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The whipping response of a submerged free-free cylinder due to underwater explosions

Citation

De Candia, S and Ojeda, R and Reid, W and Ratcliffe, M and Binns, J, The whipping response of a submerged free-free cylinder due to underwater explosions, Proceedings of the Pacific 2017 International Maritime Conference, 3-5 October 2017, Sydney, Australia, pp. 1-8. (2017) [Refereed Conference Paper]


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Abstract

Underwater explosions (UNDEX) generated by torpedos and mines present one of the most significant threats to the survivability of naval vessels. A non-contact UNDEX event produces two distinct pressure loading phenomena: an initial short duration, high frequency shock wave followed by a relatively low frequency pulsating bubble containing the gaseous products of detonation. The pulsating bubble may excite global, beam-like, structural response modes of the vessel, known as UNDEX induced whipping. Depending on the size and position of the explosive charge relative to the vessel, the maximum strain levels during whipping may exceed those during the initial shock phase. Due to the large costs of full-scale explosive trials, development of validated numerical modelling procedures for UNDEX whipping and shock response are required to assess the survivability of naval vessels. An experiment has been conducted to investigate the UNDEX whipping response of a fully submerged cylindrical pipe structure considering the effects of different charge sizes, stand-off distances and longitudinal positions along the hull. It was found that the longitudinal stand-off location has a significant influence on the whipping response and that the peak whipping response may not always occur at the stand-off point.

Item Details

Item Type:Refereed Conference Paper
Keywords:Underwater explosions, Structural response, Experimental analysis, Bubbles, Shock
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Structures
Objective Division:Defence
Objective Group:Defence
Objective Field:Navy
UTAS Author:De Candia, S (Mr Steven De Candia)
UTAS Author:Ojeda, R (Dr Roberto Ojeda Rabanal)
UTAS Author:Binns, J (Professor Jonathan Binns)
ID Code:131357
Year Published:2017
Funding Support:Australian Research Council (IC140100003)
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-03-14
Last Modified:2019-03-19
Downloads:0

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