​
stress (kPa)
5.
initial height of foam a (mm)
h
a
20.
coefficients for foam a
c
1a
(kPa
-1
)
3.2
c
2a
0.4
c
3a
0.75
initial height of foam b (mm)
h
b
10.
coefficients for foam b
c
1b
(kPa
-1
)
4.6
c
2b
0.45
c
3b
0.7
initial height of foam c (mm)
h
c
5.
coefficients for foam c
c
1c
(kPa
-1
)
2.2
c
2c
0.3
c
3c
0.8
axes maxima
strain max.
1.
stress max.
20.
engineering strain
delta height (mm)
foam a
0.56
11.
foam b
0.38
4.
foam c
0.75
4.
stacked foams
0.54
19.
0.0
0.2
0.4
0.6
0.8
1.0
0
5
10
15
20
strain
stress (kPa)
compression of foams a, b & c
0.0
0.2
0.4
0.6
0.8
1.0
0
5
10
15
20
strain
stress (kPa)
compression of stacked foams