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A 250-mm chart record is desired for the expected test
1
duration of
/
-minute (time expected to reach ultimate
2
extension). Therefore, the chart time axis should travel
500 mm in 1 minute, and a chart speed of 500 mm/min
is required. Then:
⁄
mm
500
min
= 2
M =
⁄
min
250
min
Each millimeter of chart, along the time-drive axis, will
indicate:
1
1
=
= Crosshead Displacement (mm)
M
2
To determine the percentage of total strain directly from
the chart:
Chart displacement x 100
% Strain =
M x Gauge length
Chart Magnification
A-15
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