Dynamic Strength - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 148

5

R = 0.1
R = -1
R = 10

4

3

2

1

0

1 10 100 1000 10000

Number of cycles

100000 1e+06 1e+07 1e+0

FIGURE 5.7
The.Wohler.diagram.showing.50.percent.regression.lines.based.on.data.from.the.OPTIMAL.
database.

TABLE 5.3
Fatigue.Compression.Strength.Prediction.for.Graphite/Epoxy.Composites

Fatigue
Strength
MPa/psi

σ s* 10 -3
MPa/psi

σ m* 10 -3
MPa/psi

S j* 10 -3
MPa/psi

Parameter
t

Φ (t)
σ -1* 10 -3 P(t)

.37/54 .412 .3668 .6332 .24/34.2

.36/52 .24 .3885 .6115. .22/31.8

.34/50 .34/49.16 .024/3.46 .07 .3980 .6000. .20/30.0

.33/48 .009 .3989 .6010. .198/28.8

.32/46 .025 .3876 .6124. .19/28.17

.31/45 .035 .3765 .6235. .19/28.05

TABLE 5.4
Density.of.Probability.Function.(First.Approach)

t 0 1 2 3 4 5 6 7 8 9

0,0 3989 -4 3989 3989 3988 3986 3985 3998 3980 3977 3973

0,1 3970 -4 3965 3961 3956 3951 3945 3939 3932 3925 3918

0,2 3910 -4 3902 3894 3885 3876 3867 3857 3847 3836 3825

0,3 3814 -4 3802 3790 3778 3765 3752 3739 3726 3711 3697

0,4 3683 -4 3668 3653 3637 3621 3605 3589 3572 3555 3538

0,5 3521 -4 3503 3485 3467 3448 3429 3410 3391 3372 3352

0,6 3332 -4 3312 3292 3271 3251 3230 3209 3187 3166 3144