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Compositematerials are composed of two or more kinds of materials with differentproperties. Through physical or chemical methods, these composite materialshave new properties. The comprehensive properties of composite materials arebetter than those of raw materials, so as to meet different requirements. Thehistory use of composite materials can be traced back to ancient times. Strawor wheat straw reinforced clay and reinforced concrete, which have been usedfor hundreds of years, are composed of two materials. In the mid-1960s, carbonfiber reinforced composites came into being, and they were used in aircraftstructures in the early1970s. Compared with the traditional materials , compositematerials have the characteristics of high specific strength and specificmodulus, good fatigue resistance, designability, and the identity of materialsand structures. The application of com posite materials in aircraft structurehas been improved continuously. The amount of composite materials used inAirbus A350 is close to 40% of the total mass. The composite materials used inthe wing and fuselage of Boeing 787 are more than50%.Only carbon fibercomposites used on fuselage panel for Airbus A380 is more than 30 tons.
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