R. Meyer J. Köhler A. Homburg Explosives

139 Fragmentation Test
plosives with extremely high flash over tendency can be initiated by the
shock wave from one charged borehole to the next one, even at large
distances (W Ditching Dynamite).
Flash Point
Flammpunkt; point d’inflammation
The lowest temperature at which vapors above a volatile combustible
substance ignite in air when exposed to flame.
Fly Rock
Steinflug; projections de roche
Rocks propelled from the blast area by the force of an explosion.
Fragmentation Test
Splittertest; epreuve de fracture
A USA standard test procedure for explosives of military interest.
The weight of each empty projectile and the weight of water displaced
by the explosive charge is determined, from which the density of the
charge is calculated. All 3-inch and 90-mm projectiles are initiated by
M20 Booster pellets, and those used with 3-inch HE, M42AI, Lot KC-5
and 90-mm HE, I1II71, Lot WC-91 projectiles are controlled in weight
and height as follows: 22.50+0.10 gm, and 0.480 to 0.485 inch.
The projectile assembled with fuze, actuated by a blasting cap, Special,
Type II (Spec 49-20) and booster, is placed in boxes constructed
of half-inch pine. The 90-mm projectiles are fragmented in boxes
21V10-1/2V10-1/2 inches and the 3-inch projectiles in boxes 15V9V9
inches external dimensions. The box with projectile is placed on about
4feet of sand in a steel fragmentation tub, the detonator wires are
connected, and the box is covered with approximately 4feet more of
sand. The projectile is fired and the sand runs onto a gyrating 4-mesh
screen on which the fragments are recovered.
Fragment Velocity
Charges 10-1/8 inches long and 2 inches in diameter, containing a
booster cavity, filled by a 72-gm Tetryl pellet (1-3/8 inches diameter,
2 inches long, average density 1.594) are fired in a model projectile of
Shelby seamless tubing, 2 inches ID, 3 inches OD, SAE 1020 steel,
with a welded-on cold-rolled steel base. The projectile is fired in a
chamber, connected to a corridor containing velocity stations, so (pro-