Design Wind Power Turbine - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 52

Fiberglass cover

P uniform load

Carbon
inner web

Y

h1 h

a1
a

Deflection of hybrid cantilever bar with elliptic section

FIGURE 2.24
Delection.of.hybrid.cantilever.bar.with.elliptic.section.

Here:
E s 11,. E s 22,. G s 12,. μ s 12 ,. μ s 21 . are. the. modulus. of. normal. and. shear. elasticity. and.
Poisson's.of.ratio.for.skin.layers.in.axial.and.transverse.directions;
E h 11,. E h 22,. G h 12,. μ h 12 ,.μ h 21 .are.the.modulus.of.normal.and.shear.elasticity.and.
Poisson's.of.ratio.for.inner.webs.in.axial.and.transverse.directions.
h 1 ,.h 2. are.the.thickness.of.skin.and.inner.web.layers.

Moment.of.inertia.iberglass.cover.relative.axis.x.is:

. I FC. =.1/4π.(ah 3. -.a 1 h 1 3 ). (2.64)

Moment.of.inertia.iberglass.cover.relative.axis.y.is:

. I FC. =.1/4π.(ha 3. -.h 1 a 1 3 )

Moment.of.inertia.carbon.inner.webs.relative.axis.x.is:

. I CW. =.a 1 h 1 3 /12.

Moment.of.inertia.carbon.inner.webs.relative.axis.y.is:

. I CW. =.h 1 a 1 3 /12

Stress.function.F.(Equation.(2.3.26)).is.a.maximum.delection.of.wind.tur-
bine.blade.(F.=.ω): 4

F(x,y) = Q
8I

1
3 λ λ

[ x -k(y-

2

α )2(y - )] [y + β

a (b-1+4q)]

.

Here:
Q.represents.the.external.dynamic.load,.which.has.been.acted.upon.in.the.
center.of.the.point.of.hydrodynamic.stress.function;