| Type of Document |
Master's Thesis |
| Author |
Webster, Keith Gordon
|
| Author's Email Address |
kwebster@vt.edu |
| URN |
etd-01302007-141530 |
| Title |
Investigation of Close Proximity Underwater Explosion Effects on a Ship-Like Structure Using the Multi-Material Arbitrary Lagrangian Eulerian Finite Element Method |
| Degree |
Master of Science |
| Department |
Aerospace and Ocean Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Brown, Alan J. |
Committee Chair |
| Hughes, Owen F. |
Committee Member |
| Neu, Wayne L. |
Committee Member |
|
| Keywords |
- Fluid/Structure Interaction
- UNDEX
- Sandwich Plate System (SPS)
- US Navy Blast Test
- MMALE
- Proximity
|
| Date of Defense |
2007-01-29 |
| Availability |
unrestricted |
Abstract
This thesis investigates the characteristics of a close proximity underwater explosion and its effect on a ship-like structure. Finite element model tests are conducted to verify and validate the propagation of a pressure wave generated by an underwater explosion through a fluid medium, and the transmission of the pressure wave in the fluid to a structure using the Multi-Material Arbitrary Lagrangian/Eulerian method. A one dimensional case modeling the detonation of a spherical TNT charge underwater is investigated. Three dimensional cases modeling the detonation of an underwater spherical TNT charge, and US Navy Blast Test cases modeling a shape charge and a circular steel plate, and a shape charge and a Sandwich Plate System (SPS) are also investigated. This thesis provides evidence that existing tools and methodologies have some capability for predicting early-time/close proximity underwater explosion effects, but are insufficient for analyses beyond the arrival of the initial shock wave. This thesis shows that a true infinite boundary condition, a modified Gruneisen equation of state near the charge, and the ability to capture shock without a very small element size is needed in order to provide a sufficient means for predicting early-time/close proximity underwater explosion effects beyond the arrival of the initial shock wave.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
| |
KeithGWebster_Thesis.pdf |
5.29 Mb |
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00:12:35 |
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