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Combination of two or more materials that when combined, results in better properties than those individual components used alone.The concept of mixing two materials to sum up mechanical properties is pretty old! here is a fun link about the history of composite materials
This two components are a reinforcement and a matrix. This process can get materials with greatly advantages compared with bulk monolithic materials. The main reason we infuse a resin into a fabric is because, independently, the fibers works great in tension but not at all in compression. And the resin works well (ish) in compression. When mixed, the resin distribute tensile loads into all layers of the lay up while the fibers, helps the resin to work great in compression.
The lower density of the material allows us to have a much greater relative structural efficiency. Also, as we can decide the fibers orientation, we will optimize its performance by desire. Its like if we could easily orient the grains of our metals. Composites in this way, plays with and advantage.
EXCEPT FOR GALVANIC CORROSION
2. Wet Lay up