PSI - Issue 31

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 31 (2021) 70–74

4th International Conference on Structural Integrity and Durability, ICSID 2020 Finite element shape optimization of weld orientation in simple plate structure considering different fatigue estimation methods M.L. Larsen a, *, V. Arora a , H.B. Clausen b

a University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark b Ramboll Energy, Hannemanns Allé 53, 2300 Copenhagen, Denmark

© 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 ICSID 2020 Organizers. Abstract Dynamically loaded structures are generally in risk of fatigue damage. The fatigue lives of such structures can be improved using traditional methods like producing a better weld or using post-weld treatment. Another method is to improve the overall design of the structure by using the finite element method in combination with shape optimization. In this paper, a framework for finite element shape optimization has been developed, considering the fatigue life of welded joints. Simplicity and the possibility of including different fatigue estimation methods have been in focus for the framework. The framework has been used on a simple plate structure, where the weld orientation has been optimized based on four different fatigue criteria. The results show that the criteria from governing guidelines predict the same optimized weld orientation. However, the critical plane approaches cannot produce optimized weld orientations, when using the nominal stress approach as it does not account for increased stresses from the weld. © 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 ICSID 2020 Organizers. Keywords: FEM; shape optimization; welded joint, S-N fatigue;

1. Introduction Dynamically loaded structures are generally in risk of fatigue damage and fatigue failure. Welded joints are especially critical as the joint geometry leads to stress risers and as welds typically contain weld defects, which leads

* Corresponding author. Tel.: +45 6550 4067. E-mail address: mlla@sdu.dk

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 ICSID 2020 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 ICSID 2020 Organizers. 10.1016/j.prostr.2021.03.011