Accession Number : AD0616348

Title :   PENETRATION OF PROJECTILES INTO FROZEN GROUND,

Corporate Author : BARODYNAMICS INC GEORGETOWN COLO

Personal Author(s) : Livingston,Clifton W. ; Waldron,Howard L.

Report Date : MAR 1965

Pagination or Media Count : 51

Abstract : 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)

Descriptors :   (*PROJECTILES, PENETRATION), (*PERMAFROST, TERMINAL BALLISTICS), (*POLAR REGIONS, TERMINAL BALLISTICS), (*TERMINAL BALLISTICS, PERMAFROST), ARMY, BOMBS, BOMB COMPONENTS, VULNERABILITY, BOMBING, AMMUNITION

Distribution Statement : APPROVED FOR PUBLIC RELEASE