L7 composites - Materials Science and Engineering
L7 composites - Materials Science and Engineering
L7 composites - Materials Science and Engineering
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14<br />
Intro<br />
Composite<br />
Applns.<br />
Properties<br />
Voigt,<br />
Reuss,<br />
Hill<br />
Anistrpy.<br />
CTE<br />
Cellular<br />
Matls.<br />
Wood<br />
Examples of <strong>composites</strong><br />
• The classical example of a composite is concrete.<br />
• It is more complex than it appears. There are<br />
typically coarse <strong>and</strong> fine particles (rocks!) embedded<br />
in a matrix of silicates <strong>and</strong> sulfates. There is a high<br />
fraction of pores of all sizes. This is an example of a<br />
particulate composite.<br />
• Ordinary concrete (properly made) has excellent<br />
compressive strength but poor tensile strength. Thus<br />
reinforced concrete was invented to combine the<br />
tensile strength of steel with the compressive<br />
strength of concrete. This is an example of a<br />
multiscale particulate <strong>and</strong> fiber reinforced composite.<br />
It is particulate because the aggregate (coarse<br />
gravel) reinforces the cement, <strong>and</strong> fiber because the<br />
steel rods reinforce the concrete.
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