Carbon fiber composite materials on the stage of civil aircraft

Recently, the a350xw B ultra wide body airliner attracted much attention at the 11th Zhuhai Air Show The special spraying of its fuselage is the magnified carbon fiber structure, and A350 is a kind of airliner whose composite material consumption accounts for the largest proportion of the whole structure weight so far Typical carbon fiber resin matrix composite structure 1 what is carbon fiber composite? The so-called composite material, in short, is a new material system which is made up of two or more different materials through a special molding process in order to improve the performance of the material, or to make the material achieve special physical properties such as light, electricity and heat At present, in the world aerospace field, the most widely used composite material for manufacturing aircraft parts is carbon fiber resin matrix composite As the name implies, the material is composed of carbon fiber and resin matrix Carbon fiber is a kind of continuous filament material rising in recent decades Its diameter is 6-8 μ m, only one tenth of the hair diameter Generally, the hydrogen and oxygen elements in the fiber can be removed by complex carbonization process, so that it becomes a kind of near pure carbon material with more than 90% carbon content, thus greatly reducing the material quality In addition, the axial tensile strength of the carbonized material is also greatly improved, and the chemical properties are more stable The resin used in aircraft has good mechanical properties and heat resistance Its main function is to protect fiber and maintain dimensional stability Why is composite material selected for a helicopter tail 2 made of composite material? The biggest advantage of carbon fiber composite material is that it can realize the high integrity one-time forming of the shape manufacturing, which not only avoids the cutting waste of traditional metal materials in the process of processing, but also can make the overall cylindrical stiffened wall plate of the fuselage and the overall stiffened wall plate of the wing in a processing cycle, greatly reducing the use of rivets, bolts and other fasteners The density of carbon fiber composite is only 1.6g/cm 3, which is about 60% of aluminum alloy Therefore, if carbon fiber composite is used instead of aluminum alloy, it will reduce the weight by 20% ~ 25% This is very important for the aircraft, because the reduction of structure weight often leads to the improvement of maneuverability In addition to the above two points, carbon fiber composite has the advantages of long life, high reliability and good invisibility.