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|  MIL-G-47316A (MI)
b. Balance the potentiometer according to the manufacturer's instructions.
c. Use specimens A for with-the-grain determinations and specimens B for
across-the-grain determinations (see figure 1).
d. Place a weight of approximately five pounds on the center of the specimen
to assure contact of the potential points.
e. Determine the current passing through the test specimen.
f. Determine the voltage drop across the potential points.
g. Calculate specific resistance as follows:
Specific resistance, 10-4 ohm-cm = E x A
I x L
Where:
A = cross-sectional area, square cm
L = length of conductor, cm
E = potential difference, volts
I
= current, amperes
h. Report the average of the results for specimens A (with grain) and the
average for specimens B (across grain) for each block or billet.
4.6.4 Flexural strength. Flexural strength (see 3.3.3) shall be determined in
accordance with ASTM C 651 and the following:
a.
Optional construction of the loading head and bed of the testing machine
shall be permissible provided the distances between supports and points
of load application are maintained and the application of load and
directions of reactions are not affected.
b.
The contact surface of each load applying and load receiving block shall
be cylindrical or have a 0.03 inch wide flat surface. (No sharp edges are
permitted.)
c.
Only specimens that fracture within the middle third of the span length
shall be considered valid tests.
d.
Use specimens A for with-the-grain determinations and specimens B for
across-the-grain determinations.
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