MIL-DTL-46100E (MR)
3.2.5 Mechanical properties.
3.2.5.1 Hardness. The surface hardness of each plate, including first article samples, shall
be within the range of HB 477 - HB 534. The diameters of Brinell hardness impressions on
any individual plate shall not vary by more than 0.15 mm (see 4.8.2).
3.2.5.2 Impact resistance. The minimum Charpy V-notch impact resistance requirement of
the armor plate shall be as shown in Table II. The Charpy V-notch specimens shall be
obtained in both the TL orientation (i.e., transverse to the major direction of rolling with the
notch perpendicular to the plate surface so that the crack shall propagate in the longitudinal
direction) and the LT orientation (i.e., parallel to the major direction of rolling).
TABLE II. Minimum Charpy V-notch impact resistance requirements at -40°F ± 2°F.
SPECIMEN
IMPACT RESISTANCE FOR STANDARD DEPTH
ORIENTATION
SPECIMENS (ft. lbs.)
Standard width 3/4 width
1/2 width
1/4 width
Transverse (T-L)
12.0
9.0
6.0
3.0
Longitudinal (L-T)
14.0
10.5
7.0
3.5
3.2.6 Bend test. All bend test samples from that lot shall be capable of being bent to the
requirements specified in Table III without cracking as determined by visual inspection for
thicknesses of 0.500 and under. When specified in the contract or purchase order (see 6.2),
the bend test shall be performed on material thicker than 0.500 inch. Dimensions for
thickness over 0.500 inches are listed in Table III for information purposes only. Two bend
test samples shall be tested in the transverse direction per ASTM E290, transverse bend
test, at room temperature through an included angle of 90° (unrestrained) to the inside radii
shown below. After bending, samples shall be free of cracks as determined by visual
inspection unless otherwise specified in the contract or order (see 6.2).
TABLE III. Bend test requirements.
PLATE THICKNESS (T)
INSIDE RADIUS
0.118 to 0.3125
4T
Over 0.3125 to 0.500
6T
Over 0.500 to 0.750
8T
Over 0.750 to 1.000
10T
Over 1.000 to 2.000
12T
3.2.7 Ballistic requirements. Ballistic requirements shall be in accordance with the
Appendix A of this specification.
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