MIL-P-70679 (AR)
4.4.3.4. Providing ground (maximum average pressure) test.
Samples provided in accordance with Table I and 4.4.2.3 will be
subjected to this test. Defect classification and individual
accept/reject criteria shall be in accordance with Table II. The
test shall be conducted in accordance with 4.4.5.6.
TABLE II Proving Ground Test
Accept/Reject
Defect
Category
Premature burst, metal part
Critical
breakup or deformation due
1
0
to launch forces
Horizontal range less than
Major
1
0
80% of average range
4.4.4 Inspection equipment. The inspection equipment required
to Perform the examinations and tests prescribed herein is described
in the "Paragraph Reference/Inspection-Method" column in the tables
starting with paragraph 4.4.2. The contractor shall submit for
approval inspection equipment designs in accordance with the terms
of the contract. See Section 6 of MIL-A-48078 and 6.3 herein.
4.4.5 Methods of inspection.
4.4.5.1
Mechanical properties.
(See 4.4.3.4). The test shall be
4.4.5.1.1 Hardness test.
performed using any automated hardness tester which will produce
accurate repeatable results with readings for an acceptable
projectile between 25-80% of the full scale capability of the test
equipment. When the Brinell hardness test is used equipment and
procedures shall be as prescribed in ASTM Method E-10, except that
the minimum dwell time shall be 5 seconds, otherwise operating
procedures shall be as specified by the applicable equipment manual,
standard ASTM test methods and the following subject to approval by
the Government representative:
a. The surface of the body in the area to be hardness tested
shall be prepared by machining or grinding to a sufficient
(Note: Impressions shall be completely
decarburization zone.
removed by machining of the obturating band groove or final
machining.)
b. The hardness tester calibration shall be tested at start up,
at least once each four hours of continuous operation or after a
layoff of three or more hours.
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