Explosion Features of Liquid Explosive Materials - Liquid Explosives - page 59

I
S ¼

Z

s ð : Þ

i ¼ Pd 2 50

c pulse is calculated.
Figure 2.21 assumes that the detonation is in one dimension; the explosive is
closely contacted with the target; and the target is an absolute rigid body.
Figure 2.21 shows the pressure affecting on the target According to one-
dimensional isentropic gas dynamics, the function of pressure affecting on the target
from the detonation products is Eq. 2.51 .

Once pressure is known, speci

3

64
27 P 2

h
d

P ¼ ð 2 : 51 Þ

s

Here, h is the length of the packed explosive.
When the detonation ends, s ¼ h = D and the pressure is in Eq. 2.52 .

P ¼ 64 = 27P 2 ð 2 : 52 Þ

The pressure on the target is 64/27 times of detonation pressure. The pressure on
the target comes from the pressure of products, and the pressure, which is produced
by moving/transportation of products with velocity u 2 . The target blocks the

moving or transportation, and the shock waves are re fl ected, which gives the target

large mobile pressure.
When 27P 2 , it shows that when the time is four times of

explosive detonation, the pressure on the target is only 1/27 of detonation ending.
The pressure decay of detonation is very fast, and the decay curve is in Fig. 2.21 .
If the pressure expression (Eq. 2.51 ) is substituted into the integration (Eq. 2.49 ),
the below equation is obtained.

s ¼ 4h = D ; P ¼ 1 =