MIL-DTL-45225F(MR)
4.8.3
Ballistic tests.
4.8.3.1 Forging thickness measurement. The average thickness of the forging
shall be the mean of at least 4 thickness measurements read to the nearest 0.001
inch. These measurements shall be made in regions of uniform thickness as close
as possible to the intended point of impact of projectiles within the area
required to provide ballistic protection as shown on the drawing. The average
thickness, to the nearest 0.001-inch, shall be used to determine the required
protection ballistic limit.
4.8.3.2 Ballistic tests. Ballistic test forgings shall be tested at locations
specified on the drawings or in the contract or order (see 6.2), at the
government testing activity designated by the procuring activity. The forgings
shall be at 70o + 10oF when ballistically tested. Forgings shall be tested in
accordance with the thickness ranges shown in table IV. The forging thickness
used by the ballistic test agency to determine the required minimum protection
ballistic limit shall be the measured thickness of the forging. The test
forgings may be machined at the location specified for testing provided that such
machining shall not cause the forgings to fall outside the thickness limits for
the thickness range as specified in table IV.
TABLE IV.
Ballistic test forgings.
Nominal design thickness
specified on drawing,
(inches)
Projectile to be
Class A
Class B
used
_________________________________________________________________________________
0.705-1.100
0.750-1.030
Cal. .50 FSP
1.101-1.700
1.031-1.500
Cal. .30 APM2
1.101-1.700
1.031-1.500
20mm FSP
1.701-3.000
1.501-3.000
Cal. .50 APM2
-
3.001-3.425
Cal. .57 AP
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4.9
Rejection and retest.
4.9.1 First article. Failure of the first article test forgings to meet the
requirements of the examinations and tests listed in 4.3.1 indicates failure of
the product.
4.9.1.1 Retests. Resubmission of first article samples shall not be made until
the manufacturer has made necessary corrections in the processing of the material
to the satisfaction of the procuring activity. Forgings submitted for retest
shall be marked R1, R2 and R3 in addition to the requirements of 3.7.
4.9.2
Acceptance.
4.9.2.1 Examination. A production lot shall be rejected for failure to meet the
visual, dimensional and preparation for delivery requirements when examined in
accordance with 4.6.
4.9.2.2 Tests. A production lot shall be rejected for failure to meet any of
the test requirements when tested in accordance with 4.7 and 4.8.
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