Decryption of the body materials of the most popul

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Decryption of the body materials of China's fourth generation fighter j-20

j-20 fourth generation heavy stealth fighter

j-20 fourth generation heavy stealth fighter is developed by AVIC Chengdu Aircraft Industry Group Co., Ltd., a domestic fourth generation heavy stealth multipurpose fighter. Before the release of the j-20, although it was basically recognized as a tailless delta wing canard layout, there were many versions of how China's fourth generation heavy fighter looked. Some people think that he will inherit the aerodynamic layout of the J-10 and adopt the abdominal inlet, that is, the so-called "J-10 development improved type"; The other is the conventional layout near the air on both sides. The current j-20 basically belongs to the latter. However, it is different from previous versions. Many of these features are unique around the world

under the current technology, the main methods of fighter radar stealth are body materials and coatings. According to the authoritative information available, China has made great achievements in the technology and application of military aviation composites. For example, the domestic j-11bs multi-path two seater heavy fighter bomber has a large number of new composite materials developed by China. Among them, nearly four fifths of the volume of the two tall vertical tails are made of composite materials, while the fully moving flat tail is made of composite materials. At the same time, composite materials and non-conductive materials are also widely used in the main wing, side strips, air inlets and tail wings, as well as leading-edge mobile flaps. Such a large proportion of composite materials are used in a fighter, which is extremely rare in the currently known domestic fighter. At the same time, it is sprayed with domestic new radar absorbing coating. This proves that China has made a breakthrough in the application of large-scale composite materials in fighter aircraft, which is a key technology in the development of the fourth generation fighter! Therefore, from the j-11bs, we can have a glimpse of some of the technologies of China's fourth generation aircraft

considering the pursuit of stealth by the fourth generation and the achievements of Chengfei on the j-10b, Lingyun speculates that the proportion of composite materials used in the j-20 fuselage is likely to reach%. Among them, epoxy resin matrix composites and carbon fibers are the main parts, while the other parts are mainly titanium alloys and traditional aluminum alloys. This is already a very large proportion. Composite materials are mainly used to make the body, which is commonly referred to as "skin", while metal materials are "skeleton". And from the current high-definition photos, the external surface of the j-20 is very smooth, without any unnecessary protrusions. There are two possibilities. First, the surface technology of the body is very good. The rivets and other parts are treated very well, and the coating of the microwave absorbing material is very thick, covering the rivets and other objects. However, Lingyun believes that the biggest possibility is that the j-20 uses the integrated integral molding and assembly technology of large-area composite outer skin! First, according to the shape of the skeleton, make a whole large-area mask with composite materials. First, short circuit the positive and negative poles of the electrolytic capacitor by 1 skin, and then cover and install the whole on the skeleton at one time. Its advantage is that it can reduce the surface joints as much as possible, and can greatly improve the stealth ability to meet the special needs of high-temperature characteristics. However, this technology is very difficult. At present, only a few countries in the world master it. However, at the previous Zhuhai Air Show, the "hidden arrow" and other resolutions required to restrict the use of materials that can cause cancer, are prone to organic mutation, toxic regeneration or have hormone interfering functions. UAVs have actually proved that China has mastered this technology. China's fourth generation fighter plan pursues stealth capability most. Therefore, it is almost certain that large-area composite materials will be used. Outer Mongolia hopes that the introduction of how to install the above concrete pressure testing machine and the operating procedures of the equipment can bring help to everyone

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