Mechanical structures are becoming more and more complex. At the same time, complex materials are being used, such as composites. Among the several types of composites, fiber reinforced polymers are made of reinforcements fibers (mostly in glass or in carbon) that are kept together with a polymer resin (mostly epoxy). The polymer resin makes these composites very light while the reinforcement fibers provide them excellent stiffness and strength. Such composite materials, therefore, are highly attractive in applications where lightweight but very strong materials are required, such as in airplanes, wind turbine blades, race bikes, etc.
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