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Appendix A: Residual Stress Test procedure |
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|  MIL-C-70724(AR)
APPENDIX A
RESIDUAL STRESS TEST PROCEDURE
10.0 SCOPE
10.1 Scope. This appendix gives test procedure for
performing the residual stress test.
20.0 APPLICABLE DOCUMENTS
This section in not applicable to this appendix.
PURPOSE
30.0
30.1 Purpose. The residual stress test is performed to
determine if the residual stress in polyethylene cases is great
enough to cause splits or cracks in service or during long term
storage.
40.0
EQUIPMENT
Equipment. Equipment to be used shall be submitted to
the Government (see 6.3) for approval.
40.2 Test samples. Test samples shall consist of complete
sets of the quantity of parts specified with the exception of
propellant and primer (inert cartridge). Process the components
on the production line and assemble to meet all final assembly
dimensional requirements.
Heat resistant gloves shall be
40.3 Safety requirements.
worn when handling heated test samples and trays.
50.0 TEST PROCEDURES
The following test procedures shall
50.1 Test procedures.
be followed:
a. Immerse the test samples in the detergent. Seal
detergent coated samples in polyethylene bags to minimize
evaporation and place on an aluminum tray. Place the tray with
the sealed bags of test samples in an oven set at +160F 5F for
seven days.
b. After seven days remove the tray from the oven and
cool for one hour. Rinse the inert test samples in running water
to remove the detergent. Dry with clean rags or paper towels.
Coat the surfaces with machinist's dye and wipe with rags or
towels removing all excess dye on the surfaces.
A-1
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