In Science of material materials receives the name of composed those that fulfill the siguentes properties:
These materials are born from the necessity to obtain materials that combine the properties of the ceramic ones, the plastics and the metals. For example in the industry of the transport they are necessary light, rigid, resistant materials to the impact and that resists the corrosion and the wearing down well, properties these that rarely occur meetings.
In spite of to have obtained material with exceptional properties, the practical applications are reduced by some factors that increase much their cost, like the difficulty of manufacture or the mutual incompatibility between materials.
The great majority of the compound materials is created artificially but some, like Wood and the bone, appear in the nature.
Types: Hardened by dispersion Formed by true particles
In terms of force, the fibers (responsible for the mechanical properties) serve to resist the traction, the matrix (responsible for the physical and chemical properties) to resist the deformations, and all the material presents serve to resist the compression, including any aggregate.
The cyclical blows or efforts can cause that the fibers separate of the matrix, which is called delaminación.
The laminar ones are formed by united panels to each other by some type of adhesive or another union. Most usual it is than each lamina is reinforced with fibers and has a preferred direction, more resistant of the efforts. This way we obtain a isotropic material, uniting several anisotropic layers markedly. It is the case, for example, of contrachapada wood, in which the directions of maximum resistance form right angles to each other.
panels sandwich consist of two outer laminae of high hardness and resistance, (normally reinforced plastics or Titanium ), separated by a less dense and less resistant material, ( polymeric frothy, synthetic rubbers, inorganic wood raft or cements). These materials are used frequently in construction, the aeronautics industry and the manufacture of electrical condensers multilayers.
Plásicos reinforced with fiber:
Thermoplastic reinforced by long fiber.
Composed of metallic matrix or MMCs:
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