Use of localized necking and fracture as a failure criterion in ship collision analysis |
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Institution: | 1. State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;2. School of Marine Science and Technology, Newcastle University, Newcastle Upon Tyne, UK;3. COTEC Offshore Engineering Solution, Houston, USA;1. School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 460074, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE), Shanghai 200240, China;3. School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK;1. Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Norway;2. Centre for Autonomous Marine Operations and Systems (AMOS), NTNU, Norway;3. Center for Sustainable Arctic Marine and Coastal Technology (SAMCoT), NTNU, Norway |
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Abstract: | This study explores the use of localized necking for failure modeling in maritime crash analysis, using large shell elements. The assumption that the failure of a large shell element occurs simultaneously with the onset of localized necking is revisited. This study particularly investigates the numerical implementation of the localized necking condition and its implications on the results of ship collision analysis involving not only plate rupture but also various failure mechanisms such as the crushing and tearing of web girders, stringers, and their intersections. Through a series of large-scale collision simulations, the effects of bending deformation on the initiation of necking, non-proportional loading paths, and ductile fractures not preceded by localized necking, are investigated. It is demonstrated that a localized necking-based fracture model provides a reasonable, relatively mesh-insensitive estimate of the onset of fracture in the outer hull panels; however, fracture propagation is very sensitive to the numerical implementation of the necking and fracture model, especially for the cases involving the crushing of web frames and stringers. |
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Keywords: | Localized necking Ductile fracture Shell element Fracture modeling Ship collision Accidental limit state |
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