Carbon fiber is a kind of inorganic high-performance fiber which is transformed from organic fiber through a series of heat treatment and contains more than 90% carbon. It is a new material with excellent mechanical properties. It has the inherent characteristics of carbon material and the softness of textile fiber. Processable, it is a new generation of reinforcing fibers. In recent years, carbon fiber composite materials have also made great strides in the automotive field, and they are widely used. In terms of lightweight materials, high-strength steel, magnesium, aluminum and plastic are still the main automotive material combinations, especially carbon fiber, and its superiority can almost completely replace steel materials. Among them, the composite material based on resin and metal is mature in the body, and has many advantages for the manufacture of the body.
(1) Has a high strength. The carbon fiber composite material has the highest specific modulus and specific strength among the currently used materials, and when used to make a member having the same strength and rigidity as the high-strength steel, the weight can be reduced by about 70%.
(2) Has good fatigue resistance. Carbon fiber composites have excellent fatigue resistance. Since the fracture under the fatigue load is the result of crack propagation inside the material, the interface between the carbon fiber and the matrix in the carbon fiber composite can effectively prevent the fatigue crack propagation, and the applied load is borne by the reinforcing fiber, so the fatigue strength limit is better than the metal material and other Non-metallic materials are much higher.
(3) Collision energy absorption is good. Carbon fiber composite material is the most ideal substitute material for automotive metal materials. The energy absorption rate in collision is 4 to 5 times that of aluminum and steel. It can reduce the quality of the body while ensuring no loss of strength or rigidity and maintain anti-collision performance. The risk of reduced vehicle safety factor due to lightweighting is greatly reduced.
(4) Good manufacturing process. The carbon fiber composite material has good processability and designability. By adjusting the shape, arrangement and content of the CFRP material, it can meet the performance requirements of the strength and rigidity of the component. The components that can be manufactured by the mold can be molded at one time, reducing the fasteners and The number of joints can greatly improve material utilization.
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