Explosion Features of Liquid Explosive Materials - Liquid Explosives - page 51

Fig. 2.18 The principle schematics of work capacity by a pendulum [ 18 ]

The remaining top space of lead cylindrical hollowness is filled by selected dry

arenaceous sand to prevent the flying of explosion products. The increased volume

is used to represent the work ability or capacity. Obviously, the more increased
hollowness volume, the more powerful work ability/capacity. Because of the
temperature effect for lead and the detonator also involves in the enlargement of
hollowness, the measured data should be calibrated.
(2) Measurement of work capacity/power using a pendulum
A work capacity/power pendulum method is also named as ballistic mortar test.
The measured work value is used to evaluate the relative work capacity. Its prin-
ciples are in Fig. 2.18 .
The explosion of liquid explosives produces high-temperature and high-pressure
products. The expansion of these products works for the surrounding. Its work has
two parts. One part is used to eject a bullet, and the second is to swing the
pendulum to angle

fl

with gravity center lifted up to h. The work ability/capacity of
explosives is the sum of the two works.

ʱ

A ¼ A 1 þ A 2 ð 2 : 38 Þ

ʱ

Here, A is the work of the explosive; A 1 is the swing of the pendulum to angle ;

A 2 is the mechanical work of ejecting the solid bullet.
A 1 is the swing of the pendulum to angle ʱ . It equals the work of lifting the

gravity center of the pendulum up to h.