Research Papers: Offshore Technology

A Rubber Bag for Liquid Cargo to Improve Ship Collision Resistance

[+] Author and Article Information
Jan M. Kubiczek

Ship Structural Design and Analysis,
Hamburg University of Technology (TUHH),
Hamburg 21073, Germany
e-mail: kubiczek@tuhh.de

Sören Ehlers

Ship Structural Design and Analysis,
Hamburg University of Technology (TUHH),
Hamburg 21073, Germany
e-mail: ehlers@tuhh.de

Lars Molter

Center of Maritime Technologies e.V. (CMT),
Hamburg 22305, Germany
e-mail: molter@cmt-net.org

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 1, 2016; final manuscript received July 13, 2017; published online September 14, 2017. Assoc. Editor: Jonas W. Ringsberg.

J. Offshore Mech. Arct. Eng 140(1), 011301 (Sep 14, 2017) (6 pages) Paper No: OMAE-16-1155; doi: 10.1115/1.4037486 History: Received December 01, 2016; Revised July 13, 2017

Collisions and grounding accidents of ships, but also the failure of the hull-integrity, can lead to oil leakage. Examples are the Rena in 2011, the Hebei Spirit in 2007, and the much known accident of the Prestige in 2002. Consequently, research regarding the enhancement of the structural design to increase the safety-level of ships in case of accidents is important. In this paper, the use of a rubber bag as a second barrier is presented as an alternative concept to prevent oil leakage in case of accidents. The influence of the rubber bag is investigated using the exemplary simulation of a ship collision. A simplified tanker side structure as well as a box-shaped rubber bag is analyzed with the finite element (FE) method. The material model for the rubber bag is calibrated with tensile tests to obtain the required material parameters. The reaction forces and the associated penetration depth are analyzed. The comparison is done between the structure with and without the rubber bag. For the latter, the general behavior of an empty tank in a ship side structure is compared with the large-scale experimental results. Furthermore, an additional increase of the collision resistance of the ship due to the rubber bag without changing the common structural design is discussed.

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Fig. 1

Dimensions of used double hull structure

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Fig. 2

Bulbous bow outer contour [22]

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Fig. 3

FE model of the rubber bag

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Fig. 4

Extension of elastomer tensile specimen [23]

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Fig. 5

Tensile test specimen dimensions [32] (top) and inner structure (bottom)

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Fig. 6

Tensile test results in and normal to fiber direction with mean curves

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Fig. 7

Curve fit for Mooey–Rivlin coefficients

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Fig. 8

Force–displacement curves until failure of outer shell

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Fig. 10

von Mises stress (GPa) comparison between void (top) and tank (bottom)

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Fig. 9

Reaction force until failure of outer shell

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Fig. 11

Influence of rubber bag on reaction force

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Fig. 12

Comparison between rubber bag simulation and test with granular hollow glass spheres [21]




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