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Since the Wright brothers successfully flew a powered aircraft for the first time in Kitty Hawk, North Carolina, USA, ushering in a new era of human conquest of the sky, the most active military operations with aircraft as the main weapon soon appeared.

——Military Aviation, other book friends are reading: Armor Full Reading. The emergence of military aircraft has truly entered the three-dimensional era of war at the beginning of this century. The intervention of military aircraft has greatly enriched the means of warfare and strengthened the

It increased the intensity and depth of the war. At the same time, the war stimulated and promoted the progress and development of military aircraft.

In 1794, military manned balloons entered the arms of the god of war before airplanes. In that year, France established the world's earliest military balloon unit - the "Balloon Detachment". For about fifty years thereafter, balloons were mainly used for enemy reconnaissance.

In 1849, Austrian artillery lieutenant Franz Uchartes first thought of using balloon bombs to attack the enemy's city of Venice, which became the earliest bombing operation in history. The airship is another flying tool invented by humans after the balloon.

The difference from balloons is that they can be driven by power for controlled flight. Soon, they were also used in military operations and had a certain impact on combat operations.

After the invention of the aircraft, only seven years later, it was carefully used in combat. It was Captain Piazza, commander of the Italian Army Aviation Battalion, who flew the aircraft to conduct an attack on the Turkish army positions between Tripoli and Azizia.

An hour of aerial reconnaissance, read the full version of the novel: Confused Jianghu. This operation was recorded in the history of aviation because it was the first time an aircraft participated in the war. It took place on October 23, 1911. On November 1 of the same year. Italy

Lieutenant Giulio Giotti, a military pilot, dropped 4 bombs each weighing 2 kilograms from the air onto Turkish army targets on the ground. This was the first time for aircraft bombing. The several incidents in the Italian-Turkish War were very small in scale and were only symbolic.

Although the aviation combat behavior is only the embryo of military aviation, it has attracted the attention and imitation of various countries.

In early 1912, when French pilots went out to perform reconnaissance and communication missions, they were required to carry machine guns for self-defense, but there was never an air battle. According to statistics, as of 1910, the five major militaries of Germany, Austria-Hungary, the United Kingdom, France and Russia

Powerful countries only have 50 military aircraft.

In August 1914, after the outbreak of World War I, aircraft were really widely used in combat. But at the beginning, almost all military aircraft were reconnaissance aircraft, and people did not know enough about the use of aircraft in air combat and air raids. However,

Soon, people came to appreciate the magical effects and powerful power of air combat. During the "Jiao'ao Incident", the Jiangsu Army Air Force, which suddenly emerged as a new force, almost wiped out the main force of the powerful Japanese navy at the cost of zero losses, which surprised the world.

Among them, it unveiled a revolution in the history of human warfare. The form of warfare shifted from land, sea, and sky, and developed into three-dimensional operations on land, sea, and air.

Since then, in view of the decisive combat results and revolutionary pioneering achievements of China's aviation power in the war, various countries have invested heavily in the development of their own aviation technology. Military aircraft with various purposes have appeared one after another, and various aviation combat modes have continued to evolve.

Emerged, military aircraft have become indispensable and important weapons and equipment in war. It is also from this beginning that aviation manufacturing has rapidly developed from an "adventurer's industry" to a scientific and technological field that gathers a large number of professionals...

As the highest science and technology school in China, Dehua University has been more than just a university from the first day of its establishment. More often, it is also a research institute. With the support of companies and schools,

.Students and teachers here work together to conduct various research and establish a research-oriented university. This is exactly what Li Zicheng and the company expected when they established this university.

The School of Aeronautical Engineering of Dehua University is perhaps the highest aeronautical engineering science system established in a university in the world. Here, from aeronautical power, aeronautical materials, aeronautical engineering, aerodynamics and other aspects related to aeronautical technology, the magic path is

Yiquanfang Reading has professional teachers who provide systematic training. After students master all this knowledge, they can quickly grow into a qualified aerospace engineer...

"...Materials, as we all know, the reason why the aircraft invented by the Wright brothers can fly into the sky has a lot to do with the materials they choose, such as the aluminum cylinders they used to reduce the weight of the engine..."

When the German engineering materials professor was explaining materials in class, Chen Fanghan was still thinking about the experiment he was conducting - large laminates.

Large laminates are materials used in manufacturing aircraft. Originally, all types of aircraft manufactured by China Aircraft Manufacturing Company were made of aluminum alloy materials with Duralumin as the skin. This light metal material brought the success of a series of aircraft

, However, correspondingly, according to the export principles formulated by the Army Department, the Army Department has direct veto power over aircraft exports.

