Civil Engineering Reference
In-Depth Information
For determination of the strain present in each element at a certain time (for dif-
fuse model), experimental analysis of the local strains at failure (summarized in
Table
6.1
for the center of the specimen) was linearized from time zero to the
time at which the fracture occurred. Figure
6.3
(left) shows the averaged strain in
the length, width, and thickness directions from the experimental testing results
at failure for Parameter Set 4, which is defined in Table
6.2
of the subsequent
“Experimental Setup” section. In Fig.
6.3
(right), the corresponding strain input
for the length strain is depicted as an example.
Table 6.1
Fracture strains for specimen center
Center of specimen
Final length strain
Final width strain
Final thickness strain
0.35
−
0.27
−
0.08
Parameter set 1
Parameter set 2
0.43
−
0.32
−
0.11
0.30
−
0.22
−
0.08
Parameter set 3
0.39
−
0.26
−
0.13
Parameter set 4
Fig. 6.3
Linearized experimental strain data for parameter set 4 at failure (
left
) and correspond-
ing input length strain surface (
right
) [
4
]
Table 6.2
Tensile testing conditions
Parameter
set
Current
magnitude (A)
Initial current
density (A/mm
2
)
Pulse
duration (s)
Pulse
period (s)
Duty
cycle (%)
Wave
shape
0
0
n/a
n/a
n/a
n/a
0
1
800
64
0.3
60
0.50
Square
800
64
0.5
60
0.83
Square
2
500
40
0.5
60
0.83
Square
3
4
500
40
1.0
60
1.67
Square
