Civil Engineering Reference
In-Depth Information
TABLE 3.9
Typical Mechanical Properties for High-Strength
Graphite/Epoxy Unidirectional Composites with
V
f
= 0.6
Elastic Constants
GPa
10
6
psi
Longitudinal modulus,
E
L
145
21
Transverse modulus,
E
T
10
1.5
Axial shear modulus,
G
LT
4.8
0.7
Poisson's ratio,
v
LT
(dimensionless)
0.25
Strength Properties
MPa
10
3
psi
1240
180
Longitudinal tension,
F
L
tu
1240
180
Longitudinal compression,
F
L
cu
41
6
Transverse tension,
F
T
tu
170
25
Transverse compression,
F
T
cu
80
12
In-plane shear,
F
L
su
Interlaminar shear,
F
isu
80
12
Ultimate Strains
%
0.9
Longitudinal tension, ∈
tu
0.9
Longitudinal compression, ∈
cu
0.4
Transverse tension,
∈
tu
1.6
Transverse compression, ∈
cu
1-6
In-plane shear,
γ
u
LT
Density, kg/m
3
(lb/in.
3
)
1.58 × 10
3
(0.057)
Source:
Courtesy of Zweben (1989).
For the first three coupons,
A
=
0.104
× =
10.104
in
2
(67.1)
m
2
f
f
=
3.382
0.104
=
32.52
ksi
(224.3)
MPa
fu
f
fu
fu
E
== =
ε
32.52
0.0162
2007.4(13.85
ksi
GPa
)
f
Compared to 2010 ksi (13.867 GPa) measured at 60% of the rupture load.
For the other three coupons,
2
2
A
=
0.153
× =
10.153
in
(98.71
m
)
f
f
=
=
44.63
ksi
(307.9)
MPa
6.828
0.153
fu
f
fu
fu
E
== =
ε
44.63
0.0192
2324.4(16.04
ksi
GPa
)
f
Compared to 2326.3 ksi (16.05 GPa) measured at 60% of the rupture load.
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