terminates its development. Table XVII presents a list
of the tests to be performed and the number of units and
cartridges required for each evaluation. Since some
the design for the second phase of the prototype
units can be used more than once, about 40 must be
evaluation program: performance evaluation.
fabricated for the complete program.
(3) Performance evaluation program.
b. Structural Evaluation.
A minimum of two
(a) Performance evaluation of the prototype
devices are subjected to maximum tension and
design is the final phase in the
compression loads at -65 70 and 200F. after which
,
,
development evaluation program.
A
the trunnions and initial looks are inspected for
sufficient number of prototype models
deformation.
must be fabricated to permit the program
c. Endurance Evaluation. Two units are subjected
described below.
to cycling tests if the design requirements specify that
(b) At least 10 firings at each temperature, -
the units will be subjected to alternating tension and
65 70 and 200 F., are conducted to
,
,
compression loads. In these evaluations, 3,000 cycles
ensure that the performance of the device
of tension and compression loads are applied to each
meets design requirements. To check
device. Each cycle consists of one maximum tension
ignition and the action of the firing
load and one maximum compression load.
mechanism below the lowest specified
d. Demagnetization Evaluation. All units submitted
temperature, at least 10 firings are
for qualification and analysis evaluation are checked for
conducted at -90 F. These are usually
freedom from residual magnetism resulting from the
done using only the cartridge and firing
manufacturing process.
mechanism portion of the device.
e. Hydrostatic Evaluation. All units submitted for
(c) At least two prototype models are
qualification and analysis evaluation are subjected to
fabricated with their chamber walls
hydrostatic tests. The pressure chambers or tubes are
machined to the minimum thickness
mounted in a test fixture and subjected to internal
specified on the parts drawing. These
pressures above the maximum pressure expected
units are conditioned at 200F. and fired
during service. The pressure is maintained for several
locked shut. If no-load requirements are
seconds, during which the chambers or tubes are
specified, several units are tested at -65
inspected for leaks. After each test, the chambers and
and 200F. under no load, and the units
tubes are inspected j for dimensional conformance.
are inspected for permanent deformation.
f. Torque Evaluation. A minimum of two devices
(d) Four prototype units are subjected to
are checked for conformance with the torque
environmental conditioning.
These
requirements of threaded joints, as specified. The
evaluations include vibration, high- and
breakaway torque and running torque (if applicable) are
low-temperature,
temperature-shock-
measured for each unit. The units are assembled and
cycling, and temperature-altitude-humidity
disassembled and the torque measured again on the
tests.
fifth, tenth, and fifteenth disassembly of each threaded
(e) A new development program must be
joint.
initiated if a failure occurs during any
g. Environmental Evaluation.
evaluation and a design modification is
(1) Six assemblies are subjected to vibration
necessary.
The completion of the
tests, after which two units are
development program qualifies the device
disassembled and inspected for damage.
for qualification and analysis evaluation
All six assemblies then are subjected to
(also referred to as final engineering
salt-spray, sand-and-dust, high- and low-
evaluation).
temperature,
and
temperature-shock
evaluations.
The 6 units and 15
96. Qualification and Analysis Evaluation Program .
additional cartridges are exposed to
a. General. The qualification and analysis program
cycles of temperature, altitude, and
qualifies a propellant actuated device for use and
humidity as illustrated graphically in figure
102. The device is exposed to the same
cycle of temperature and pressure
(altitude) for 5 days. On the seventh hour
of the first day, moisture is introduced into
the test
112
