A reliability approach to fatigue crack propagation analysis of ship structures in polar regions |
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| Institution: | 1. Department of Shipbuilding Engineering, Harbin Engineering University, China;2. Department of Marine Technology, Norwegian University of Science and Technology, Norway;3. Department of Naval architecture Ocean Engineering, Harbin Institute of Technology, Weihai, China;4. Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Norway;1. School of Ocean Engineering, Harbin Institute of Technology, Weihai, 264209, PR China;2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, PR China;3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, 610500, PR China;4. Engineering Technology Research Institute, PetroChina Southwest Oil and Gasfield Company, Chengdu, 610031, PR China;1. Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan 430063, PR China;2. Department of Naval Architecture, Ocean and Structural Engineering, School of Transportation, Wuhan University of Technology, Wuhan 430063, PR China;3. Green & Smart River-Sea-Going Ship, Cruise and Yacht Research Center, Wuhan University of Technology, Wuhan 430063, PR China;4. Department of Automotive Engineering, School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, PR China |
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| Abstract: | Fatigue is a common failure mode in ship structures. For structures with an initial crack, the fatigue crack propagation behavior needs to be considered. The purpose of this study is to establish a procedure for analysis of fatigue crack propagation of ship structures in combination with reliability methods. The stress intensity factor (SIF) and geometry correction factor are calculated by means of finite element analysis. Validation for the SIF calculation is achieved by comparing the computed results with those based on related solutions. Since fatigue damage usually occurs in weld areas, the effect of such components on the fatigue crack propagation behavior was also considered in this work. The Paris law in combination with the Monte Carlo technique are employed for the fatigue crack propagation analysis in this study. Reliability updating based on inspection for cracks is also carried out. A computer program was developed for the purpose of fatigue crack propagation analysis within the framework of reliability methods. An application example of fatigue crack propagation in relation to the hull of the icebreaker Xuelong 2 is presented. The sensitivity of the procedure to key analysis parameters (sample size, initial crack size) is also considered. Finally, the effect of low temperatures on the computed results is also analyzed. |
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| Keywords: | Reliability method Monte Carlo technique Fatigue crack propagation Surface crack Low temperatures |
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