Fatigue strength assessment of laser stake-welded T-joints using local approaches |
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| Affiliation: | 1. Jiangsu Key Laboratory of Engineering Mechanics, School of Civil Engineering, Southeast University, Nanjing 211189, China;2. School of Mechanical Engineering, Southeast University, Nanjing 211189, China;3. Department of Civil and Environmental Engineering, Centre for Offshore Research and Engineering, National University of Singapore, Singapore 117576, Singapore;4. Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China;1. Technical Faculty of Bor, Vojske Jugoslavije 12, 19210 Bor, Serbia;2. Faculty of Engineering, University of Kragujevac, Sestre Janji? 6, 34000 Kragujevac, Serbia and Research Center, University of ?ilina, 010 26 ?ilina, Slovakia;1. Shanghai Key Laboratory of Material Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China;3. Joining and Welding Research Institute (JWRI), Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;1. Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada;2. Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, P.O. Box 5058, 2600GB Delft, The Netherlands;3. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699, United States |
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| Abstract: | This study investigates the applicability of local stress- and energy-based approaches to the fatigue strength assessment of laser stake-welded T-joints. The T-joint has two crack-like notches with infinitesimal tip rounding on each side of the weld. The local approaches used are fictitious tip rounding of 1 and 0.05 mm and the approaches that assume zero rounding within this study, namely the stress intensity factor, the average strain energy density and the J-integral.It is shown that the slopes of the fatigue resistance curves vary between 4 and 8 under different loading conditions imposed on the joint. The slope value exhibits a linear relation with the dimensionless gradient of the maximum principal stress evaluated at the critical notch tip. The same linear relation between the slope and the gradient is valid for all approaches. Because of the slopes, which differ from the usual 3, the agreement of the T-joints with other steel joints is obtained at five million load cycles. The exception is the fictitious rounding concept of 0.05 mm, in which case the recommended design S–N curve with a slope of 3 appears overly conservative in a high-cycle regime. |
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| Keywords: | Fatigue assessment Strain energy density Stress intensity factor Fictitious notch rounding |
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