MIL-DTL-46100E (MR)
4.8.2.1 Hardness tests for thin gage. For plates less than 0.187 inches (4.75 mm) in
thickness, a Brinell hardness test shall be conducted in accordance with ASTM E10 or
ASTM E110 (for portable testing), using either a 5 mm carbide ball and a 750 kilogram
load or a 10 mm carbide ball and a 1500 kilogram load.
4.8.3 Charpy V-notch impact tests. At least six (6) Charpy V-notch impact test specimens
shall be taken from the sample and shall be prepared and tested in accordance with ASTM
E23 and ASTM A370. Charpy V-notch impact test specimens shall be taken in both the TL
orientation and in the LT orientation from locations midway between the top and bottom
surfaces of the plate and at least 4 inches or 2T; whichever is less, from any quenched edge
as well as outside the heat affected zone of any thermally-cut edge. The largest attainable
subsize Charpy V-notch impact specimens shown in Figure 7 of ASTM E23 shall be used.
4.8.4 Bend test. The bend test shall be conducted in accordance with ASTM E290 using
method referred to as the Guided-Bend Test, Figure 3.
4.8.5 Ballistic tests. Ballistic testing of armor plate shall be conducted at a Government
approved test facility specified in 4.2.1, unless otherwise specified in the contract or
purchase order (see 6.2). Testing shall be conducted in accordance with the requirements
of Appendix A of this specification.
4.8.6 Ultrasonic examination.
4.8.6.1 Inspection equipment. The ultrasonic soundness inspection equipment shall
conform to ASTM A578/A578M.
4.8.6.2 Procedure. Unless otherwise specified in the contract or purchase order (see 6.2),
the ultrasonic examination shall be carried out in accordance with ASTM A578/A578M
(see 3.2.10.2) with the following exceptions.
(a) Scanning shall be continuous over 100% of the plate surface.
(b) Scanning rate shall be at a speed where recordable discontinuities can be
detected.
(c) The testing frequency shall be a minimum of 2 megahertz (MHz).
(d) Any area within a plate where a discontinuity produces a continuous total loss of
back reflection accompanied by continuous indications on the same plane
that cannot be encompassed within a circle whose diameter is 1 inch shall be
cause for rejection of that plate. All discontinuities shall be evaluated using a
frequency of 2 megahertz (MHz).
4.8.6.3 Certification of inspection personnel. Unless otherwise specified in the contract or
purchase order (see 6.2), personnel performing ultrasonic inspection shall comply with the
qualification requirements of NAS 410.
4.9 Reduced testing. At the discretion of the procuring activity, the amount of testing shall
be reduced provided the results on consecutive lots indicate that a satisfactory uniform
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