Environmental Engineering Reference
In-Depth Information
Coorelation between fatigue strength and the number of
cycles in harmonic bending of graphite/epoxy composites
40
Series 1
30
Series 2
20
Series 3
Series 4
10
0
1
2
3
4
5
Number of cycles
6
7
8
9
10
11
FIGURE 5.8
Fatigue.strength.prediction.correlations.with.compression.strength.
TABLE 5.5
Fatigue.Interlaminar.Shear.Strength.Prediction.for.Graphite/Epoxy.Composites.
(First.Approach)
τ
s*
10
-3
MPa/
psi
τ
s*
10
-3
MPa/
psi
S
τ
*10
-3
MPa/
psi
τ
-1*
10
-3
MPa/
psi
t
1
P(t
1
)
Φ
(t
1
)
.07/10.4
.692
.3144
.685
7.12
.07/10.2
.384
.3711
.628
6.41
.068/10
.068/9.95
.004/.65
.076
.3980
.602
6.02
.067/9.8
.230
.3885
.611
5.99
.066/9.7
.384
.3711
.628
6.09
.066/9.6
.538
.3448
.655
6.28
5.8.5
Concluding Remarks
.
1.. A.methodology.for.the.prediction.of.the.fatigue.strength.of.anisotro-
pic.materials.like.iberglass,.carbon/epoxy,.and.hybrid.matrix.com-
posites.was.developed.
.
2.. Probability. of. local. cracking. can. be. predicted. using. mathemati-
cal. functions;. the. irst. and. second. approach. the. law. of. normal.
distribution.
.
3.. In. spite. of. the. visibility. of. cracks,. the. samples. have. a. general.
strength..However,.it.is.very.important.to.use.nondestructive.evalu-
ation.methods.for.the.determination.of.cracks.that.are.not.visible.
Search WWH ::
Custom Search