TA Instruments RSA-G2, Руководство пользователя

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Creep and Recovery on Soft Foam
1.4
2000
1.2
1.0
1500
,......
(f)
oJ< 0.8
-+
ii3
'-'
C
Q
+-
(f)
1000
0.6
0.4
500
Temperature: 25· C
0.2 Strain: 2000 Pa
Compression
0
0
0 20 40 60 80 100 120
Time
(
s
)
Here is an example of creep and recovery for a soft foam material in
compression. A stress of 2. 000 Pa was applied for 60 s and strain recovery
was monitored for 60 s.
C/)
C/)
,......
"'0
0
'-'
Testing Modes and Applications
23
,......
0
0...
'-'
en
:l
'5
'0
0
2
c
0
:;::::
0
X
0
a>
C!:::
Stress Relaxation on PDMS
106
105
104
103
102
Temperature:
25
•
C
101
Strain:
5%
Shear Sandwich
10°
10-3 10-2 10-1 10° 101 102 103
Time
(
s
)
This figure shows the stress relaxation modulus for PDMS in a shear
sandwich clamp at 25 ·C and 5% strain. G
e
t
)
is calculated from the time­
dependent stress decay divided by the applied strain and provides a
quick and easy way to directly measure relaxation times in materials.