MIL-DTL-46177C(MR)
APPENDIX A
A.3.5 Thickness, impact area. The thickness of ballistic test plates used for
determining ballistic limits should be that area subjected to the ballistic
testing.
A.3.6 Witness plate. A thin sheet located behind and parallel to the ballistic
test sample which is used to detect penetrating projectiles or spall.
A.4
REQUIREMENTS
A.4.1 Resistance to penetration. The minimum ballistic limits shall be in
accordance with the values shown in table A-I.
A.4.2 Cracking. Ballistic test plates shall be visually examined immediately
after testing to determine the presence of cracking. Cracks whose length exceed
3 test projectile diameters, measured from the center of impact, shall be cause
for plate rejection.
A.5
TESTS
A.5.1 Ballistic tests. V50 ballistic tests shall be performed in accordance
with USATECOM test operations procedures for Ballistic Tests of Armor Materials,
TOP 2-2-7l0, to determine compliance with the requirements of table A-I.
A.5.1.1 Plate measurement. Plate thickness as measured by the ballistic test
agency shall be used to determine the required ballistic limit for the plate.
Individual thickness measurement are to be read from a micrometer to the nearest
0.00l inch and the average of these readings reported to the nearest 0.00l inch.
At least one measurement shall be taken along each edge of the plate at a
distance at least one inch from the edge.
A.5.1.2
Rejection and test of ballistic plates.
A.5.1.2.1 First article tests (rejection). Unless noted otherwise in the
contract or order (see 6.2), failure of any one or more of the three first
article tests plates to meet the minimum ballistic requirements as specified in
the appendix to this specification indicates failure of the product and process.
A.5.1.2.2 First article (retests). Resubmission of ballistic retest plates
shall not be made until the manufacturer has made the necessary corrections in
the processing of the material to the satisfaction of the procuring activity.
Three retest plates shall be submitted for first article testing and all three
must pass.
A.5.1.2.3 Acceptance tests (rejection). Unless otherwise noted in the contract
or order (see 6.2), failure of a test plate to meet the ballistic requirements
indicates failure of the lot, however, the final decision will depend on the
outcome of retests, if submitted.
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