Click "new materials workshop", pay attention to the new trend of new materials carbon fiber composite material is a kind of composite material with resin as the matrix and carbon fiber as the reinforcement material; carbon fiber composite material has the characteristics of light weight and high strength, the specific strength is 6 times that of aluminum alloy and 5 times that of titanium alloy; the specific rigidity is 3.6 times that of aluminum and titanium, the greater the specific strength and specific rigidity means the same strength or rigidity If necessary, the required material quality is less, that is, the structure weight is smaller. In addition, the carbon fiber composite has excellent properties such as fatigue resistance and corrosion resistance.
The carbon fiber composite industry chain includes upstream carbon fiber production, midstream fiber fabric and carbon fiber prepreg, midstream and downstream carbon fiber composite structural parts and downstream application end products. The combination of carbon fiber and resin can be made into prepreg in the middle part of the process, or it can be made in the middle and lower part of the process. The combination of the production process of structural parts mainly depends on the selected manufacturing process.
Carbon fiber composite industry chain
In the forming process of composite structure, there are complex physical and chemical changes between component materials, which have great dependence on raw materials, composite material design, process methods, process parameters and process. At the same time, it is difficult to control process parameters accurately to ensure the consistency of production process.
Manufacturing cost accounts for a large proportion of composite material cost, which is one of the key factors affecting composite material economy. But at the same time, the manufacturing sector also has high barriers: on the one hand, the fixed asset investment of manufacturing equipment is large, which requires a strong financial strength; on the other hand, the selection of many manufacturing parameters and the control of intermediate variables are difficult to quantify and standardize, which requires relying on experienced production personnel. Consistency has always been one of the difficulties in the production of composite materials.
Both the maneuverability and endurance of military aircraft and the economy of civil aircraft are highly sensitive to weight. Weight reduction is the eternal pursuit of aircraft design and structural material selection under the condition of meeting the strength. With the development of materials and technological progress, the structural materials of aircraft are also constantly changing. Under the requirements of strength, metal materials replace wood. Under the requirements of weight reduction, light metals such as aluminum alloy and titanium alloy are widely used. At present, composite materials, especially carbon fiber composite materials, are rapidly growing.
The amount of composite materials used in military aircraft in China has increased rapidly. With the development of China's aviation industry, the proportion of carbon fiber composite in the application of various types of military aircraft is also increasing. It is the first time for China to use carbon fiber composite, J-11B, j-10b and j-10b in the fuselage of fighter aircraft, and the consumption of j-20, a new generation of stealth fighter, has reached about 10%.
The proportion of China's military aircraft composite structure has increased rapidly
The number of F-35s around China is increasing rapidly, and the pressure of military aircraft replacement is increasing. At present, the F-35 has entered an accelerated production period, with an annual output of more than 100 and cumulative delivery of more than 300. On the one hand, in order to ensure its air superiority in the Indian Ocean Pacific region, the U.S. is planning to replace the F-16 fighter of the U.S. military in South Korea with the f-35a stealth fighter from 2020, and the deployment of the F-35 in the U.S. Asia Pacific region is gradually increasing. On the other hand, the U.S. allies such as Japan, South Korea, Australia, etc It began to receive F-35 one after another, and the number of F-35 in surrounding countries grew rapidly.
Planned procurement quantity of F-35 in surrounding countries
In 2018, China's military aircraft has a large number of old models, and the need for upgrading is clear. In terms of total amount, the number of military aircraft in China is less than 1 / 4 of that in the United States; in terms of types of military aircraft, the number of American combat aircraft is 1.8 times of that in China, the number of special aircraft is 9.96 times of that in China, the number of fuel dispensers is 170.67 times of that in China, the number of transport aircraft is 5.15 times of that in China, the number of armed helicopters is 6.14 times of that in China, and the number of trainer aircraft is 8.07 times of that in China, with a significant gap; in terms of specific models, in terms of fighter aircraft, the second generation in China The proportion of aircraft types J-7 and J-8 is close to 50%, while the United States has eliminated the second generation aircraft, forming a modern fleet with three generations as the main and four generations as the auxiliary.
Proportion of various types of Chinese combat aircraft in 2018
Comparison of military aircraft structures between China and the United States
As one of the fastest growing countries in the world, China's air transport market is growing rapidly. In the 20 years 2018-2037, it is expected that the scale of the global airliner fleet will reach 47070, of which the scale of China's fleet will reach 9965, and the proportion of China in the global airliner fleet will increase from 16% now to 21%. In terms of new aircraft delivery, in the next two decades, China is expected to deliver 9008 airliners, worth about $1.3 trillion.
Number of civil aviation transport aircraft in China
At present, China's civil aircraft are mainly imported, Boeing and Airbus occupy most of the market share. However, with the accumulation of continuous R & D investment, China's domestic civil aircraft has gradually formed a system, showing a rapid development trend. In the field of civil aircraft, China now has ARJ-21 regional airliner, C919 trunk airliner and cr929 long-range wide body airliner. In addition, ARJ-21 has started mass production, C919 test flight has been promoted rapidly, cr929 has entered the preliminary design stage, and the development rhythm of the three civil aircraft is in a rapid echelon.
The development of domestic civil aircraft will bring great development opportunities to aviation composite materials. On the one hand, C919, cr929 and other models have larger weight and more composite materials. With the delivery of C919 in 2021, the demand for composite materials in the field of domestic civil aircraft will increase in multiple; on the other hand, the development of domestic civil aircraft will also bring historical opportunities for the industry chain localization, and the domestic composite materials will take this opportunity to enter the field of civil aviation and are expected to be further applied to foreign aircraft Type.
State of domestic civil aircraft
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