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) 75–79

© 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 Fatigue assessment of welded joints is vital for accurately designing and predicting lifetime of many engineering structures. Assessing weld fatigue is challenging due to the high variability in weld quality and geometry because of the volatile nature of the joining method and further challenges arise when assessing multiaxial fatigue. In this paper, two approaches, the Findley criterion and Modified Wöhler Curve Method, on several multiaxial experimental data sets of welded joints are compared to predict the fatigue life of the welded joints. Six experimental sets from literature are tested under a proportional torsion/bending multiaxial load. The notch stress method is used for calculating stresses at the toes of a 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; welded joint; S-N fatigue; Critical plane approach; Findley; MWCM 1. Introduction The study of fatigue failure has a long history, dating back to the nineteenth century where the likes of August Wöhler and Sir William Fairbarn pioneered some of the first research in the field. Since then, fatigue failure analysis has been explored in great depth, especially in the case of uniaxial fatigue, which provides reliable results in most cases. Unfortunately, uniaxial fatigue rarely occurs in engineering structures. Often loads act in multiple directions and can be chaotic in nature, causing variable amplitudes and phase shifts between the loads. Thus, for the past century, Th 4th International Conference on Structural Integrity and Durability, ICSID 2020 Comparison of Findley and MWCM multiaxial fatigue methods using the notch stress method on welded joints N. D. Bibbo a,b, *, V. Arora a , M. M. Pedersen c a University of Southern Denmark, Department of Technology and Innovation, Campusvej 55, 5230 Odense, Denmark b Lindø Offshore Renewables Center, Lindø Sydvej 30, 5330 Munkebo, Denmark c Aarhus University School of Engineering, Inge Lehmanns Gade 10, 8000 Aarhus C, Denmark

* Corresponding author. Tel.: +45 3148 9907. E-mail address: NDBI@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.2021.03.012