PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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Procedia Structural Integrity 42 (2022) 1752–1761

© 2022 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 23 European Conference on Fracture – ECF23 B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 S355 steel is currently used in the fabric on of most wind turbine monopile supp rt structures and offshore structures. In these types of tructures, most fatigu failures occur n the welded connections where cyclic loading is the main responsible for this phenomenon. F r the high-cycle fatigue analysis, the stress lif method utilizing S-N curv s can be used to determine the strength of a w lded joint under fatigu loading. In this research, the evaluation of design S-N curv s for a double-side welded onn ction ma e of S355 steel is propos d. This stu y concludes w h a comparison between the experimental fatigue curves obtained and the de ig S-N curves at 5% and 2.3% pr bability failure proposed in design code (EN1993-1-9, DNVGL-RP-C203 standards and IIW recommendation ) for offshore structures a d general st el structur s. Fo th spe imens under investigati n, the hot-spot and nominal stress approache are ken into con ider tion. The characteristic fatigue curves of the double-side weld d connection are obtained using statistical analy es based on the ASTM E739, ISO 12107, Bayesian inference, and Weib ll distribution. The hot-spot and nominal stress approaches yield very similar S-N results considering the specimens under study. © 2020 The Authors. Published by E sevier B.V. This is an op n access ar icle unde the C BY-NC-ND lic nse (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 23 European Conference on Fracture - ECF23 Probabilistic fatigue strength modelling based on various statistical approaches for a double-side welded connection Paulo Mendes a, *, Rita Dantas a , José A.F.O Correia a , Nicholas Fantuzzi b , Abílio M.P Jesus a a CONSTRUCT & INEGI, Faculty of Engineering,, University of Porto, R. Dr. Roberto Frias, 4200-465, Porto, Portugal b DICAM Department, University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy S355 steel is currently used in the fabrication of most wind turbine monopile support structures and offshore structures. In these types of structures, most fatigue failures occur in the welded connections where cyclic loading is the main responsible for this phenomenon. For the high-cycle fatigue analysis, the stress life method utilizing S-N curves can be used to determine the strength of a welded joint under fatigue loading. In this research, the evaluation of design S-N curves for a double-side welded connection made of S355 steel is proposed. This study concludes with a comparison between the experimental fatigue curves obtained and the design S-N curves at 5% and 2.3% probability of failure proposed in design codes (EN1993-1-9, DNVGL-RP-C203 standards and IIW recommendations) for offshore structures and general steel structures. For the specimens under investigation, the hot-spot and nominal stress approaches are taken into consideration. The characteristic fatigue curves of the double-side welded connection are obtained using statistical analyses based on the ASTM E739, ISO 12107, Bayesian inference, and Weibull distribution. The hot-spot and nominal stress approaches yield very similar S-N results considering the specimens under study. 23 European Conference on Fracture - ECF23 Probabilistic fatigue strength modelling based on various statistical approaches for a double-side welded connection Paulo Mendes a, *, Rita Dantas a , José A.F.O Correia a , Nicholas Fantuzzi b , Abílio M.P Jesus a a CONSTRUCT & INEGI, Faculty of Engineering,, University of Porto, R. Dr. Roberto Frias, 4200-465, Porto, Portugal b DICAM Department, University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy Abstract Abstract © 2020 The Authors. Published by Elsevier

Keywords: S355 steel; S-N curve; Bayesian inference; Hot-spot stress; Nominal stress Keywords: S355 steel; S-N curve; Bayesian inference; Hot-spot stress; Nominal stress

* Corresponding author. Tel.: +351 22 508 3789 E-mail address: pjmendes@fe.up.pt * Corresponding author. Tel.: +351 22 508 3789 E-mail address: pjmendes@fe.up.pt

2452-3216 B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article nder the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) © 2020 The Authors. Published by Elsevier

Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.222