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Comparison of local fatigue assessment methods for high-quality butt-welded joints made of high-strength steel
Citation Link: https://doi.org/10.15480/882.4267
Publikationstyp
Journal Article
Publikationsdatum
2022-02
Sprache
English
Enthalten in
Volume
6
Article Number
100056
Citation
Forces in Mechanics 6: 100056 (2022-02)
Publisher DOI
Scopus ID
Publisher
Elsevier
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.
Schlagworte
4R method
Effective notch stress approach
Fatigue testing
Peak stress method
Stress averaging approach
Structural hot-spot stress approach
Theory of critical distances
DDC Class
600: Technik
Publication version
publishedVersion
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