A modified numerical calculation method of collapse pressure for thick-walled offshore pipelines |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China;3. Offshore Engineering Plan Approval Center of CCS, Tianjin, 300457, China;4. Powerchina Huadong Engineering Corporation, Zhejiang, 350003, China;1. College of Civil Engineering, Hunan University, Changsha, 410082, China;2. Institute for Ocean Engineering, China University of Petroleum, Beijing, 102249, China;1. Structural Impact Laboratory (SIMLab), Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway;2. Centre for Advanced Structural Analysis (CASA), NTNU, Trondheim, Norway;3. Equinor Research Centre, Arkitekt Ebbells vei 10, Trondheim, Norway;3. School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, China;1. School of Engineering, Institute for Infrastructure and Environment, The University of Edinburgh, Scotland, UK;2. Department of Mechanical Engineering, University of Thessaly, Volos, Greece |
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| Abstract: | Considering the shear deformation and thickness stretching of large deformation, a modified numerical calculation method based on the thick shell theory is established to determine the collapse pressure of thick-walled pipes. Verification experiments are conducted on ten pipe specimens in hyperbaric chambers. The good agreement between experimental results and numerical predictions shows the validity and reliability of the new numerical calculation method. Combining DNV specification, the characteristic collapse pressure is also calculated for comparison. The difference between experimental results and DNV calculations illustrates the latter one is much conservative in predicting collapse pressure for thick-walled pipes. Sensitivity analysis on manufacturing imperfections and material properties is investigated for pipes with different D/t ratios. Thick-walled pipes are easier to be affected by initial ovality, residual stress and hardening factor. Based on the stress distribution at the moment of collapse, a novel discovery is found that the collapse pressure of thick-walled pipes is dominated by material plastic behavior. |
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| Keywords: | Collapse pressure Thick-walled pipes Shear deformation Manufacturing imperfections |
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