Environmental Engineering Reference
In-Depth Information
Fig. 2.25 The effective packed explosives when the height is not enough [
18
]
So,
h ¼
9
=
2r ¼
2
:
25d
ð
2
:
60
Þ
The effective height is 2.25 times of diameter.
When the packed height is longer than the effective height, the effective packing
mass for base does not increase. The effective mass is the volume of a cone with
base diameter. If the packed height is shorter than the effective height, the effective
packed explosive mass is a truncated cone. The relative packed masses ma under
these two conditions are Eqs.
2.61
and
2.62
, separately.
2
3
p
r
3
h
4
:
5r
;
ma ¼
q
0
ð
2
:
61
Þ
h
2
r
þ
h
3
r
2
4
9
h
8
81
16
2187
h
\
4
:
5r
;
ma ¼
q
0
ð
2
:
62
Þ
(3) Measurement of brisance
The measuring methods for the brisance of liquid explosives are similar to that of
condensed explosives. The measuring dif
culty is larger because of the noncom-
pressibility of liquids. The writer/author measured the brisance of liquid explosives
using the setup of Fig.
2.26
, and summarized a set of methods for evaluating the
brisance of liquid explosives.
In Fig.
2.26
, the plastic shell is hard polyethylene with 1.0 mm thick. The
thickness of the bottom, which is in contact with a lead cylinder, is 0.015 mm. The
dissipative energy of breaking the plastic shell is negligible.
