NDE Digital Methods for Predicting Stiffness and Strength of Wind Turbine Blades - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 173

TABLE 6.6
Properties.for.Carbon-Carbon.Composites

Normal
strength,
of
thermal
expansion
MPa/psi

Modulus,
ofelasticity
actinginx,z
directions
MPa/psi

Shear
strength
MPa/psi

Coeficient
cm/cmCo

Signiicance E11 E22 s b1 sb2 t .b12 a 1 a. 2

Compression .8*105/.

12,3*106.

.65*105/.
9.5*106

135.8/.
19.700

116.5/.
16.900

9.37/.
1360

.118 .115.

Tension .83*105.

12.1*106

.71*105/.
10.3*106

226/.32.800 172/.

24.970

9.37/.
1360

.118 .115

TABLE 6.7
Parameters.Relationship.to.Strength.for.Carbon-Carbon.Composites
Signiicance

c b d s h

Compression 1.16 12.43 14.48 -12.34. -10.87

Tension 1.31 18.36 24.1 -21.86 -17.17

Launched.in.April.2001,.NASA's.Mars.Odyssey.is.now.prepared.to.collect.
data.that.will.offer.insights.into.the.makeup.and.history.of.the.Red.Planet..
With.the.spacecraft's.20-ft.boom.successfully.deployed,.two.neutron.detec-
tors.and.the.gamma.ray.spectrometer.(GPS).mounted.on.its.end,.the.space-
craft.can.measure.the.quantity.and.distribution.of.primary.elements.located.
at.or.near.the.planet's.surface.and.also.the.modulus.of.elasticity.of.the.pri-
mary.elements.
Additionally,.silicon,.oxygen,.iron,.magnesium,.potassium,.aluminum,.cal-
cium,.sulfur,.and.carbon.are.among.the.20.primary.elements.being.measured.
NASA's. Marshall. Space. Flight. Center. (MSFC). has. tested. Raytheon's.
Radiance.infrared.camera.to.devise.NDE.methods.for.assembling.assorted.
aerospace.components.
These.NDE.techniques.had.been.used.for.any.structural.anomaly.determi-
nations.for.composites.on.the.Space.Shuttle.nose.cap.and.the.Radiance.system.
was.used.for.the.thermography.component.because.the.camera's.256.×.256-
pixel. InSb. (indium. antimonide). standing. focal. plane. array. generates. high-
resolution.images.and.is.highly.sensitive.to.slight.temperature.changes. 14
Thermoforming. technology. includes. prepreg. layup. layers,. a. curing. pro-
cess. with. monitoring. parameters,. pressure,. temperature. of. polymerization.
time,.and.a.cooling.process.with.a.temperature.gradient.of.more.than.10°F.
(12°C)..This.means.that.there.is.an.irregular.ield.of.temperature.and.thermal.
stresses.and.can.be.detected.by.NDT.methods.