Design Wind Power Turbine - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 49

TABLE 2.2
Strength.of.Fiberglass

Load
Direction X Y Z X 45 Y 45 Z 45

Tensile 69/1025 46/683,6 2,3/34,18 23/341,8 4,6/68,4 4,6/68,4

Compression 50,6/752 34,27/509,2 64,6/960,4 19,2/285,4 22,31/331,5 22,31/331,5

Shear S 12 45

15/222,17

S 23 45
15/222,17

S 13 45
15/222,17

TABLE 2.3
Parameters.for.Related.Strength.of.Fiberglass

Load
Direction c b d p r s t f

Tensile 1.50 30.0 4.60 4.60 4.60 11.36 7.76 -17.14

Compression 1.47 .785 3.38 3.38 3.38 7.68 7.48 8.365

Following.Goldenblat.and.Kopnov, 22 .the.thickness.of.the.cross.section.thin.
tube-h.depends.on.torsion.moment-T.

T
2A x τ .

h =

. (2.57)

where
A.is.the.area.enclosed.by.the.center.line.of.tube,
t xy. is.the.shear.stress.of.any.sections.

Twist. (torsion). moment. change. from. the. wind. direction. and. reinforced.
iber.is.very.important.(Figure 2.22).

2.10.3.1 Experimental Results

We. selected. boundary. conditions. for. wind. turbine. blade;. the. thickness. of.
the. shell. blade. takes. place. in. biaxial. stress. conditions. s x. and. s y ,. following.
Goldenblat.and.Kopnov: 22

σ + σ

R
h

x y

s

=

. . .(2.58)

p

Here:
σ x ,σ y ..=.stresses.acting.in.longitudinal.and.axel.directions;
p.. . =.hydrostatic.wind.pressure,