English

DTIC ADA289704: The Initial Velocities of Fragments from Bombs, Shell, Grenades.

To assess the efficiency of a projectile, it is often required to predict the initial velocities of the fragments from a knowledge of the dimensions of the metal casing and the character and quantity of explosive. Between a grenade containing 1 1/2 ounces of H.E. and a bomb containing 3000 pounds of H.E. the difference in scale is so great, that it is a question whether any simple scheme will apply over the whole range. A theory is put forward, making the following assumption, that the contribution to the total kinetic energy made by the detonation of unit mass of explosive is independent of the size of the projectile. In a large bomb the explosion gases have actually more kinetic energy than the fragments. A simple expression is found for the average initial velocity in terms of the charge-weight ratio; C/M = 0.06 to C/M = 5.6.

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