8, 301 00, Pilsen, Czech Republic 3 SSAB Special Steels AB 781 84 Borlänge, Sweden 4 SSAB Special Steels AB 613 31 Oxelösund, Sweden

* Corresponding author. Tel.: +46-70-166 74 28 E-mail address: ghanadi@kth.se

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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper 10.1016/j.prostr.2025.11.046