Mounting the Extensometer
2-5
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Mounting the Extensometer
Extensometers are clamped to the specimen
by special high tear strength rubber bands or
tension springs, pulled tight enough to
prevent knife edge slippage during testing. If
heating of the specimen is expected, then the
springs should be used instead of the rubber
bands. The extensometer is mounted on
either the test specimen or the calibration
fixture in exactly the same manner. The
mounting sequence is illustrated in
Figure 2-1.
When using the rubber bands as clamping
devices, it may be necessary to double-loop
the bands on smaller diameter specimens to
obtain enough clamping force. Figure 2-1
shows an extensometer mounted with rubber
bands.
A magnetic mounting cleat is provided in the
extensometer kit of parts to support the
extensometer cable. It should be positioned
on the frame adjacent to the extensometer
assembly, such that the full weight of the
cable is removed from the extensometer to
prevent strain measurement errors.
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