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Page Title:
Ultimate strain and yield stress tests |
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|  MIL-P-82691A (OS)
Specific gravity test. The specific gravity of the
cured
4.7.1.1
be determined by the sink-float
propellant
shall
test
Zinc
solutions shall be used in this determination in
0. 002
chloride
increments. The value of the specific gravity of the cured
prope-
llant
shall be the specified gravity of the zinc chloride
sol u-
tion in which the sample of propellant just floats.
4.7.1.2 Ultimate strain and yield stress tests. A minimum of two
specimens
sample. 1 e.
test
shall be cut from each propellant
Each
shall be five inches minimum in length and
specimen
0.1000.050
inch in
Using Die C of
ASTM
thickness as shown in FIGURE IA.
D412, cut dumb-bells from the specimens as shown in FIGURE IB.
Three thickness measurements shall agree within 0.010 inch for
acceptable specimens. Reject any specimen that has surface imper-
fections
or
Replace unacceptable samples from the
15 damaged.
same propellant sample.
The testing machine shall have a recor-
der,
adjustable velocity and constant-rate-of-crosshead-movement
for
performing the ultimate strain and yield stress
tests.
The
rate shall be O. 10 inch per minute prior to yield
crosshead
and
The average
20 inches per minute from yield to the break point.
values shall be compared to Table I values for compliance.
FIGURE 1. Vibration set-up
6
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