Abstract
Much interest has been shown over the past few years in carbon fibers, a novel reinforcing material included in the growing field of structural composites. Typical carbon fiber products can easily match the physical properties of steel but with only one-fifth the weight. These unusual properties are attributed to the microstructure of the fibers and the orientation of extremely long graphitic crystallites more or less parallel to the long axis of the fiber. Variations in fiber strengths have been attributed to, among other things, voids between these crystallites.

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