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Composite materials are commonly classified according to matrix and fiber constituent as follows:

1 1. The matrix classes includes:(a) Organic Matrix Composites (OMCs):• Polymer Matrix Composites (PMCs)• Carbon matrix composites (carbon-carbon composites)(b) Metal Matrix Composites (MMCs)(c) Ceramic Matrix Composites (CMCs)

2 2. The fibers can be distributed under three categories:(a) Fiber Reinforced Composites: these are composed of fibers (discontinuous or continuous) embedded in matrix material. The properties of a discontinuous fiber composite vary with the fiber length.(b) Laminar Composites (e.g. sandwich structures): these are composed of layers of materials held together by matrix.(c) Particulate Composites (e.g. concrete and wood particle boards): these are composed of particles (in flakes or powder form) distributed or embedded in a matrix body.