A1 Journal article (refereed), original research (Journal article, original research)

Comparison of local fatigue assessment methods for high-quality butt-welded joints made of high-strength steel

Open Access publication

Publication Details

Authors: Braun Moritz, Ahola Antti, Milaković Aleksandar-Saša, Ehlers Sören

Publication year: 2021

Language: English

Related journal or series: Forces in Mechanics

Volume number: 6

eISSN: 2666-3597

JUFO level of this publication: 0

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.finmec.2021.100056

Open Access: Open Access publication


Fatigue strength of welded joints is typically independent of the parent material static strength; however, there are two exceptions from this rule—post-weld treated joints and high-quality joints. The reason for both is the absence of sharp weld transitions. Thus, fatigue life is not fully governed by fatigue crack propagation but also by fatigue crack initiation. This is intensified by the fact that crack initiation behaviour is proportional to static strength properties. Commonly, this effect is not accounted for by design guidelines and typical fatigue assessment methods for welded joints. This study hence investigates the applicability and accuracy of different local fatigue assessment methods for high-quality welded joints made of high-strength steel. For this purpose, fatigue test results of S500 structural steel joints with weld toe and weld root failure are assessed using a variety of local approaches and then compared to the nominal stress approach. Finally, the transferability of results to large-scale structures are discussed and recommendations are given for practical applications.

Last updated on 2021-07-12 at 08:43