Environmental Engineering Reference
In-Depth Information
TABLE 5.1
Small.Specimen.Static.Test.Results
Pultrusion(Averageof3to5
Specimens)Postcured
Graphite-EpoxyPrepregRequirements
-65°F
RT
160°F
250°F
-65°F
RT
160°F
250°F
Flexural.
@
200
272
213
130
Strength,.ksi.
(.95RT)
(.70RT).
(.65RT)
.
Flexural.
Modulus,.
(.95-
1.05RT).
16-18.
(.95RT).
(.65RT).
—.
17.1
15.8
13.4
psi.×.10
6
Interlaminar
Shear.
Strength,.
(.95RT).
12,000
(.70RT)
(.65RT)
—.
13500
11800
7600
psi
Tensile.
Strength,
Ksi
—
—
—
—.
192,0
188,3
189,0
—
Tensile.
Modulus,.
—
—
—
18,0
17,8
17,9
18,1
psi.×10
6
Transverse.
Tensile
Strain,.in/in
—
4,000
—
—
—
—
—
—
Note:
.@=.Based.on.60%.iber.volume.
TABLE 5.2
Value.of.the.Natural.Frequencies.for.the.Rotor.Blades
Radius,
m
Height,
m
k=R/h
f
11
x10
-4
f
22
x10
-4
f
33
x10
-4
h
2
.2
10
5.38
21.52
48.42
4
.2
20
5.28
21.12
47.52
6
.2
30
5.26
21.04
47.34
8
.2
40
5.26
21.04
47.34
.2
50
5.23
20.92
47.07
10
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