PSI - Issue 38

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 38 (2022) 372–381

© 2021 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 2021 Organizers © 2021 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 2021 Organizers Abstract One of th sustainable developm nt goals of the Green Deal established by the Europe Union is th de nd of affordable and clean energy. Among the r n wable energies, th wind energy is already crucial i reaching the ambitiou goals and will become even more imp rtant in the futur . Since conomic aspects will ga more importance, an efficient use of materials nd resources is essential, especially those related to the fatigue d sign and service life prediction wind turb ne towers made of steel. Th s paper introduces an advanced fatigue ssessment ethod, using the strain-lif approach and the crack propagation method, named Two Stag Model. This model combine the two phenom nological aspects of c ack initiation and propagati for a more reliable fatigue service life prognos s compared to commonly applied and simplified methods. By i vest gating both parts of the Two S age Model separately, the paper shows the effect of selected input parameters on the service life for constant stress amplitudes. A Monte-Carlo Simulation is applied to validate the Two Stage Model as a vulnerable and reliable fatigue assessment concept. © 2021 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 2021 Organizers FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Advanced fatigue assessment - the future of wind turbine towers Hendrik Bissing a *, Markus Knobloch a , Marion Rauch b a Ruhr-Universität Bochum, Chair of Steel, Lightweight and Composite Structures, Bochum, Germany b Hochschule Kaiserslautern – University of Applied Sciences, Professor for Steel and Timber Structures, Kaiserslautern, Germany Abstract One of the sustainable development goals of the Green Deal established by the European Union is the demand of affordable and clean energy. Among the renewable energies, the wind energy is already crucial in reaching the ambitious goals and will become even more important in the future. Since economic aspects will gain more importance, an efficient use of materials and resources is essential, especially those related to the fatigue design and service life prediction of wind turbine towers made of steel. This paper introduces an advanced fatigue assessment method, using the strain-life approach and the crack propagation method, named Two Stage Model. This model combines the two phenomenological aspects of crack initiation and propagation for a more reliable fatigue service life prognosis compared to commonly applied and simplified methods. By investigating both parts of the Two Stage Model separately, the paper shows the effect of selected input parameters on the service life for constant stress amplitudes. A Monte-Carlo Simulation is applied to validate the Two Stage Model as a vulnerable and reliable fatigue assessment concept. FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Advanced fatigue assessment - the future of wind turbine towers Hendrik Bissing a *, Markus Knobloch a , Marion Rauch b a Ruhr-Universität Bochum, Chair of Steel, Lightweight and Composite Structures, Bochum, Germany b Hochschule Kaiserslautern – University of Applied Sciences, Professor for Steel and Timber Structures, Kaiserslautern, Germany

Keywords: advanced fatigue assessment; wind turbines; steel towers

Keywords: advanced fatigue assessment; wind turbines; steel towers

* Corresponding author. Tel.: +49 (0)234 32-29737; fax: +49 (0)234 32-14616. E-mail address: hendrik.bissing@ruhr-uni-bochum.de

2452-3216 © 2021 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 2021 Organizers 2452-3216 © 2021 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 2021 Organizers * Corresponding author. Tel.: +49 (0)234 32-29737; fax: +49 (0)234 32-14616. E-mail address: hendrik.bissing@ruhr-uni-bochum.de

2452-3216 © 2021 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 2021 Organizers 10.1016/j.prostr.2022.03.038