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Structural design of structural absorbing materials

Author:admin   AddTime:2021-10-04

Structural stealth materials have dual functions of bearing and stealth, and become the main technical means of stealth materials at present. According to the different structural forms of absorbing composite materials, structural absorbing materials can be divided into two categories: laminated absorbing composite materials and sandwich absorbing composite materials. Sandwich-type wave-absorbing composite panels not only require high strength, but also have good wave-transmitting properties; the sandwich core is mostly composed of honeycomb and corrugated structural materials filled with lossy media. For the matching design of the sandwich structure, it is usually matched by the concentration of the loss medium, or by designing the size of the honeycomb cell and the height of the honeycomb to achieve the effect of broadband absorption.



The influence of the size of the honeycomb material on the absorbing performance is studied, and a numerical calculation method is proposed to calculate the absorbing performance under different conditions such as the height, pore size, and absorbent dosage of the honeycomb within 8-18GHz. The foam sandwich material is similar to the solid material. Theoretically, the content of absorbent is higher than that of the honeycomb sandwich, and the foam sandwich material can form a multi-layer absorbing structure, which helps to broaden the absorption frequency band. In addition, laminate-type absorbing materials are mostly used in the main load-bearing structure of armor and aircraft. Laminate absorbing composite materials are usually composed of a wave-transmitting layer, a loss layer, and a reflective layer. Sometimes, in order to have better impedance matching, the laminated absorbing composite material is designed according to the principle of gradient absorbing. Ten layers of materials are used to obtain a wider absorbing frequency band and a better absorbing effect.

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