MIL-DTL-398D
10.0
cm
8.0
cm
6.5
cm
5.0
cm
NOTE: The actual height for RDX should be determined from test
data on RDX previously tested.
Before each drop, the striker and anvil shall be cleaned.
Ethanol or acetone on a wipe shall be used to clean the surfaces.
A spatula or sandpaper may also be used to clear any further
residue from previous tests. A 35 mg sample (on the sand paper)
shall be placed on the anvil. Gently place the striker on top of
the sample. Close the shield. Turn on the electromagnet, and
using the hoist, raise the weight to the desired height. Face
the opposite direction of the impact machine and turn the
electromagnet switch to the "off" position, allowing the weight
to fall and strike the top of striker. Lift and secure the
weight, remove the striker to determine whether the drop was a
positive (explosion) or negative (nonexplosion) reaction. Any
reaction observed is considered a go: smoke, flame, sparks,
odor, burn marks on the striker or anvil, a noise above the
ambient drop weight noise. A positive reaction shall be recorded
as "1", and a negative reaction as a "0". When a positive
reaction is achieved, the next drop height shall be one level
lower. When a negative reaction is achieved, the next drop
height shall be one level higher.
NOTE: The actual test begins when a positive reaction is
followed by a negative reaction, or a negative reaction is
followed by a positive reaction. It may be necessary to make
several test shots before the starting point of the test is
recorded.
Repeat 4.7.8.3 (b) until all 25 samples prepared in 4.7.8.3 (a)
are drop-tested and recorded.
(c) Test result calculations. The test result calculation
may be preprogrammed in a computer and automatically calculated
based on the results recorded in the computer. If the test was
recorded on paper, enter all data into the impact spreadsheet.
In either case, a hard copy of the results shall be immediately
printed following the testing for record keeping. The following
is an explanation of the calculation for the height in
centimeters where 50 percent of the explosions occur:
The lowest drop height with recorded data is assigned an "i"
value of 0. Each successively greater height is assigned values
of 1, 2, etc. The following values are calculated:
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