MIL-DTL-46118E(MR)
largest of the round subsize proportional specimens shown in ASTM B557 which
can be obtained shall be used. Longitudinal tension test specimens shall be
taken with the long axis parallel to the direction of maximum metal flow.
Transverse specimens shall be taken with the long axis perpendicular to the
direction of maximum metal flow. Actual location shall be as specified on the
drawing or in the contract or order (see 6.2).
4.6.3 Stress corrosion. The stress corrosion specimens shall be stressed
at 75% of the specified yield strength.
4.7
Test procedures.
4.7.1 Chemical analysis. Chemical analysis shall be conducted in
accordance with the applicable methods specified in ASTM E34 or E227, E607, or
E1251 of ASTM E716. The analysis shall comply with the declared composition
established in accordance with the requirements of table I (see 3.2).
4.7.2 Mechanical properties. The mechanical properties shall be
determined in accordance with ASTM B557.
4.7.3 Capability requirements for resistance to stress corrosion. When
stress corrosion testing is specified, the test shall be conducted in
accordance with ASTM G47. The location of the specimens taken from die
forgings shall be specified in the forging drawing.
4.7.4
Ballistic tests.
(a) Rolled plate. Prior to testing, the plates shall be temperature
conditioned (see Appendix A, A.4.2). Plates shall be tested using projectiles
chosen in accordance with the thickness ranges shown in table V. Plate
thickness as determined by the ballistic test agency shall be used to
determine the required ballistic limit for that plate. Individual thickness
measurements are to be read from a deep throat micrometer or by means of an
ultrasonic device to the nearest 0.001 inch and the average of these readings
reported to the nearest 0.005 inch. Measurements shall be made on the
intended impact area.
TABLE V. Acceptance ballistic test plates or forgings.
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Ordered or nominal design
thickness specified on
Projectile
drawings, inches
to be used
0.700-0.950
Cal. .50 FS
0.951-1.550
20 mm FS
1.551-3.000
Cal. .50 AP, M2
3.001-4.000
14.5 mm API, BS41
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(b) Forged shapes. Prior to testing, the forgings shall be
temperature conditioned (see Appendix A, A.4.2). Ballistic test forgings
shall be tested at locations specified (see 6.2). Forgings shall be tested
using projectiles chosen in accordance with thickness ranges shown in table
A-IV. Unless otherwise stated, required minimum ballistic limit protection
shall be the measured thickness of the forging.
4.7.5 Forging thickness measurements. The average thickness of the
forging shall be the mean of at least 4 thickness measurements read to the
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