MIL-DTL-46027K(MR)
4.6.2 Dimensions. Plates within a lot shall be measured to determine compliance with
requirements of paragraph 3.7 in accordance with the sampling procedures approved by
the procuring activity (see 6.2).
4.7 Test specimens.
4.7.1 Chemical composition. Samples for chemical analysis shall be prepared and tested
in accordance with one or more ASTM methods of E34, E716, E227, E607, and E1251.
In case of dispute, analysis by method E34 shall be the basis for acceptance or rejection.
4.7.2 Mechanical properties. Tension test specimens shall be prepared and tested in
accordance with ASTM B557. Specimens shall be taken in the longitudinal direction.
For material less than 0.500 inch in thickness, a standard rectangular tension test
specimen shall be used. For plate in nominal thickness 0.500 to 1.500 inches, inclusive,
tension test specimens shall be taken with the axis midway between the two plate
surfaces. For plate in nominal thickness greater than 1.500 inches, the axis of the tension
test specimen shall be three-fourths of the distance from one surface to the other.
4.7.3 Ballistic testing. The ordered thickness specified in the contract shall be used to
determine the test projectile in accordance with Table V. Ballistic testing shall be in
accordance with Appendix A. Test plate thickness, as measured by the ballistic testing
agency, shall be used in conjunction with Table V and Appendix A to determine the
required V50 protection ballistic limit for that plate. Thickness shall be determined as the
average of at least four thickness measurements read on a deep throat micrometer or by
means of an ultrasonic device to the nearest 0.001 of an inch and rounded off to the
nearest 0.005 of an inch. Measurements shall be made on the intended impact area. 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 ballistic limit table shall be performed. The average plate thickness,
computed to the nearest 0.001-inch, shall be used to determine the minimum required
BL(P) for that plate.
TABLE V. Acceptance ballistic test plates.
Angle of Obliquity in
Ordered Thickness, Inches
Projectile
Degrees
0.500 0.749
Cal. .30 AP
30
0.750 1.000
Cal. .50 FSP
0
1.001 1.700 1/
20mm FSP
0
1.001 1.700 1/
Cal. .30 AP M2
0
1.701 2.000
Cal. .30 AP M2
0
2.001 3.000
Cal. .50 AP M2
0
1/
Two (2) types of projectiles for the same thickness range.
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