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Veloce 50 Operating Manual
12
The relative strain value is expressed by the following equation:
)()()(
0
ttt
r
ε
ε
ε
=
where:
)(t
r
ε
is the relative strain as fonction of time
)(t
ε
is the absolute or true strain as fonction of time
)(
0
t
ε
is the absolute or true strain at time t
0
Time
Time
Time
0
Relative strain
Measurement s start ed here
Measurement s st art ed here
A
bsolute or
true strain
0
0
Example 2
RELATIVE STRAIN MEASUREMENTS
t
0
t
0
ε
(
t
)
ε
(t
0
)
ε
r
(
t
)
Relative strain
ε
r
(
t
)
Example 1
Figure 5. Schematic explanation of relative measurements.
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