ME 350 – Lecture 12 – Chapter 11. COMPOSITE MATERIALS Advantages & Disadvantages Components in Composite materials Composite Examples Fiber orientation Secondary phase examples Interface & Interphase Composite Strength. Composite Advantages.
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Most composite materials consist of two phases:
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Carbide with 85% WC and 15% Co
Elastic modulus and density can be estimated by the rule of mixtures (Eq 9.5 & 9.6):
Ec= fm·Em+ fr·Erdensity: ρ = fm·ρm + fr·ρr
Ec′ = Em·Er /( fm·Er+ fr·Em) f – volume fraction
Variation in elastic modulus and tensile strength as a function of direction relative to the longitudinal axis of the carbon fiber.
Foam or honeycomb achieve highest ratios of strength‑to‑weight