MIL-PRF-46103E
as to contractor, contract number, manufacturer, and date. The testing facility
shall report raw data, velocities, penetration observation, thickness, and the
ballistic type and class (see 1.2) for each test sample.
4.4.2 Ballistic deformation. Examine the armor and the backing material to
determine if the projectile made a fair hit and whether penetration occurred. If
no penetration occurred and the projectile made a fair hit, measure and record
the depth of the depression made in the armor backing material to determine
compliance with the ballistic deformation requirement in 3.4.2. The depth of the
depression is the distance from the original undisturbed surface of the backing
material to the lowest point of the depression. A projectile that impacts at too
high a velocity, but is otherwise a fair hit that meets the ballistic
deformation requirement in 3.4.2, shall be considered a fair hit for the
determination of deformation. Penetration (complete or partial) by any fair hit,
not meeting the ballistic deformation requirement in 3.4.2, or penetration by a
projectile at a velocity lower than the minimum required impact velocity, shall
constitute failure. The testing facility shall report ballistic deformation for
each test sample.
4.4.3 Areal density. The areal density shall be reported for each test sample.
The areal density in pounds per square foot (lb/ft2) and in kilograms per square
meter (kg/m2) of the composite armor, shall be calculated from measurements on
each component. Each component shall be weighed to the nearest 0.01 lb (0.0045
kg). The thickness shall be measured to 0.00l in. (0.025 mm) at four corner
locations on each component. Six measurements shall be made at each corner with
the first measurement taken approximately 1 in. (25 mm) from the edge of the
corner and the remaining five taken on a straight line toward the center of the
armor with the measurements spaced in approximately one inch increments. A deep
throat type depth gage shall be used for taking measurements. The average of the
24 readings shall be used in the calculation of the areal density for each
component. The average density of each component shall be determined by using
ASTM D792, except the immersed weight shall be determined to 0.01 lb (0.0045 kg)
and the liquid used shall be clean tap water, containing a wetting agent if
necessary, which shall be changed just prior to examination of each lot. The
areal density of the composite armor, without spall cover and spall cover edge
strip, shall be the cumulative areal densities of each component calculated to
the nearest tolerance of 0.l lb/ft2 or (0.2 kg/m2) as follows:
Areal density (lb/ft2) = 5.202 x Density (g/cm3) x Thickness (in.).
Areal density (kg/m2) = 10.000 x Density (g/cm3) x Thickness (cm).
4.4.4 Vibration. The composite armor shall be tested for vibration in
accordance with MIL-STD-810, Method 514.4 for the following vibration
environment categories and meet the requirement specified in 3.5.1:
Category
Description
Loose cargo
Equipment carried on ground vehicles as unrestrained
cargo
Jet aircraft
Equipment installed in jet aircraft manned and unmanned
Helicopter
Equipment installed in helicopters
Ground mobile
Equipment installed in wheeled vehicles trailers and
tracked vehicles
Marine
Equipment installed in ships or other naval watercraft
Minimum integrity test
All other and vibration-isolated equipment
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