section%2010.4%20-%20Composites - 10.4 Composites...

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10.4 Composites Objectives List types of composites. Calculate composite properties. It is very rare for a pure material to be used in an engineering application. In practice, there is no single material that has all the properties we might need, and so we use combinations of materials that combine the desired properties of the different materials. The most common type of combination is a composite . A composite is simply a combination of two or more different materials. It is different from a mixture in that mixtures obey the rules for phase diagrams and kinetics that we saw in Chapters 6 an 8. Instead, composites are usually just physical mixtures in which each component might have dimensions of a few microns to millimeters. You may also have heard of nanocomposites. These are composites in which there is at least one component that has dimensions of nanometers. Nanocomposites are interesting because they have unusual properties that often disobey the rules of conventional composites. We usually distinguish between two components of a composite, the reinforcement and the matrix . The reinforcement is generally a fiber or a particle, which is embedded in the matrix. Usually the reinforcement adds strength or stiffness to the matrix, while the matrix acts as the glue that holds the reinforcement together. There are many different kinds of composites. Some examples are: Fiber-reinforced polymer composites. This is what most people think of when they hear the word “composite”. They consist of some kind of fiber reinforcement embedded in a polymer matrix. They are often used in aerospace, marine, and sports applications. Composite bicycle frames are carbon fibers embedded in an epoxy matrix. Rubber. Most rubbers have some kind of reinforcement added to improve stiffness and durability.
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  • Spring '08
  • unknown
  • Composite material, high temperature aerospace Thermoplastic polymers Discontinuous fiber composites Metals Ceramics High, continuous fiber, continuous fiber composite

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section%2010.4%20-%20Composites - 10.4 Composites...

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