Civil Engineering Reference
In-Depth Information
TABLE 3.12
Typical Mechanical Properties for Kevlar 49 Aramid/Epoxy
Unidirectional Composites with
V
f
= 0.6
Elastic Constants
GPa
10
6
psi
Longitudinal modulus,
E
L
76
11
Transverse modulus,
E
T
5.5
0.8
Axial shear modulus,
G
LT
2.1
0.3
Poisson's ratio,
v
LT
(dimensionless)
0.34
Strength Properties
MPa
10
3
psi
1240
180
Longitudinal tension,
F
L
tu
230
33
Longitudinal compression, “yield,”
F
L
cy
Longitudinal compression, ultimate,
F
L
cu
280
40
Transverse tension,
F
T
tu
30
4.3
Transverse compression,
F
T
cu
140
20
60
9
In-plane shear,
F
L
su
Interlaminar shear,
F
isu
60
9
Ultimate Strains
%
1.6
Longitudinal tension,
∈
tu
0.3
Longitudinal compression, “yield,”
∈
cy
>2.0
Longitudinal compression, ultimate, ∈
cu
0.5
Transverse tension, ∈
tu
2.5
Transverse compression, ∈
cu
In-plane shear, γ
LT
1-6
u
Density, kg/m
3
(lb/in.
3
)
1.38 × 10
3
(0.050)
Source:
Courtesy of Zweben (1989).
For the first three coupons:
A
=
0.104
× =
1 .104in (67.1)
2
mm
2
f
fA
nw
32.52 0.104
11
×
×
fu
f
f
p
=
=
=
3.382k/
in
/
ply
(0.593
kNmmply
/
/
)
fu
For the other three coupons:
2
2
A
=
0.153
× =
10.153in (98.71
mm
)
f
fA
nw
44.63 0.153
21
×
×
fu
f
p
=
=
=
3.414k/
in
/
ply
(0.598
kNmmply
/
/
)
fu
f
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