Civil Engineering Reference
In-Depth Information
TABLE 3.8
Typical Mechanical Properties for S-Glass/Epoxy
Unidirectional Composites with
V
f
= 0.6
Elastic Constants
GPa
10
6
psi
Longitudinal modulus,
E
L
55
8.0
Transverse modulus,
E
T
16
2.3
Axial shear modulus,
G
LT
7.6
1.1
Poisson's ratio,
v
LT
(dimensionless)
0.28
Strength Properties
MPa
10
3
psi
1620
230
Longitudinal tension,
F
L
tu
Longitudinal compression,
F
L
cu
690
100
40
7
Transverse tension,
F
T
tu
Transverse compression,
F
T
cu
140
20
80
12
In-plane shear,
L
su
F
Interlaminar shear,
F
isu
80
12
Ultimate Strains
%
2.9
Longitudinal tension, ∈
tu
1.3
Longitudinal compression, ∈
cu
0.4
Transverse tension,
∈
tu
1.1
Transverse compression, ∈
cu
1-6
In-plane shear, γ
LT
u
Density, kg/m
3
(lb/in.
3
)
2.0 × 10
3
(0.073)
Source:
Courtesy of Zweben (1989).
Example 3.2
Two test panels were fabricated, one using one ply only and the other one using
two plies of an E-glass fiber/epoxy unidirectional FRP system with the wet lay-up
technique (Wuertz 2013). Based on the manufacturer's data sheet of this FRP sys-
tem, the net fiber area is 0.043 in.
2
/in. (1.092 mm
2
/mm) width per ply. After the
system has cured, three 1-in. (25.4 mm)-wide test coupons are cut from the single-
ply panel (GFRP-1, GFRP-2, GFRP-3), and three 1-in. (25.4 mm)-wide test coupons
are cut from the two-ply panel (GFRP-4, GFRP-5, GFRP-6). The test coupons are
tested in tension to failure according to ASTM D3039. Table 3.14 presents the
results of the tension tests. Determine the average tensile properties based on the
composite laminate and the net fiber area.
Solution:
Properties for the composite laminate:
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