After the "Jiao'ao Incident", all countries showed a strong interest in the Chinese attack aircraft that made a splash during the incident, and tried to purchase the aircraft at high prices. Faced with the procurement proposals from various countries, the company also used the aircraft for national defense.

They refused to sell it for confidentiality reasons, and at the same time began to develop a "shrunk version" of the aircraft. However, when the "shrunk version" of the aircraft completed testing and the manufacturing company was preparing to take advantage of the war to make a fortune from abroad, the Ministry of War took the initiative to

The company is prohibited from exporting aircraft on the grounds of national security. The reason is very simple - metal aircraft can easily leak corresponding national defense secrets.

After the export of the shrunken version of the aircraft suffered a setback, the China Aircraft Manufacturing Company fell into a dilemma - aircraft production was limited by the order quantity. "The French manufacture 500 aircraft per month, and the Germans manufacture 400 per month...

...And we only manufacture less than a thousand aircraft a year!" Jiangsu Army's procurement is extremely limited, and even the "shrunken version" purchased by the Central Army is also extremely limited. If the company wants to develop, it must rely on international

Market, taking advantage of the name brand effect created by the "Jiao'ao Incident", exported large quantities of fighter jets and bombers to various countries.

The metal fuselage is the biggest feature of Chinese aircraft. At this time, aircraft in various countries only use wooden beams and cloth skins. These lightweight materials may be able to meet the needs of low-speed aircraft, but for high-speed aircraft

Words are not enough. On the other hand, although Chinese aircraft use aluminum alloy to manufacture aircraft, China's aluminum alloy production is extremely limited. With an annual output of more than a thousand tons of aluminum alloy, aircraft manufacturing companies have to rely on American companies.

Imported aluminum alloy, return to Wolfenstein to read in full.

Export restrictions and raw material supply issues forced the company's engineers to turn their attention to other materials. Apart from aluminum alloy, what other materials are there? Cloth, obviously not, almost naturally thought of wood and wood laminates.

.The company then invested a lot of talent and financial resources to first study and solve a series of problems such as the production process of large laminates and testing the mechanics and related properties of the laminates after they were made.

The so-called "big block" refers to a layer point with a width and a length of more than one meter each, because only laminates of this size are suitable for aircraft manufacturing and future repairs. The length problem is easy to solve, but the width problem

It involves the size of the cutting tools and equipment, which requires a giant wood planer and a giant wave press, and the general metal cutting machine tool cannot be converted into a giant wood planer. Fortunately, at this time, the laminate

The production technology has long been developed and matured in Lianyungang, and the remaining problem is to choose the appropriate wood.

Finally, after a series of experiments, the manufacturing company chose birch to make aviation laminates. The birch was cut into thin wood slices of appropriate thickness, and the thin wood slices were pressed into three, five, or multiple layers using appropriate pressure and glue.

Taken together, the wood corrugation direction of each thin slice forms a 90-degree angle with the wood grain direction of the adjacent layer, so that the strength and shrinkage rate in the longitudinal and transverse directions are close to each other, thereby meeting the needs of mechanical properties.…

.

Even after choosing birch, the company established a research institute and sent people to various provinces in the country to collect samples, purchase different types of wood, and conduct tests on mechanical and related properties. In the past year, Chen Fanghan's research institute collected materials

More than 300 kinds of materials have been tested. Various strength and physical tests have been conducted as many as 290,000 times. The "Handling and Use of Aircraft Wood" and "Draft Standard for Wood Mechanical Testing" have become the company's standard cases.

It has also become a textbook on aeronautical engineering science. Even now, research on the mechanical properties of various woods is still being carried out to obtain the most reliable data to adapt to aircraft design and manufacturing.

While these tests are being carried out, the manufacturing and use of laminates are constantly improving. A variety of materials and different aerospace aspects are used on an aircraft to meet the performance and at the same time reduce the weight of the aircraft. Early on

A few weeks ago, the manufacturing of all-wood aircraft has been successful, and the company has begun to study aluminum and wood hybrid aircraft to save the use of aluminum alloys. Good-looking novel: The Bronze Throne txt download.

At this time, there was only one reason why Chen Fanghan was distracted in class. The experiment he applied for was now in progress. As a sophomore student, he had only been an assistant at the Aviation Research Institute for a few months.

, the reason why he was able to successfully apply for a subject is because the subject he applied for pioneered another material-bamboo.

