PSI - Issue 75

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 75 (2025) 609–615

© 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 This study investigates the fatigue strength of arc-welded butt joints made of 316L austenitic stainless steel, the base material being additively manufactured (AMed) via Laser Powder Bed Fusion (LPBF). Two welded configurations are considered: (i) homogeneous, where two AMed parts were joined together, and (ii) dissimilar, where an AMed part was joined to a wrought (WR) part. First, a re-analysis of experimental fatigue data available in the literature was carried out using the nominal stress approach . The results show that the fatigue design curve suggested by Eurocode 3 for butt joints in steel provides conservative estimates, particularly in the high-cycle fatigue regime. Nevertheless, a mismatch emerges between the standard design curve and a best-fit fatigue curve derived from the experimental datasets. This deviation is primarily ascribed to the difference in slope between the Eurocode 3 curve (k = 3) and the experimental trend (k = 7.5), and it is consistent with previous findings on conventionally manufactured 316L joints, suggesting that the deviation is related to the material class rather than the manufacturing process. The results also highlight the need to refine existing fatigue design standards to accommodate the growing use of additive manufacturing in critical structural applications. © 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: fatigue strength; welded joints; austenitic stainless steel; dissimilar joint; additive manufacturing; Peak Stress Method Fatigue Design 2025 (FatDes 2025) Fatigue life assessment of dissimilar and homogeneous LPBF AISI 316 L butt welded joints Lucrezia Contiero a , Luca Vecchiato a , Alberto Campagnolo a , Vittorio Babini b and Giovanni Meneghetti a * a Department of Industrial Engineering, University of Padova, Via Venezia 1, Padova 35131, Italy b Antonio Zamperla S.p.a., Via Monte Grappa 15/17, Altavilla Vicentina 36007, Italy Abstract This study investigates the fatigue strength of arc-welded butt joints made of 316L austenitic stainless steel, the base material being additively manufactured (AMed) via Laser Powder Bed Fusion (LPBF). Two welded configurations are considered: (i) homogeneous, where two AMed parts were joined together, and (ii) dissimilar, where an AMed part was joined to a wrought (WR) part. First, a re-analysis of experimental fatigue data available in the literature was carried out using the nominal stress approach . The results show that the fatigue design curve suggested by Eurocode 3 for butt joints in steel provides conservative estimates, particularly in the high-cycle fatigue regime. Nevertheless, a mismatch emerges between the standard design curve and a best-fit fatigue curve derived from the experimental datasets. This deviation is primarily ascribed to the difference in slope between the Eurocode 3 curve (k = 3) and the experimental trend (k = 7.5), and it is consistent with previous findings on conventionally manufactured 316L joints, suggesting that the deviation is related to the material class rather than the manufacturing process. The results also highlight the need to refine existing fatigue design standards to accommodate the growing use of additive manufacturing in critical structural applications. © 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: fatigue strength; welded joints; austenitic stainless steel; dissimilar joint; additive manufacturing; Peak Stress Method Fatigue Design 2025 (FatDes 2025) Fatigue life assessment of dissimilar and homogeneous LPBF AISI 316 L butt welded joints Lucrezia Contiero a , Luca Vecchiato a , Alberto Campagnolo a , Vittorio Babini b and Giovanni Meneghetti a * a Department of Industrial Engineering, University of Padova, Via Venezia 1, Padova 35131, Italy b Antonio Zamperla S.p.a., Via Monte Grappa 15/17, Altavilla Vicentina 36007, Italy

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

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.2025.11.062