Chapter 1350

You know, China's take-off in three-dimensional weaving technology is not a breakthrough in a flash of insight, but has been continuously invested for 12 years.

In other words, when China Tengfei was still a small and weak Tengfei group, three-dimensional weaving technology had become the key core technology of Tengfei department at that time.

There is no other reason for this, just because when Tengfei group studied carbon fiber composites, it found a unique weaving method to change the arrangement order of carbon fiber wires, so as to make the carbon fiber composites have the effect of specular reflection, so as to reduce the radar reflectivity and achieve the so-called radar stealth effect.

This discovery can be said to be one of the most important achievements of Tengfei department in the field of scientific research at that time. Once it was discovered, it was classified as confidential by the headquarters and focused on research and development.

No way. This discovery is really too important, because once this technological achievement is applied, it will not only solve the problem of stealth materials for the next generation of combat aircraft and bombers, but also greatly reduce the problem of high maintenance cost in the later stage of stealth aircraft, and greatly improve the equipment conditions, attendance rate and appropriateness rate of stealth aircraft.

Not to mention the country with insufficient financial resources at that time, even if the United States, whose annual expenditure accounts for more than 40% of the world's total expenditure, knew that Tengfei had such technological achievements at that time, it would also rush to shout, I want, I want, I want

It is the so-called landlord family that has no surplus food. Although the United States is rich and powerful, the maintenance cost of stealth aircraft is too high for the U.S. military.

The reason for this is very simple. Most of the stealth aircraft developed by the U.S. military were pre researched in the 1970s. In the 1980s, they entered the substantive key projects. Although they are still world-renowned in technology and can be called the Nanbo Bay of the solar system, they are still old things in the 1970s and 1980s in concept.

Therefore, the stealth of the U.S. military relies more on the advanced starting shape + non-metallic materials with low radar reflectivity + thick absorbing coating to reduce the radar detection efficiency.

China's take-off directly surpasses these three kinds of urban planning, which can be called the three iron laws in the field of stealth aircraft design. Starting from the material itself, the material itself has extremely strong radar wave absorption and scattering functions.

It's like playing a shy two person game with the goddess. For physical reasons, the vain little white face naturally wants to do enough foreplay. What 9, what lick, toss and toss for more than an hour, and the result is less than two minutes.

It's not the same for a strong man. He's big, durable and alive. Naturally, he doesn't need any foreplay. He pushes it to the first 60 minutes. If he doesn't feel refreshing, he adds half an hour to make the goddess soar from the depths of her soul.

Compared with the American work, the path of China's take-off is more like a direct hard man. Since its own conditions are so good, it is regarded as the most precious by the Americans, and it has been listed in the confidential level from beginning to end. For the technical path of China's take-off, the stealth coating can only be regarded as a choice of adding flowers to the brocade, not a necessity to send charcoal in the snow.

Natural is good, can further reduce the radar reflection probability, if there is no problem, because the material itself has a very strong radar wave absorption and scattering function, can also achieve stealth effect.

Since the complex and expensive stealth coating has become dispensable, there is no need to care so much about the maintenance. If the condition is good, spraying can be done. If there is no such condition, applying a layer of ordinary coating can still press the third generation machine on the ground and rub it fiercely.

The problem is that the technological path of China's take-off is good, but it is very difficult to achieve. The reason is very simple, that is, the whole fiber weaving method is very complex, so that in the first five years, the then take-off group could only rely on simple equipment to manually complete the preparation of test samples.

The waste rate and material waste rate are frighteningly high, not to mention the time cost. It often takes more than three months to complete, but even so, only one test sample of the size of a TV remote control can be produced each time.

In this case, no matter how promising the carbon fiber special braided stealth path is, it will never be applied in practice. After all, stealth aircraft is an industrial product, not a work of art. Since it is an industrial product, it involves large-scale mass production. Even if China's take-off technology path can greatly improve the performance of stealth aircraft, it will be useless if it can not be industrialized mass production.

Therefore, it became the focus of Tengfei group in this field to find a way to mass produce this kind of special carbon fiber composite with stealth properties.

However, the problem is that even if we know what the problem we are facing, we have many difficulties in solving it. How to do it, how to do it, and what solution to use, not to mention the then Tengfei group, are estimated to be confused in the whole world.

At that time, when Tengfei group was at a loss for mass production of stealth materials, an article in the internal academic journal of NASA obtained through special channels attracted the attention of relevant team members of Tengfei group at that time.

Richard Mendelssohn, a Swedish American aeronautical materials scientist, works in NASA's Aeronautical Materials Laboratory and has participated in the research and development of Aeronautical Materials in many cutting-edge fields of NASA.

Mendelssohn's article is a kind of technical solution that he suddenly imagined in his spare time, that is, to use NASA's set of aerospace products, such as high-performance military reconnaissance satellites, advanced space telescopes, stealth aircraft and new strategic transport aircraft, to provide a three-dimensional braiding machine made of high-strength composite materials, Building a new array may be able to have a certain radar mirror reflection effect by changing the way of filament winding and internal linking.

Although Mendelssohn's article does not explain the specific feasibility, and in the notes of the article, it is only a guess, let alone the so-called follow-up.

After all, DuPont stands behind the camouflage coating of the U.S. Army. Its annual interests are not so big. If we really come up with a new thing that is dispensable for the camouflage coating, will you let DuPont drink from the north and West?

If you want a follow-up, you can't do without DuPont.

But no matter whether there is a follow-up or not, it is not feasible for the then Tengfei group to make a roll call. It is no different for the then Tengfei group to obtain a treasure, because Tengfei group, which has accumulated a lot in this field, knows very well that Mendelssohn's conjecture is not only correct, but also highly feasible.

What else does that say? Experts in the United States have named the direction, and then they roll up their arms to finish the work. As a result, more than ten years have passed through the first generation of dl-520 three-dimensional knitting machine; The second generation of dl-527 three-dimensional braiding machine was finally developed in China last year. The third generation of dl-535 three-dimensional braiding machine, which can braid carbon fiber composites with stealth properties, has been the world leader in this field ever since!