Calculating Elongation - Astm D - Elcometer 1510 Gebrauchsanleitung

3 TESTING A SPECIMEN (continued)
5. Hold the bending lever firmly, and with a smooth action, swing
the bending lever away from the specimen clamp until it reaches
its stop position.The specimen will now be bent into a conical 'U'
shape.
6. Using a magnifier if necessary, inspect the coating for cracks in
accordance with the requirements of the test standard. Mark the
end of the crack furthest from the narrow end of the mandrel.
The diameter of the mandrel at this point can be determined
from the scale marked on the specimen clamp.
7. Swing the bending lever back towards the specimen clamp until
it reaches the stop position and then release the specimen from
the specimen clamp and remove.
8. Measure and record the length of the crack from the narrow end
of the mandrel.
Repeat the test on two further specimens and calculate the average
of the three results.

4 CALCULATING ELONGATION - ASTM D 522

If required, use the curve shown in Figure 2
elongation of the coating.
Figure 2. Crack length versus % elongation - Cold rolled steel,
0.8 mm (1/32") thick, 25 µm (1 mil) coating
a. The curves shown in Figure 2 and Figure 3 are reproduced from ASTM D 522
en-5
R
to determine the
a
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