J-integral-based approach to fatigue assessment of laser stake-welded T-joints |
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| Affiliation: | 1. School of Civil Engineering, Lan Zhou University of Technology, lanzhou 730050, China;2. Department of Construction Engineering and Management, Strathclyde University, Glasgow G4 0NG, United Kingdom;3. School of Civil and Architectural Engineering, Yangtze Normal University, Chong Qing 408000, China;1. Department of Engineering Mechanics, Nha Trang University, 02 Nguyen Dinh Chieu Street, Nha Trang City, Viet Nam;2. Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka-machi, Nagaoka-shi, Niigata 940-2188, Japan;1. School of Civil Engineering, Yantai University, Yantai 264005, China;2. China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha 410082, China;3. School of Engineering and Mathematical Sciences, City University London, Northampton Square, London EC1V 0HB, UK;1. The State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China |
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| Abstract: | The aim of this paper is to investigate the influence of the plate thickness on the fatigue strength of laser stake-welded T-joints under the tension loading condition. Fatigue tests were conducted on specimens with plate thicknesses below 5 mm subjected to tension loading with the load ratio R = 0. The statistical analysis of the weld geometry showed a normal distribution of the each parameter that was measured. In addition, the parameters had similar proportions in comparison to the specimens with plate thicknesses above 5 mm. FE analysis was performed with the aim of determining the stress state in the joint along with the J-integral. If the square root of the J-integral, √ΔJ, is used as the fatigue strength assessment parameter, the fatigue strength obtained at five million cycles is similar as in the case of other steel welded joint types. The investigation concluded that the stress state changes with the reduction of the plate thicknesses and the contribution of fracture mode II becomes significant. However, using √ΔJ as a fatigue strength assessment parameter ensures that the complex state of the mixed fracture mode loading is accurately accounted for. This fact further enables the fatigue strength of laser stake-welded T-joints of any plate thicknesses to be described by means of a narrower scatterband than the one obtained by the nominal stress approach. |
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