PENETRATION OF PROJECTILES INTO FROZEN GROUND

During three field tests, 30 live and 75 inert bombs were dropped from helicopters into unfrozen, shallowly frozen, and deeply frozen ground at striking velocities ranging from 252 to 800 ft/sec. The bombs were divided into 3 series: 2.50, 2.75, and 3.25 in. diam, weighing 30, 40, and 66 lb each, re...

Full description

Bibliographic Details
Main Authors: Livingston,Clifton W., Waldron,Howard L.
Other Authors: BARODYNAMICS INC GEORGETOWN COLO
Format: Text
Language:English
Published: 1965
Subjects:
(*PROJECTILES
PENETRATION)
(*PERMAFROST
TERMINAL BALLISTICS)
(*POLAR REGIONS
(*TERMINAL BALLISTICS
PERMAFROST)
ARMY
BOMBS
BOMB COMPONENTS
VULNERABILITY
BOMBING
AMMUNITION
permafrost
Online Access:http://www.dtic.mil/docs/citations/AD0616348
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0616348
Description
Summary:During three field tests, 30 live and 75 inert bombs were dropped from helicopters into unfrozen, shallowly frozen, and deeply frozen ground at striking velocities ranging from 252 to 800 ft/sec. The bombs were divided into 3 series: 2.50, 2.75, and 3.25 in. diam, weighing 30, 40, and 66 lb each, respectively. In each series, 29 bombs were made geometrically similar. In addition, for each diameter 3 bombs were made shorter and longer in order to check the effect of different geometry. Bomb specifications included epoxy adhesive (to cement bomb parts), large plastic tail fin and righting movement arm, slenderness of bomb body, and sharpness of the nose. For a given bomb, penetration of the nose is shown to be a straight-line function of striking velocity in ft/sec. This is in accordance with the Livingston penetration equation based on an analogy between plastic deformation and fluid-flow. Penetrations up to 25 ft were achieved. (Author)

Similar Items