(kg/ cm2) (lb / in.2)
20
280
5.0
0
0.5
0.2
in. / min
240
0.005
16
B.00049
Treak Point
200
est Stopped
12
160
120
8
80
4
40
10F (23C)
72F (22C)
0
0
0
100
200
300
400
0
100
200
300
400
Elongation (%)
Figure 12. Karpati's (1972b) results showing the effect of deformation rate on the
nominal stresspercent elongation response of silicone butt joint seal specimens.
to the lower temperature. Karpati reported that
from the polymers field to interpret the responses
the polysulfide sealant material had a glass transi-
of model structures (Karpati 1972c, 1973). Karpati
tion temperature of 46C (50F). The results
recognized that the model seals have "an extremely
also show stiffer responses for the higher defor-
complicated stress field" (Karpati 1972c), citing the
mation rates.
work of Catsiff et al. (1970b), and chose the geom-
Karpati did not conduct material property tests.
etry of a single structure for her work. Although
She did, however, apply material property con-
Karpati's results provide insight into the material
cepts of temperature and strain-rate dependence
behavior, as suggested by Catsiff et al. (1970a), it
(kg/ cm2) (lb / in.2)
20
280
cm/ min
in. / min
1
5.000
0
1.969
0.000
0.394
240
0.5000
0.1969
16
0.1000
0.0394000
0.05000
0.01969
200
0.01000
0.00394
0.005000
0.001969
12
.0005000
.0001969
160
T
Break Point
est Stopped
120
8
80
4
40
T = 30F (34.4C)
T = 73F (22.8C)
0
0
0
100
200
300
400
0
100
200
300
400
Elongation (%)
Figure 13. Karpati's (1972b) results showing the effect of deformation rate on the
nominal stresspercentage elongation response of polysulfide butt joint seal speci-
mens.
15
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