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Stability of submarine bi-material pipeline-liner system with novel polyhedral composites subjected to thermal and mechanical loading fields
Institution:1. School of Civil Engineering, Hunan University of Technology, Zhuzhou, Hunan, 412007, China;2. Key Laboratory of Safety Control of Bridge Engineering, Ministry of Education (Changsha University of Science and Technology), Changsha, Hunan, 410114, China;3. China Institute of Water Resources and Hydropower Research, Beijing, 100038, China;1. China Communication Construction Corporation Third Harbor Engineering Corporation Limited, Shanghai, 200032, China;2. Key Laboratory of Performance Evolution and Control for Engineering Structures (Ministry of Education), Tongji University, Shanghai, 200092, China;1. National Maritime Research Institute, 6-38-1, Shinkawa, Mitaka-shi, Tokyo, 181-0004, Japan;2. Faculty of Engineering Yokohama National University, 79-1 Tokiwadai Hodogaya-ku, Yokohama, Kanagawa, 240-8501, Japan;1. State Key Laboratory of Ocean Engineering, SJTU, China;2. Centre for Autonomous Marine Operations and Systems (AMOS), NTNU, Norway;3. Yantai CIMC Offshore Co., Ltd, China;4. Yantai CIMC Blue Ocean Technology Co., Ltd, China;1. National Centre for Maritime Engineering and Hydrodynamics, Australian Maritime College, University of Tasmania, Launceston, Tasmania, Australia;2. NavTec Pty Ltd, Perth, Western Australia, Australia
Abstract:This study is concerned with the thermal and mechanical instability behaviors of composite novel liners encased in deteriorated pipelines. A liner may contain many connected segments, and two adjacent segments may become disconnected after long years of service. In such a case, the single disconnected segment may reduce to a ring. An innovative polyhedral configuration is introduced to improve the bending stiffness of the composite ring that is confined by the pipeline. The radius and bending rigidity of the ring are simplified analytically to facilitate the derivation of the critical buckling load. By employing the classical shell criteria, and defining an admissible displacement function, the expression of the potential energy function is obtained with only two unknown parameters. Taking the first derivative of the energy function to the two unknowns respectively generates two equilibrium equations. By solving the two equations, the analytical buckling load is obtained for a composite polyhedral ring in a thermal variational field. Then, two comparisons are taken between the present analytical predictions and results from elsewhere, and good agreements are obtained. An amplification coefficient is defined as the ratio between the buckling load of the polyhedral and circular rings. Finally, parametric evaluations indicate the amplification coefficient reduces with the increase of thickness-to-radius ratio, the increase of the number of sides, and the increase of the temperature variation, respectively. Therefore, a polyhedral ring with a low thickness-to-radius ratio is recommended in engineering applications.
Keywords:Innovative polyhedral liner  Buried pipeline  Buckling responses  Mechanical and thermal loading fields  Amplification coefficient
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