Local and structural multiaxial stress states in weldedjoints under fatigue loading |
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| Affiliation: | 1. Department of Mechanical Engineering, Trinity College, Dublin 2, Ireland;2. Department of Engineering, University of Ferrara, Via Saragat, 1-44100 Ferrara, Italy;1. Department of Mathematics, Faculty of Science, Texas A&M University at Qatar, Doha, Qatar;2. Department of Mathematics and Statistics, The University of Melbourne, Melbourne 3010 Vic, Australia;1. Department of Mechanical Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, S1 3JD Sheffield, United Kingdom;2. Escuela Técnica Superior de Ingenieros Industriales de Ciudad Real, Universidad de Castilla-La Mancha, Departamento de Mecánica Aplicada e Ingeniería de Proyectos, INEI Avenida Camilo José Cela s/n, 13071 Ciudad Real, Spain;1. Atkins Australasia Pty Ltd, Level 8, 50 St Geroges Terrace, Perth, WA, 6000, Australia;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Hwy, Crawley, WA, 6009, Australia;3. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;1. Centre of Expertise in Structural Mechanics, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia;2. IMT Institute for Advanced Studies Lucca, Piazza San Francesco 19, 55100 Lucca, Italy;3. Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy |
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| Abstract: | A cylindrical stiffener on a plate and a tube through a hollowed plate, both circularly welded, were tested under uniaxial fatigue loading. Their fatigue cracking behaviour was seen to be really complex due to the fact that crack initiation sites changed their position as the number of cycles to failure increased. To investigate this anomalous behaviour, an accurate numerical investigation was carried out to study the distribution of both local and structural linear elastic stresses along the weld toe circumferences. The numerical results proved that the weld beads were subjected to complex stress states, even though the applied nominal load was uniaxial. By the light of this evidence, the fatigue behaviour of the investigated welded joints was then re-interpreted from a multiaxial fatigue point of view by applying the Modified Wöhler Curve Method in terms of hot-spot stresses. The proposed approach was seen to be successful allowing us to estimate both crack initiation sites and fatigue lifetime with a high precision level. This fact is very interesting because it strongly supports the idea that our method can be used to assess real welded components subjected to multiaxial fatigue loading by simply post-processing linear-elastic finite-element results. |
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