Study on side structure resistance to ship-ship collisions

Zheng, Yuanzhou; Aksu, S; Vassalos, Dracos; Tuzcu, C.

doi:10.1080/17445300701594336

Cited by 21 publications

(9 citation statements)

References 4 publications

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“…Among various type of ships, the oil tanker which can bring about a significant amount of pollution has been utilized as a target structure in the simulations and a host of researchers have fulfilled studies with oil tankers to reduce loss of financial properties and to prevent loss of lives and environmental damages (Zheng et al 2007, Tavakoli et al 2010, Kim et al 2015, Faisal et al 2016, Parunov et al 2016, Youssef et al 2014.…”

Section: Collision Scenariosmentioning

confidence: 99%

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Kim

Paik

2018

Ships and Offshore Structures

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Ship-ship collision frequently occurs in shipping industry. The risks of economic losses and marine pollution have been increased by to ship-ship collisions especially involved with large oil tankers or liquefied natural gas (LNG)-fueled ships. Various type 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 2 certainly one of the most powerful techniques to model the problems. In a shipship 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. It does not allow for deformation and damage.Therefore, no contribution of energy absorption is made by the striking structure. 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. Developed Findings and insights from the present study are summarized.

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Section: Collision Scenariosmentioning

confidence: 99%

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Kim

Paik

2018

Ships and Offshore Structures

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“…Numerous models have been developed to simulate the internal mechanics of ship-to-ship collisions and grounding (Ehlers et al, 2008;Ringsberg, 2009;Zhang and Suzuki, 2006;Zheng et al, 2007). However, the scenarios used for the collision assessment were developed for impacts were the kinetic energy of the impacting object exceeded 100 MJ (Klanac et al, 2009;Samuelides et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of blank torpedo impact on submarine hulls

Chatterton

Ojeda

2014

Ocean Engineering

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“…To prevent such consequences, it is necessary to accurately simulate the structural crashworthiness of ships involved in the accident, including the impact strength and extent of damage. Many studies have been undertaken in the literature, and risk-and simulation-based design methods have been recommended to improve collision safety of ships , Zheng et al 2007, 2015, Khan and Das 2008, Ehlers et al 2012, Tabri 2012, Haris and Amdahl 2012a, 2012b, Youssef et al 2014, 2016, Samuelides 2015, Obisesan 2016 Pedersen 2017, Ko et al 2017, Paik et al 2017a. To investigate the consequences of ship collisions, various methods such as analytical solutions, empirical formulas, experiments, and finite element (FE) analysis are available (DNV 2004, GL 2011, BV 2013.…”

Section: Introductionmentioning

confidence: 99%

A practical method to determine the dynamic fracture strain for the nonlinear finite element analysis of structural crashworthiness in ship–ship collisions

Kim

Sohn

et al. 2017

Ships and Offshore Structures

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Ship collision accidents continue to occur regardless of efforts to prevent them. Ship-ship collisions involve highly nonlinear characteristics associated with structural crashworthiness, including crushing and fracture as well as buckling and plastic collapse. When applying nonlinear finite element method simulations to solve these problems, a reliable value of critical fracture strain accounting for strain-rate effects due to collision speed must be implemented. This study aims to propose a practical method to estimate the dynamic fracture strain to be used for the structural crashworthiness analysis associated with ship-ship collisions using the nonlinear finite element method. For this purpose, the strain-rate characteristics in struck ship structures were investigated by nonlinear finite element method computations, in which the striking vessel was assigned various velocities from 0.5 to 20 knots in the range of practical ship speeds. Based on the computations, an empirical formula was developed to calculate the strain rate at a collision scenario with a given collision speed, allowing for a practical estimation of the dynamic fracture strain. The formula is validated by a comparison with experimental data.

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Study on side structure resistance to ship-ship collisions

Cited by 21 publications

References 4 publications

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Effects of a deformable striking ship's bow on the structural crashworthiness in ship–ship collisions

Finite element simulation of blank torpedo impact on submarine hulls

A practical method to determine the dynamic fracture strain for the nonlinear finite element analysis of structural crashworthiness in ship–ship collisions

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