MIL-DTL-32505
4.5.2.3 Ballistic testing. One plate, 12 inches by 36 inches, shall be randomly selected from each
lot for ballistic testing. The orientation of the plate with respect to the rolling direction shall be at
the option of the producer (see 6.2). The sample shall meet the requirements when tested as
specified in 4.7.3.
4.5.2.4 Stress Corrosion Cracking. Nine test specimens shall be removed from one plate from each
lot for testing in accordance with 4.7.4.
4.6 Examination.
4.6.1 Visual. Each plate shall be examined for compliance with the identification marking (see 3.8)
and workmanship (see 3.10) requirements.
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
and as specified in the contract or purchase order (see 6.2). At a minimum, one plate per lot shall
be randomly selected for dimensional inspection.
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, 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 transverse (LT) direction. 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
B. Test plate thickness, as measured by the ballistic testing agency, shall be used in conjunction
with Table V and Appendix B 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.
4.7.3.1 Ballistic testing facility. Unless otherwise specified in the contract or purchase orders (see
6.2), the ballistic test plates shall be forwarded to the Commander, U.S. Army Aberdeen Test
Center, 400 Colleran Road. Bldg. 358, ATTN: CSTE-DTC-AT-SL-V (K. Beavers), Armor
Acceptance B690, Aberdeen Proving Ground, MD 21005-5059 for ballistic testing for first
article or lot acceptance.
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