Towards a unified methodology for the simulation of rupture in collision and grounding of ships |
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| Institution: | 1. School of Naval Architecture, Dalian University of Technology, Dalian, China;2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;1. Science and Technology on Integrated Logistics Support Laboratory, College of Mechanics and Automation, National University of Defense Technology, Changsha 410073, China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada;3. College of Physics and Information Science, Hunan Normal University, Changsha 410073, China;1. Department of Naval Architecture and Ocean Engineering, INHA University, 100, Inha-Ro, Nam-Gu, Incheon, South Korea;2. DSME R&D Institute, Daewoo Shipbuilding and Marine Engineering Co., Ltd., 26, Eulji-Ro 5 gil, Jung-Gu, Seoul, South Korea;1. Department of Marine Systems Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Maintenance Research Technology Group, National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan;3. Structural Analysis and Processing Research Group, National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan |
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| Abstract: | The aim of the work is the definition of a procedure for the numerical simulation of the response of ship structures under accidental loading conditions, which suffer various different modes of failure, such as tension, bending, tearing and crushing and in particular to investigate the effect of material modeling, i.e. material curve and rupture criterion as well as mesh size and strain rate effect on the results. To this end, different material models and simulation techniques were used for the simulation of eighteen indentation tests conducted by different research groups. The simulations were performed using the explicit finite element code ABAQUS 6.10-2. The tests refer to the quasi-static and dynamic transverse and in-plane loading of various thin walled structures which represent parts of a ship structure. Three rupture criteria are incorporated into VUMAT subroutine, which interacts with the explicit finite element code and refers to an isotropic hardening material that follows the J2 flow theory assuming plane stress conditions, in order to investigate the prediction and propagation of rupture. The focus is on investigating whether it is possible to define a unified methodology, which is appropriate for the simulation of all different tests. Consistency in the numerical results is observed with the use of an equivalent plastic strain criterion, in which formulation a cutoff value for triaxialities below −1/3 is included. |
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| Keywords: | Equivalent plastic strain RTCL BWH Extreme loading Material modeling True stress-strain curve Rupture criteria in non-linear FE codes Indentation tests Mesh size effect Strain rate effect |
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