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Publisher DOI: 10.1111/ffe.13232
Title: Requirements for stress gradient-based fatigue assessment of notched structures according to theory of critical distance
Language: English
Authors: Braun, Moritz  
Müller, André Mischa 
Milaković, Aleksandar-Saša 
Fricke, Wolfgang 
Ehlers, Sören 
Keywords: critical distance;fatigue at notches;finite element analysis;notch fatigue analysis;notch sensitivity;stress gradient
Issue Date: 16-Apr-2020
Publisher: Wiley-Blackwell
Source: Fatigue and Fracture of Engineering Materials and Structures 7 (43): 1541-1554 (2020)
Journal or Series Name: Fatigue & fracture of engineering materials & structures 
Abstract (english): Notches, local stress raisers within structural components, are one of the most important locations for fatigue crack initiation. It is well known that fatigue is governed by the effective stresses in the vicinity of notches. Within this study, differences in prediction accuracy between different types of theory of critical distance methods, that is, point and line methods, are systematically investigated in conjunction with a sensitivity study regarding mesh refinement, assumed strength hypothesis and material behaviour. For this purpose, a finite element analysis parameter study on notched structures is performed and recommendations for the application of stress gradient methods are presented. Difference in effective stress of up to 30%, and hence a significant difference in fatigue life (e.g., 185% for a slope of S-N curve of k = 4), is found for typical notch shapes, for example, in welded joints.
DOI: 10.15480/882.2795
ISSN: 1460-2695
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Type: (wissenschaftlicher) Artikel
Funded by: The work was performed within the research project ESM-50 ‘Fatigue of welded structures at sub-zero temperatures’, funded by the German Research Association of the Working Group of the Iron- and Metal-processing Industry e.V. as part of the Donors' Association for the Promotion of Sciences and Humanities in Germany under project number AVIF-No. A301.
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