Numerical study on fatigue crack growth at a web-stiffener of ship structural details by an objected-oriented approach in conjunction with ABAQUS |
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| Institution: | 1. School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;2. Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics (HUST), Wuhan, Hubei 430074, China;1. Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80523, United States;2. US Army Corps of Engineers, Engineer Research & Development Center, Vicksburg, MI 39180, United States;1. Chalmers University of Technology, Department of Shipping and Marine Technology, Division of Marine Design, SE-412 96 Gothenburg, Sweden;2. SP Technical Research Institute of Sweden, SE-501 15 Borås, Sweden;3. Det Norske Veritas AS, Veritasveien 1, 1322 Høvik, Norway;1. Department of Naval Architecture & Ocean Engineering, Osaka University, Osaka, Japan;2. Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden;3. Department of Mathematical Sciences, Chalmers University of Technology, Gothenburg, Sweden;4. Maritime Section, DNV-GL, Hovik, Norway;1. Graduate School of Engineering, Hiroshima University, 4-1, Kagamiyama 1-chome, Higashi-Hiroshima 739-8527, Japan;2. Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510, Japan;1. CEIT and TECNUN (University of Navarra), P. Manuel Lardizábal 15, 20018 San Sebastián, Spain;2. Industria de Turbo Propulsores S.A. ITP, Parque Tecnológico, Edificio 300, 48170 Zamudio, Spain |
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| Abstract: | It is necessary to manage the fatigue crack growth (FCG) once those cracks are detected during in-service inspections. This is particular critical as high strength steels are being used increasingly in ship and offshore structures. In this paper, a simulation program (FCG-System) is developed utilizing the commercial software ABAQUS with its object-oriented programming interface to simulate the fatigue crack path and to compute the corresponding fatigue life. In order to apply FCG-System in large-scale marine structures, the substructure modeling technique is integrated in the system under the consideration of structural details and load shedding during crack growth. Based on the nodal forces and nodal displacements obtained from finite element analysis, a formula for shell elements to compute stress intensity factors is proposed in the view of virtual crack closure technique. Neither special singular elements nor the collapsed element technique is used at the crack tip. The established FCG-System cannot only treat problems with a single crack, but also handle problems with multiple cracks in case of simultaneous but uneven growth. The accuracy and the robustness of FCG-System are demonstrated by two illustrative examples. No stability and convergence difficulties have been encountered in these cases and meanwhile, insensitivity to the mesh size is confirmed. Therefore, the FCG-System developed by authors could be an efficient tool to perform fatigue crack growth analysis on marine structures. |
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| Keywords: | Fatigue crack growth Marine structures FCG-System Object-oriented programming Virtual crack closure technique |
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