The definition given by the International Organization for Standardization is that composite materials are a kind of multiphase solid material composed of two or more substances with different physical and chemical properties. The various component materials can complement each other in terms of performance, so that the comprehensive performance of the composite material is better than the original component materials and meets various different requirements.

 

There are many types of composite materials, among which the most widely used are fiber-reinforced polymer composite materials (fiber composite materials, referred to as fiber composites). The basic composition of fiber composites is fiber and polymer matrix (commonly known as resin).

Fiber is the main factor that determines the mechanical properties of composite materials. It is used to bear the main load, limit the extension of microcracks, improve the rigidity and fatigue resistance and latent deformation performance of materials, etc. At present, the vast majority of fiber composites refer to thermosetting fiber composites. Thermosetting composite products are mainly used in sports equipment, construction, anti-corrosion, transportation, shipbuilding, aerospace and other industrial fields.

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