Thinking of his own experiment, Chen Fanghan couldn't help but recall the excitement he felt when he made the unexpected discovery after lunch two months ago, spent half a day testing it, and proposed the experimental plan to the hospital.

"...the strength and material strength of bamboo, the tensile strength of the knotless part near the skin, that is, the green part of the bamboo, is equal to that of Duralumin used to make aircraft, and its specific gravity is only one-third of that of aluminum alloy.

Its strength is also better than that of wood, and it is more suitable for manufacturing aircraft than wood."

It was after that suggestion that he got a laboratory, even several assistants - his classmates, and a relatively generous experimental fund of two thousand yuan to conduct his research, thus

Determine whether bamboo is suitable for use in aerospace manufacturing.

"How about it?"

After class, Sun Qiming, the German professor who had just changed his Chinese name, looked at his students. He had noticed that his students were distracted in class before. He could understand Chen Fanghan's distraction. Maybe

, because his experiments, for materials engineering, what he learned in experiments far exceeded what he learned in textbooks.

"I'm very sorry, Professor Sun, I..."

Chen Fanghan looked at the professor apologetically and apologized quickly.

"Nothing, I mean how did your experiment go?"

“Very smooth!”

As soon as the experiment was mentioned, Chen Fanghan, who is good at talking, suddenly started talking more.

"Now, we are conducting experiments on Nanzhu, which is also a kind of bamboo. It is very common in the southwest region. It has many sources, large output, and extremely abundant supply. The height of the Nanzhu we selected is within five

Tens of thousands of qualified specimens were made from 65 Phoebe bamboo strains with diameters ranging from 6 cm to 12 cm. They were tested for specific gravity, shrinkage, tensile strength, compression resistance, bending resistance, shear resistance and other strength tests, as well as different strength tests.

Tests on the relationship between moisture content and strength, and just one test on the relationship between long-term strength and location, have been conducted more than 2,000 times..."

Although in front of the professor, Chen Fanghan still did not tell the test results. The test results obtained now are far more successful than he originally imagined. The ratio of tensile strength to specific gravity at a distance of about 8% of the thickness of the bamboo surface is three

It is twice the amount of Duralumin used by the company. After this result was reported to the company, his experimental group was quickly enriched. It also received more investment. In the company's view, they may have a product that can fully replace

It is a "new material" of aluminum alloy, and more importantly, this material is all sourced from domestic sources, and the source is not restricted. This is the most basic prerequisite for the development of military industry...

Then the two of them walked while talking to each other about material engineering technology issues. To be precise, they were asking each other for advice. As a student, Chen Fanghan was very good at natural materials. Sun Qiming, a German, was more focused on metal materials. This kind of mutual exchange might be able to

Everyone takes advantage of their strengths.

"...Natural materials are ultimately limited by the most basic properties of natural materials, and their improvement is extremely limited. In the short term, natural materials may be able to become excellent aviation materials, but in terms of future development, aluminum alloy

The development is more promising..."

Chen Fanghan has a very clear view of the future of aviation materials.

"Just like steel. The hardness of steel was limited at the beginning, but after years of development, adding various alloys, and using various technical processing processes, the strength of steel is constantly increasing, and the same is true for aluminum alloys. Therefore, after completing this test

After that, I will still concentrate on the research of aluminum materials,..."

As the two were walking and talking, a student walked past them when they were walking out of the Aviation College. He looked at him twice and then walked towards the Chemistry College. For Dehua University, which implements a small college system

Generally speaking, a small college is almost an independent small university. Even in China, the faculty of these small colleges are stronger than many universities. The scale of the School of Chemical Engineering benefits from the development of the chemical industry, and its scale ranks first in Dehua.

Enter the top ten.

"I just have one question, what materials can resist chemical corrosion? Other book friends are reading: Big collectors!"

Almost as soon as he met his old classmate, Shi Gangqiang asked Feng Shouli, who took the exam for two years before he was admitted to Dehua University. The reason why he took the bus back to his alma mater from the dock was to solve the problem of chemical corrosion in the cabin.

, and on this issue, he naturally thought of his old classmates.

"ah……"

Adjusting his glasses, Shi Gangqiang looked at his old classmate counting his fingers.

"Well, there are many materials, but not every material can resist all chemical corrosion. Strong, why do you think of asking this question..."

"Boat!"

After spitting out a word, Shi Gangqiang looked at the laboratory filled with various test equipment.

"Ship liquid chemicals..."
To be continued...