Underwater Fragmentation of Cylinders

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Authors
  1. Lee, J.J.
  2. Rude, G.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN)
Abstract
Because underwater explosion fragments have a limited range of propagation, fragment dama from cased underwater charges has not been considered a serious threat. With recent interest in asymetric threats and close-proximity improvised explosives, there is renewed interest in the fragmentation properties of cased underwater explosives, particularly in shallow depths where fragments can be launched out of the spray dome into the air. The present paper examines the fragmentation characteristics of metal cylinders filled with explosive and detonated underwater. The fragmentation process was filmed using high-speed video, revealing a fragment cloud closely confined to the detonation product bubble. However, small protrusions appearing on the bubble surface at later times may indicate fragments pulling ahead of the bubble interface. Fragment samples were recovered after the tst, and the size distributions showed a non-Gaussian trend with the fragment masses significantly larger than air. As expected, the fragment velocities decayed quickly due to water drag, limiting the damage threat to very short distances from the charge. This study provides some insight into the underwater fragmentation process and damage potential of the fragments.
Report Number
DRDC-SUFFIELD-SL-2006-181 — Scientific Literature
Date of publication
01 Jan 2006
Number of Pages
11
DSTKIM No
CA028300
CANDIS No
526359
Format(s):
Hardcopy;Document Image stored on Optical Disk

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