MIL-DTL-46083D(MR)
APPENDIX A
A.4
REQUIREMENTS
A.4.1 Resistance to penetration. The minimum required ballistic limit
shall be in accordance with the values shown in tables A-I through A-VII. In
those cases where the BL(P) is within ± 10 fps of the minimum required value
for the measured average thickness (to the nearest 0.005 inch), an
interpolation of the appropriate table will be performed. The average plate
thickness, computed to the nearest 0.001 inch, will be used to determine the
minimum required ballistic limit.
A.5
TESTS
A.5.1 Ballistic tests. Testing shall be in accordance with MIL-STD-662,
V50 Ballistic Test for Armor, except that nothing in this procedure shall be
construed to supersede or invalidate the requirements of this specification.
A.5.1.1 Temperature conditioning. Prior to the test, the test item(s) will
be temperature conditioned for at least eight hours. Thermostatic control
will be such that the average temperature of the item during the test shall be
72 ± 15°F (22 ± 8°C).
A.5.1.2
Protection ballistic limit, BL(P).
A.5.1.2.1 Normal circumstances. The BL(P) shall consist of an equal number
of fair impact complete and partial penetration velocities attained by the up-
and-down firing method. All BL(P)'s shall be computed using the highest
partial penetration velocities and the lowest complete penetration velocities.
Firing shall continue until either a 4-round BL(P) having a maximum velocity
spread of 60 fps or a 6-round BL(P) having a maximum velocity spread of 90 fps
has been attained, whichever comes first in the normal sequence of firing. If
both occur simultaneously, the 6-round BL(P) will be reported.
A.5.1.2.2 Large zone of mixed results. In the event that the zone of mixed
results (difference between the high partial penetration velocity and the low
complete penetration velocity, the PP[P] velocity being higher than the low
CP[P] velocity) exceeds 90 fps, the firing data will be compared with the
specification minimum ballistic requirements. If the lowest complete
penetration velocity is equal to or above the minimum specified ballistic
limit velocity for the plate thickness, the ballistic limit will be computed
on the basis of 4 or 6-rounds using the smallest possible velocity spread.
If the lowest complete penetration velocity is below the minimum allowable
ballistic limit velocity, then testing will continue until a 10-round
ballistic limit has been attained using the smallest possible velocity spread.
Ten-round ballistic limits will be reported as such on the armor data report
in accordance with MIL-STD-662.
A.5.1.2.3 Reduction of large velocity gap in borderline cases. If the
ballistic limit, which has been determined, is within ± 10 fps from the minimum
allowable ballistic limit and a gap exists which is greater than 25 fps, then
another round, or rounds, will be fired to reduce the gap to 25 fps or less.
The ballistic limit will then be recomputed using the above criteria. The
recomputed BL(P) will be reported as the BL(P) of the plate (in borderline
cases, a reduction of the gap between the high partial penetration velocity and
the low complete penetration velocity should result in a better evaluation of
the BL(P).
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