Environmental Engineering Reference
In-Depth Information
E.Glass.600.g/m 2 .8HS.35%
8020.RP.206.E.Glass.280.g/m 2 .PW.WR.35%/1.00.m.0.48.mm
E.Glass.280.g/m 2 .PW.WR.35%
All. materials. are. supplied. on. a. roll. length. of. 20l. m. and. supplied. with. a.
light.tack.for.use.on.vertical.surfaces.with.the.exception.of.RP202.and.RP205,.
which.are.supplied.tack-free..The.standard.resin.system.is.pigmented.black..
8020.RAPI. 17
3.5
ReinforcedMaterial:CarbonFiberandGlassFiberFabrics
Hexcel.has.developed.a.patented.process.to.manufacture.continuous.rolls.of.
carbon.iber.fabric.in.which.the.warp.and.weft.yarns.are.oriented.on.the.bias.
at. +/-. 45. degrees.. These. HexForce ® . bias. weave. fabrics. provide. many. cost-.
and. weight-saving. advantages. to. customers,. notably. by. reducing. prepreg.
waste.and.labor.operations. 16
.HexForce.bias.weave.fabrics.are.ideal.for.high.aspect.ratio.parts.that.need.
bias. reinforcement,. such. as. aircraft. ribs,. stringers,. spars,. and. helicopter.
blades.. They. also. are. used. in. engine. nacelles,. aircraft. barrel. sections,. and.
secondary. structures.. The. fabrics. are. suitable. for. prepreg. and. processing.
and.available.with.HS.and.IM.carbon.ibers.
3.5.1 
Carbon Fibers
The.parameters.of.a.plain.weave.carbon.iber.include:.5.7.oz./sq..yd.,.50.in..
wide,. .012. in.. thick,. 12.5×12.5. plain. weave.. This. plain. weave. carbon. iber.
is. the. most. commonly. used. type. for. lightweight. aerodynamic. parts.. Only.
three.layers.are.typically.necessary.to.produce.nonstructural.pieces..It.wets.
out. quickly. and. handles. easily.. Typical. full. roll. length. is. 100. yards.. A. 3K,.
plain.weave.carbon.iber.fabric.is.shown.in.Figure 3.3. 19
Mechanical.properties.of.the.IM7.carbon.iber.impregnated.by.epoxy.resin.
are.listed.in.Table 3.8. 12
Table 3.9.lists.the.modulus.of.elasticity.and.coeficient.of.thermal.expan-
sion.for.the.prepreg.laminates.based.on.the.IM7.carbon.ibers.
The.modulus.of.elasticity.and.coeficient.of.thermal.expansion.for.the.pre-
preg.laminates.based.on.the.K63712.carbon.ibers.are.shown.in.Table 3.10.
3.5.2 
Twill Weave Kevlar ®
Twill. weave. Kevlar. is. preimpregnated. with. an. epoxy. resin. system.. This.
material.can.be.stored,.shipped,.and.handled.at.room.temperatures.and.is.
 
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