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Contribution of a deformable striking-ship structure to the structural crashworthiness of ship-ship collisions

Paik, J; (2017) Contribution of a deformable striking-ship structure to the structural crashworthiness of ship-ship collisions. In: (Proceedings) International Conference on Ships and Offshore Structures. (In press).

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Abstract

Ship-ship collision is one of the most frequent types of accidents in shipping industry. The risks of massive financial losses and marine pollution have been increasing due to ship-ship collisions where large oil tankers or liquefied natural gas (LNG)-fueled ships can be involved in the accidents. Various types of methods are available for the purpose of safety studies in association with structural crashworthiness involving crushing and fracture in ship-ship collisions. In the perspectives of multi-physics and multi-criteria involved, however, the nonlinear finite element method is certainly one of the most powerful techniques to model the problems. In a ship-ship collision accident where the bow of a striking ship is collided with the side of struck ship, the kinetic energy must be absorbed by both striking and struck ship structures in terms of collision damages and corresponding strain energies. As the bow structure of the striking ship is usually much stiffer than the side structure of the struck ship, the former has been modelled as a rigid body in the industry practice that does not allow deformation or damage so that no contribution to the energy absorption is made by the striking body. As the energy absorption characteristics of the striking ship depends on the structural arrangement of bulbous bow and flare, however, the contribution of striking ship cannot be entirely neglected. The aims of the present study are to examine the effects of a deformable striking ship structure on the structural crashworthiness of ship-ship collisions using LS-DYNA nonlinear finite element method computations. As an illustrative example in the paper, the struck ship is a VLCC class double hull oil tanker, while the struck ships are two types: a VLCC class tanker and a SUEZMAX class tanker. The relationships between collision forces versus penetration together with their energy absorption capabilities are characterized in association with the contributions of the striking ship bow where the deformable striking ship structures are compared with the rigid striking ship structures. Findings and insights developed from the present study are summarized. Details of the computations are documented.

Type: Proceedings paper
Title: Contribution of a deformable striking-ship structure to the structural crashworthiness of ship-ship collisions
Event: International Conference on Ships and Offshore Structures
Location: Shenzhen, China
Dates: 11 September 2017 - 13 September 2017
Language: English
Keywords: Ship-ship collision; deformable striking bow; oil tanker; structural crashworthiness; nonlinear finite element analysis.
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
URI: http://discovery.ucl.ac.uk/id/eprint/1563778
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