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Research Papers: Ocean Engineering

Experimental Research on the Responses of Neoprene Coated Cylinder Subjected to Underwater Explosions

[+] Author and Article Information
Yong Chen

Institute of Vibration, Shock & Noise,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
200240, Shanghai, PRC
e-mail: chenyong@sjtu.edu.cn

Yu Wang

Naval Research Center,
Box 1303-14,
100073, Beijing, PRC

Hongxing Hua

Institute of Vibration, Shock & Noise,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
200240, Shanghai, PRC

1Corresponding author.

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNALOF OFFSHORE MECHANICSAND ARCTIC ENGINEERING. Manuscript received January 25, 2011; final manuscript received February 11, 2012; published online February 22, 2013. Assoc. Editor: Wei Qiu.

J. Offshore Mech. Arct. Eng 135(1), 011102 (Feb 22, 2013) (8 pages) Paper No: OMAE-11-1007; doi: 10.1115/1.4006761 History: Received January 25, 2011; Revised February 11, 2012

The dynamic responses of a neoprene coated cylinder subjected to underwater explosion were experimentally investigated. Two metallic cylinders of the same geometry were simultaneously fire tested in an artificial lake. One of the cylinders was coated with a layer of neoprene and the other had none. The strain and acceleration recorded at some typical locations on the cylinders and inner structures were qualitatively compared. It was shown that the shock environment associated with the inner structure can be improved to some extent after the rubber layer is coated, but the strain at the outer hull, especially in the hoop direction, is notably amplified. It verifies the fact that soft coating can cause concentration of stresses, mainly on the shell that is directly in contact with the coating layer.

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Figures

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Fig. 1

Geometry of the test cylinders (unit: mm)

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Fig. 2

Practical shape and inner structure of the tested models: (1) uncoated cylinder, (2) coated cylinder, (3) end segment, (4) stell rod, (5) isolator, (6) auxiliary plate

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Fig. 3

Stress-strain curves of neoprene

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Fig. 4

Schematics of underwater test models (unit: mm)

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Fig. 5

Locations of accelerometers and strain gauges (unit: mm)

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Fig. 6

Typical free-field pressure history within 600 ms (a) and 4 ms (b)

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Fig. 7

(a) The time history of acceleration at A3, uncoated model, event I; (b) the time history of acceleration at A3, coated model, event I

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Fig. 8

The shock response spectrum of A3, event I

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Fig. 9

Typical strain record measured at Ea1, event I

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