L7 composites - Materials Science and Engineering

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30 Fibers for Polymer Matrix Composites Intro Composite Applns. Properties Voigt, Reuss, Hill Anistrpy. CTE Cellular Matls. Wood • Many types of fibers are available: carbon, glass, aramid, quartz, polyethylene, boron, silicon carbide, alumina, aluminosilicate. • The polymer matrix composite business is dominated by volume by carbon, glass <strong>and</strong> aramid fibers because they offer the best performance:price ratio. “Mechanics of Fibrous Composites”, C.T. Herakovich
31 Intro Composite Applns. Properties Voigt, Reuss, Hill Anistrpy. CTE Cellular Matls. Wood Carbon Fibers • Modulus ranges from 200-750 GPa (cf. Steel-210) • Strength ranges from 2-6 GPa • Breaking strain ranges from 0.2 - 2 % • Density ranges from 1.76- 2.15 • Highest cost compared to glass or aramid, but greatest range of properties. • Internal structure consists of radially-aligned graphite platelets, which leads to some anisotropy in properties in the fibers. Both thermal <strong>and</strong> electrical conductivity are generally good (but then insulation required where metals might be in contact for carbonfiber composite).
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L7 composites - Materials Science and Engineering

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