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Untitled - Sciencemadness Dot Org

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Explosive<br />

Table 3.33 CYCLOTOL ON PLEXIGLAS<br />

DETONATION PROPERTIES<br />

RDX/TNT: 74.99 f 0.01 wt% RDX. 1.200 f 0.001 g/ems. Four 152 f 0.13-mm-<br />

long, 141-mm-diam pieces to make a 610-mm-long charge pressed from ball-milled<br />

powder of which 86% passed a 44-pm screen and 12% passed a 96-pm screen. Con-<br />

tained in 5mm-wall brass tubes. P-080 and 13-mm-thick Comp. B booster. D at in-<br />

finite diameter and 78 wt% RDX is 6.535 km/s.<br />

Plates<br />

Plexiglas (polymethylmethacrylate), nominal 1.18 g/cm3.<br />

Analysis<br />

Shot<br />

No.<br />

Plate Plate<br />

Density Thickness<br />

(g/cm* ) (mm)<br />

Free-Surface<br />

Velocity<br />

(km/s)”<br />

7c 239 1.179 6.26 3.613 xk 0.029<br />

7C 240 1.179 12.61 3.451 * 0.021<br />

7C 242 1.179 19.04 3.342 zk 0.024<br />

7C 241 1.179 24.61 3.322 f 0.032<br />

7C 238 1.182 38.05 3.305 f 0.023<br />

7C 237 1.182 48.61 3.173 f 0.035<br />

_--------<br />

*Mean and standard deviation of seven determinations on each<br />

shot.<br />

Linear least squares fitting gives U, = 3.581 km/s - 0.00858 t (mm). At t = 0,<br />

plate U, = 5.220 km/s and P, = 10.92 GPa. Acoustic approximation with D = 6.490<br />

km/s, pox = 1.200 g/cm3, and porn = 1.180 g/cm3 gives corresponding explosive<br />

parameters of P, = 12.36 GPa, U,, = 1,587 km/s, and y = 3.089.<br />

267

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