JOTP-011
5 December 2014
APPENDIX A. BACKGROUND/RATIONALE
ANNEX 1. ENVIRONMENTAL TESTS
A.1-1.4 Temperature Stabilization.
For environmental tests that require temperature conditioning, temperature stabilization is
achieved when the part of the item considered to have the longest thermal lag is changing no more
than 2 °C per hour. Since it may not be practical to monitor the interior parts of a live munition
with the longest thermal lag during test without damaging seals, the stabilization time may be
determined prior to live munition testing using an instrumented thermally equivalent inert
munition. The stabilization time will typically be required for the munition in both the unpackaged
and the transport configurations and at the hot and cold temperature extremes. As an alternative,
see Table A-1 for minimum stabilization time values. Care should be taken that no item exceeds
the safe life of the energetic material when subjected to multiple exposures of high temperature
conditioning.
TABLE A-1. DEFAULT TEMPERATURE STABILIZATION TIMES
Minimum
Munition
Temperature
Diameter (D)
Configuration
Stabilization Time
(cm)
(hours)
Unpackaged
12
D ≤ 12.7
Packaged/Palletized
24
Unpackaged
24
12.7 < D ≤ 25.4
Packaged
36
Unpackaged
48
25.4 < D ≤ 38.1
Packaged
60
Unpackaged
60
> 38.1
Packaged
72
A.1-1.5 Solar Radiation Equivalent (SRE) Temperature.
As an alternative to installing solar lamps in a vibration test chamber, the solar radiation equivalent
(SRE) temperature is specified in most mechanical environment tests in order to facilitate testing.
The SRE is the maximum temperature value experienced by the energetic material (e.g., rocket
motor propellant, warhead main charge) after exposure to direct or indirect solar radiation.
Determination of this value will require exposure of an inert, internally instrumented munition,
with similar thermal characteristics to the complete round, to the full solar test requirement defined
in Appendix C, Annex 1, Paragraph C.1-5. The SRE temperature should be determined for both
the packaged and unpackaged state, and applied for all mechanical environment tests such that the
A.1-2
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