The Military-industrial Scientific Research System of the Academic Master Chapter 828

Chapter 828: It's just equipment, buy it!

Geological exploration is by no means an easy and pleasant task, even when precise coordinates have been obtained.

Fortunately, today's technical equipment, especially vehicles and helicopters, are relatively complete, and safety is relatively guaranteed.

But if you really want to dig deeper into a point, it will still take anywhere from a few months to a few years.

Therefore, after deploying some key points of exploration work, Chang Haonan and Meng Zhenyuan returned to Beijing Hang University.

For them, all they can do now is wait.

Fortunately, Chang Haonan has no shortage of projects at hand.

In the next half month, in addition to paying daily attention to the progress of Ricci flow surgery, he also guided Li Yabo in his graduation project.

Actually, Chang Haonan didn't know what the so-called “1-meter all-composite shell” specifically meant until the completion of the project before the Spring Festival.

Haofei wants to develop a new engine nacelle for the C808 passenger aircraft, which is about to be put into mass production.

It is the thing that fixes the engine to the fuselage.

The diameter is about 1.3 meters.

If successful, it can probably reduce the weight of the aircraft by about 300kg.

It can only be said that technically the future is indeed promising.

But there is nothing operable for the time being.

At present, almost all high-grade composite materials used in China rely on imports, and the cost is very high.

The weight saved by replacing titanium-aluminum alloy with carbon fiber, even if it is extended to the full life cycle, is not worth the extra cost in the manufacturing process.

Of course, it doesn't hurt to do some research in advance.

After all, there will be many places where similar designs will be needed in the future.

In the long run, carbon-based composites will be used in parts such as the casings of launch vehicles and ballistic missiles, the bodies of large aircraft, and even the fan blades and casings of turbofan engines where the working environment is not particularly harsh and the probability of damage is relatively low. It is a major trend for materials to replace traditional alloys.

Quan should be regarded as a technical reserve.

Of course, for an undergraduate doing graduate work, these are still relatively far away.

So what Chang Haonan asked Li Yabo was to design a theoretically feasible overall plan.

The main purpose is to exercise the latter's ability to use existing tools to solve problems.

Otherwise, it would be really embarrassing if the students of the creator of TORCMultiphysics cannot play the software developed by their teacher.

However, sometimes life is like this.

When you don't expect something, it can often give an unexpected result.

One day at the end of March, just as Chang Haonan was replying to Professor Perelman's email asking about the progress, Li Yabo suddenly poked his head into the office:

“Teacher, please take a look, my simulation results seem a bit strange...”

These days, students with laptops are naturally very rare, so Chang Haonan could only follow Li Yabo to the student office to check on the situation.

It is said to be a student office, but now there are fewer students than teachers in the Torch Laboratory, so it is actually equivalent to Li Yabo having it all to himself.

So, the young man simply moved his luggage from the dormitory and started his life as 007 Liver Emperor.

After entering the door, Chang Haonan carefully bypassed a folding bed and came to Li Yabo's workstation.

On the computer screen, a finite element model that is thick in the middle and thin at the ends, slightly cigar-shaped, is displayed.

It was the overall plan of the engine nacelle that he designed.

Chang Haonan came closer to the screen and quickly read the results of the finite element calculation—

In 1999, last year, a hardware engineer named Huang Renxun officially coined the term "GPU".

In fact, the processor that assists the CPU in graphics processing took shape as early as the 1980s.

But the GeForce256 launched by NVIDIA has brought an epoch-making feature.

Real-time programmable shading technology.

TORCHMultiphysics will soon launch a free (not free shipping and storage carrier materials) and optional feature update.

When the user's computer is equipped with an independent GPU, the results of finite element calculations can be directly superimposed on the surface of the 3D model in the form of graphic rendering.

Instead of being able to output only a dry table like in the past.

Though in terms of results, there is no difference between the two.

But for the human eye, the former method is obviously much more intuitive.

Therefore, Chang Haonan can almost see at a glance that the design on Li Yabo's computer basically meets the project requirements proposed by Haofei.

“The result looks okay...”

He stood up straight again:

“Do you think something is strange?”

At this time, Chang Haonan glanced at the annotation in the lower right corner of the screen out of the corner of his eye.

The nature of the material he chose is written there.

