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Appendix B: Residual Stress Test Procedure |
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|  MIL-C-70725A (AR)
APPENDIX B
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 is not applicable to this appendix.
30.0 PURPOSE
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 used in this test shall be
40.1 Equipment.
approved by the Government prior to testing.
40.2 Material. Detergent, Nonylphenoxy Poly. (Ethyleneoxy)
Ethanol is required for this test.
Test samples shall consist of complete
40.3 Test samples.
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.
40.4 Safety requirements. Heat resistant gloves shall be
worn when handling heated test samples and trays.
50.0 TEST PROCEDURES
50.1 Test procedures.
The following test procedure shall
be followed:
a. Immerse the test samples in the detergent. Seal
the detergent coated samples in a polyethylene bag to minimize
evaporation and place them in an aluminum tray. Place the tray
with the sealed bags of test samples in an oven set at 160F
5F for seven days.
B-1
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