期刊
WELDING IN THE WORLD
卷 59, 期 5, 页码 731-742出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s40194-015-0248-x
关键词
Notch effect; Fatigue strength; Finite element analysis; Elastic analysis
资金
- Federal Ministry of Economics and Technology (BMWi) via the Federation of Industrial Research Associations (Arbeitsgemeinschaft industrieller Forschungsvereinigungen Otto von Guericke e.V. = AiF e.V.) [16.431]
This paper comprises a brief methodical analysis and practical application of both the stress averaging approach according to Neuber and the critical distance approach according to Taylor for a fatigue assessment on welded steel structures under axial loading. The stress averaging approach, as established theoretically by Neuber, is discussed and compared to the effective notch stress approach with a reference radius r(ref)=1 mm and also to the r(ref)=0.05 mm concept which is usually applied for thin-walled structures. Furthermore, both approaches are applied for an assessment of 38 individual test series. As a result of the evaluations, a microstructural length rho*=0.40 mm is recommended. For the critical distance approach, a distance a=0.10 mm was derived. Fatigue design ( FAT) values are recommended for the practical application. Compared to the notch stress approach with a radius r(ref)=0.05 mm, it was possible to improve the assessment quality significantly. The non-local approaches should be preferred to the r(ref)=0.05 mm concept, especially for welded components using thin sheets for which the radius of 1 mm cannot be applied.
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