Young's modulus 700Gpa…

The corners of his mouth twitched fiercely.

There is no need to look at other parameters.

Definitely T700 carbon fiber.

It can only be said that if you are not a householder, you don't know how expensive firewood and rice are. T700 has only been put into commercial use in the past two years, and because the production capacity cannot be increased, the unit price is quite high.

If you use this kind of thing extensively on a small 50-ton regional aircraft, you may be beaten to death by the user...

Fortunately, it is still in the design stage. Anyway, judging from the standards of practice, the problem is not big.

“Here it is.”

Li Yabo continued to enlarge and enlarge the 3D model as he spoke.

Finally, Chang Haonan discovered that the carbon fiber structure on the screen was not just a shell modeled.

It is composed of many thin layers.

“Have you studied the impact of composite laminate structures on performance?”

Chang Haonan was a little surprised.

“Yes, I feel that if we only provide an overall design plan, then Party A should be able to do it by itself, and there is no need to find our research team to solve the problem at all.”

Li Yabo's first sentence made Chang Haonan very satisfied.

Although I dislike the Haofei Group a bit.

“After I tried several different lay-up plans, I found that the orthogonal lay-up is significantly better in terms of ability to withstand shear loads and lateral loads, but this result is different from what I saw when I was on a business trip with Haofei Group. It's not the same…”

“Also, even if they are orthogonally stacked, the results of my two calculations will be different..."

In a daze, Chang Haonan seemed to see himself from a few years ago in the other person.

Subjective initiative is full.

Of course, I am a true undergraduate after all, so there is definitely still a huge gap in ability from what I was back then.

However, this is not the most important thing.

“That's not surprising.”

He listened quietly to what the other person said, and then replied:

"The anisotropy of this type of carbon fiber-reinforced composite material is very complex, the interlayer strength is unstable, and the thermodynamic and mechanical properties of the fiber and matrix are very different. We, or not only us, are very concerned about this material all over the world. The nature of it is still not fully understood.”

“So, although the current TORCMultiphysics can use your method to model the structure of multi-layer composite materials, it is unable to perform accurate numerical simulations in this case.”

"This is why I told you before, as long as we can design a theoretically feasible overall plan."

Hearing Chang Haonan's explanation, Li Yabo showed a slightly embarrassed look on his face:

“This…it turns out to be like this…”

He said and scratched his head:

“Then aren't these all useless efforts...”

Originally, Li Yabo wanted to secretly do the whole job and shock the teacher for a whole year.

As a result, I didn't finish my work in the end, and I had to go to the teacher to help find the reason.

“That can't be said.”

Chang Haonan could roughly guess what the other party was thinking, and shook his head with a smile:

“After all, you have done the entire modeling and calculation process yourself. It will be a rare experience for your future research work.”

“Some experiences can only be summed up through failure.”

Li Yabo nodded somewhat disappointedly.

But Chang Haonan's next sentence made his eyes light up:

"However, if you are really interested in the microstructure of composite materials, then I can directly purchase a batch of related equipment and materials for you and study it experimentally."

“Really…really?”

Li Yabo could hardly believe his ears:

“I asked before when I went to Haojing on a business trip, the equipment and materials are very expensive...”

Obviously, he had already secretly understood the situation.

Before Li Yabo could finish speaking, Chang Haonan waved his hand:

“The equipment used for laboratory research is different from their industrial production. The cost is not that exaggerated. You, teacher, and I can still afford it.”

“You just have to think clearly. Strictly speaking, this is materials science, not the field of structural mechanics. Experimental research is far more difficult and troublesome than numerical calculations..."

“I've thought it through.”

Li Yabo replied firmly.

"Well."

Seeing his student's persistence, Chang Haonan could no longer discourage him:

“With your current design, it's no problem for you to graduate from a bachelor's degree.”

He said and pointed to the model on the computer screen:

“So, from now on, I will officially treat you as a graduate student.”

Hearing this, Li Yabo couldn't help but sit up straight.

Although he didn't express his position, this action said everything.

Chang Haonan nodded slightly when he saw this, and then said in a solemn tone:

“I will give you one month to write a proposal report on the research on the microstructure of composite materials and attach the experimental equipment and materials you need.”

“If there is nothing wrong with the report, I will prepare it for you as soon as possible. Do you understand?”

(End of this chapter)

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