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Cost
considerations may suggest using different types of fiber in a composite. High
strength carbon fibers (high cost) are employed in regions of high tensile
stress, and lower cost glass fibers in regions with lower stress demand. Some
configurations that exploit this thinking are shown. A symmetric layup pattern
is used in the final material so that it will be isotropic in its in-plane
behavior.
In the lower diagram, two uni-directional glass cloths are
used between two carbon cloths in the left hand diagram. Each layer contains
only one fiber type. In the center diagram, the glass cloth layers have fibers
at an angle to the long axis.
In the right hand diagram, a glass fill
mat is used between two outer layers each with two fiber types. Carbon is
used longitudinally and glass in the transverse direction.
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