Fatigue design of complex welded structures |
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| Authors: | B Atzori P Lazzarin G Meneghetti M Ricotta |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Padova, Via Venezia, 1, 35131 Padova, Italy;2. Department of Management and Engineering, University of Padova, Stradella San Nicola, 3, 36100 Vicenza, Italy;1. Department of Engineering University of Ferrara, Italy;2. Department of Aeronautics Imperial College, London;3. Department of Engineering University of Ferrara, Italy;4. Department of Engineering University of Ferrara, Italy;1. ISAE-ENSMA – UPR CNRS 3346, Institut Pprime, Département Physique et Mécanique des Matériaux, Téléport 2, Avenue Clément Ader, BP 40 109, 86961 Futuroscope, France;2. MATEIS, INSA Lyon/Université de Lyon/CNRS, F-69621 Villeurbanne Cedex, France;3. CTIF, 44 avenue de la Division Leclerc, F-92318 Sevres Cedex, France;1. Mechanical Engineering Department, Engineering Faculty, Pamukkale University, 20070 Kinikli, Denizli, Turkey;2. Volkswagen AG, Technical Development, 1697, 38436 Wolfsburg, Germany;3. Fraunhofer – Institute for Structural Durability and System Reliability LBF, Bartningstrasse 47, 64289 Darmstadt, Germany;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;1. Global Technology Center in Sustainable Hydro, ALSTOM Hydro Canada Inc., Sorel-Tracy, Canada;2. Department of Mechanical Engineering, École Polytechnique de Montréal, Montreal, Canada |
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| Abstract: | This paper is concerned with the design of complex welded structures subjected to fatigue loadings. In the last years it has been developed a new approach for predicting the high cycle fatigue behaviour of welded joints, based on the Notch-Stress Intensity Factors of the uncracked geometries, which have been successfully applied to welded joints of different geometries using an analytical frame in combination with stress data obtained from Finite Element Analyses. The approach is based on the observation that the very small weld toe radius obtained by using traditional welding technologies is consistent with the assumption of a sharp V-notch geometry, characterised by an exponential stress field, which the fatigue strength depends on. Recently published Eurocodes suggest the use of a hot spot approach, both for steel and aluminium structures. Nevertheless the evaluation of fatigue strength of engineering complex structures remains a difficult and, in some way, controversial subject. We hope that this synthetic presentation of the N-SIF and hot spot approaches as compared to the European Standards could help to clarify the subject and to design better and more reliable structures. |
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