Spall Ring Diameter and Paths of Peripheral Spall Particles from Shaped Charge Jet Perforation of Armor Plate
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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The 3.2-inch BRL precision shaped charge warhead was statically fired into armor plate of foreign and domestic production. The standoff distances varied from 2 to 12 cone diameters the plate thicknesses, from 2 to 30 centimeters and the Brinell hardness numbers of the armor from 100 to 450. Measurements of the diameter of the resulting spall scab on the back surface of the target correlate well with the rate of transfer of energy from jet to target. Analysis suggests that super spall may be produced by nearness of the fatter, leading portion of the jet to the back surface of thin plates. Some meager information on the trajectories of peripheral spall particles is also presented.