Strain Rate - Instron 4400 Series Operator's Manual

Strain Rate

For certain materials, the specimen strain rate is speci-
fied rather than a testing speed. But once the gauge
length (G.L.) has been established, the testing speed can
be calculated from the strain rate.
Testing Speed = Strain Rate x G.L.
EXAMPLE:
Specimen: Plastic film
Gauge length: 10 in. (250 mm)
Strain rate (from designated test procedure):
0.5 in/in/min (0.5 mm/mm/min)
Testing speed = 0.5 in/in/min x 10 in. (250 mm)
Therefore, in this example, perform the tensile test on
the film at 5.0 in/min (125 mm/min).
= 5.0 in/min (125 mm/min)
Strain Rate
A-9