Environmental Engineering Reference
In-Depth Information
5.7.3
Testing Mechanical and Thermal Properties
of the Prepreg Laminates
We. tested. the. key. mechanical. properties. of. the. laminated. plates. (25. ×. 2.4.
mm). of. the. different. lengths. including. tensile. and. compression. strength.
(modulus). at. 0,. ±45°,. and. 90°. conigurations;. shear. strength/modulus,. and.
interlaminar.shear.strength,.as.described.by.Y..Golfman.
17
.Thermal.proper-
ties.of.interest,.coeficient.of.thermal.expansion.(CTE),.and.thermal.conduc-
tivity,.were.examined..The.combined.test.panel.was.based.on.the.following.
ASTM.(American.Society.for.Testing.and.Materials).standards:
•. ASTM.D638.(ref..D3039/D3039M).Test.Method.for.Tensile.Properties.
of.Polymer.Matrix.Composite.Materials
•. ASTM.D696.(ref..D3410).Test.Method.for.Compression.Properties.of.
Polymer.Matrix.Composite.Materials
•. ASTM.D732.Shear.Strength.of.Plastics.by.Punch.Tool
•. ASTM.D903.Peel.or.Stripping.Strength.of.Adhesive.Bonds
•. ASTM.D696.Coeficient.of.Linear.Thermal.Expansion.of.Plastics
We. also. examined. the. microscopy. of. the. laminate. surface. after. thermal.
cycling.for.presence.of.microcracking.
Mechanical.properties.of.prepreg.laminates,.consisting.of.traditional.car-
bon.ibers.and.epoxy.matrix,.can.be.modiied.using.carbon.nanotubes..Basic.
mechanical.properties.of.unidirectional.laminates.(stiffness,.strength,.frac-
ture. toughness,. etc.). are. summarized.. Next,. quasi-isotropic. laminates. are.
subjected. to. tension,. compression,. lexural,. and. compression. after. impact.
(CAI).tests.
Figure 5.3.demonstrates.the.tensile.test.setup.with.measurement.of.longi-
tudinal. and. transverse. strains. by. video-extensometry.. And,. advanced. ix-
ture.for.combined.compression.load.transfer.is.represented.in.Figure 5.4..
5.7.4
Conclusions
.
1.. The. increasing. demands. for. design. toward. stiffness. and. fatigue.
strength.have.required.development.of.more.accurate.and.reliable.
testing.techniques.
.
2.. Improvement.of.stiffness.and.strength.and.with.no.adverse.effects.
on. mechanical. properties. due. to. carbon. nanotubes. dispersion. are.
experimentally.veriied.
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