A ductile tearing assessment diagram for cracked circular-hollow-section joints under reversed loadings |
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| Institution: | 1. Department of Civil and Environmental Engineering, Centre for Offshore Research and Engineering, National University of Singapore, 117576, Singapore;2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China;3. Department of Structural Engineering, Tongji University, Shanghai, 200092, China;1. Mile Dragić Production, Zrenjanin, Serbia;2. Sigma Energy, Šoštanj, Slovenia;3. University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia;1. School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China;2. Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China;1. Dept. of Hydraulic Engineering, Faculty of Civil Engineering & Geosciences, Delft University of Technology, 2600, GA, Delft, the Netherlands;2. CCCC SFT Technical Joint Research Team, Zhuhai, Guangdong, 519080, China;3. Dept. of Civil and Environmental Engineering, University of Michigan, Ann Arbor, MI, 48109, USA;1. School of AI Convergence, Sungshin Women''s University, 2, Bomun-Ro 34da-gil, Seongbuk-Gu, Seoul, 02844, Republic of Korea;2. Department of Naval Architecture and Ocean Engineering, Seoul National University, 599 Gwanak-Ro, Gwanak-Gu, Seoul, 08826, Republic of Korea;1. School of Civil Engineering, Southeast University, China, #2 Southeast University Road, Jiangning District, Nanjing, China;2. Norwegian Geotechnical Institute, Sognsveien 72, 0855, Oslo, Norway;3. Shell International Exploration and Production Inc., 150 N. Dairy Ashford Road, Houston, TX, 77079, USA;4. Shell International Exploration and Production Inc., 150 N. Dairy Ashford Road, Houston, TX, 77079, USA;5. Norwegian University of Science and Technology (NTNU), Trondheim, Norway |
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| Abstract: | This paper proposes a ductile tearing assessment diagram (TAD) to predict the load resistance to the crack extension relationship during the stable tearing process of the circular-hollow-section (CHS) joints under the reversed in-plane bending actions. The tearing assessment diagram utilizes the envelope of the load-deformation curve from the fracture test under reversed loadings to build the connection among the fracture resistance, load resistance and crack extension. To verify the proposed approach, this study performs fracture experiments, imposing the reversed in-plane bending on the CHS X-joints, made of Q345 steel, with a surface crack near the weld toe. The experimental investigation reveals the effect of the reversed loading on the fracture resistance and validates the TAD-based assessment for tubular joints. Meanwhile, this study performs the cyclic fracture test on the single-edge-notched-tension SE(T)] specimen made of Q345 steel and derives the TAD from the experimental record of the SE(T) specimen. The specimen-based assessment successfully predicts the load versus crack extension relation for the reported joints under reversed loadings. The study provides a basic framework to predict the joint response under reversed loadings by integrating the material fracture characteristics. |
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| Keywords: | Welded tubular joint Fracture resistance curve Tearing assessment diagram Reversed loading |
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