Material Empire

Xia Yangjie didn't know what he was crazy about, he had sat on the cold bench for four years, and he would still be so impulsive. Just now I heard a few comments from the teachers who just came back from the meeting in the teaching and research room. Xia Yangjie took his notebook and chased them out.

Xia Yangjie was graduated from a famous domestic university four years ago and was assigned to teach at Pudong Jiaotong University's Chemical Engineering Department. He didn't originally study polymer chemical engineering, but mathematics. The reason why he came to the Department of Chemical Engineering was ridiculous. That was because the female teacher who had taught mathematics in the Department of Chemical Engineering had children for two months and could not attend classes. The leader of the Department of Chemical Engineering asked a math teacher to come. Responding to her shortcomings, Xia Yangjie, who had just graduated, was assigned.

Xia Yangjie is not a nerd, but he lacks talent in teaching. In his view, jumping from one formula to another is simple, and there is no need to list detailed derivations at all. But when he lectured in this way of thinking, his students hung up on subjects.

The head of the department talked to him several times, and went to the classroom to listen to his lecture. In the end, he determined that this person was not a teaching material at all. Fortunately, the female teacher who gave birth at this time had returned from maternity leave, and Xia Yangjie was laid off with great regret and confusion.

Of course, the Department of Chemical Engineering can't support an idler in vain. After research, Xia Yangjie was transferred from the public course teaching and research room to the polymer teaching and research room, and assumed the research work on the fiber winding model.

Fiber winding is a composite material production technology that appeared in the 1940s. Simply put, the resin-impregnated fiber is wound around a core mold according to a regular pattern. After the resin is dried, the core mold is removed, and A fibrous resin product can be obtained.

The principle of fiber resin is a bit like reinforced concrete we usually see. Resin is equivalent to cement, and the fiber is equivalent to reinforcing steel, which can improve the strength of the material. The most common fiber resin is fiberglass, which is a plastic product reinforced with fiberglass.

In addition to glass fibers, fibers used in the fiber-wound products include aramid fibers and carbon fibers. Fiber winding technology can be used to make pipes, pressure vessels, solid rocket motor shells, etc. It is a new and emerging material technology.

As early as the end of the 1950s, China has begun research on fiber winding technology. At that time, it mainly served the needs of cutting-edge defense technology for two bombs and one star. In the 1970s and 1980s, China introduced several fiber winding equipment from West Germany, Italy, Japan, the United States and other countries, and has carried out localization related work.

The method of fiber winding is a bit like the process of winding a cotton yarn into a spindle in a cotton spinning factory. The wound core mold rotates at a certain speed, and the fiber moves back and forth along the axial direction, thereby forming a winding line. Xia Yangjie's task in the polymer teaching and research department is to help teachers doing research in this area to calculate the core mold running speed and fiber spinning nozzle speed to ensure that the wound structure meets the design requirements.

The teachers of the polymer teaching and research office are all from chemistry. Mathematics is not good, so there are some obstacles to computing such models. But for Xia Yangjie, who is quite talented in mathematics, this model is as simple as a few exercises on differential geometry. He solved these problems that have puzzled everyone for a long time. What no one had thought of was these exercises, which made Xia Yangjie fascinated with the field and got out of hand.

The density, angle, and manner of fiber overlap of fiber winding have a significant impact on the performance of fiber winding products. The influence mechanism is not so much a chemical issue. It might as well be a very fascinating mathematical problem. In addition, traditional fiber winding products are mainly convex symmetrical rotating bodies. For asymmetrical products or so-called double concave rotating bodies, how to realize the winding process is also a subject that requires a lot of space calculation. All these topics. Xia Yangjie felt so much fun.

After completing the tasks assigned by the teaching and research office, Xia Yangjie started his own research. He introduced a large number of mathematical concepts into polymer research, and proposed multi-degree-of-freedom fiber winding and laying models, as well as gradient projection methods based on the Jacobian matrix, weighted least squares methods based on svd decomposition, and inverse motion. Learn closed-loop solving methods and much more.

In any field. A person who is one step ahead is a genius, and a person who is a dozen steps ahead is a lunatic. Xia Yangjie's research on the theory of fiber winding was more than ten steps ahead of his peers.

In the entire polymer teaching and research department, no one knows what Xia Yangjie is doing. The differential geometry formulas he wrote, no one except him himself can understand, nor do they know what this thing does. Xia Yangjie couldn't find a colleague in the teaching and research department who could discuss the problem with himself. He wrote an article to submit it, and the editors of the editorial department did not know whether he wrote it right or not. In four years, he did not even publish a paper. So in the eyes of department heads and colleagues, he has become a waste of learning nothing but using mathematical formulas.

This time Qin Hai and Lu Xiaolin came to the Chemical Engineering Department to hold a seminar. The Academic Secretary also informed Xia Yangjie to attend the meeting. Understand his theory. Besides, he is not very attractive himself, so why go to the fun? So, during the meeting, he stayed in the teaching room himself, deducing formulas that only he could understand.

The teachers of the teaching and research room were ridiculed by Qin Hai at the conference hall, all of them were ashamed and speechless. After returning to the teaching and research department, everyone talked about the setbacks they suffered today. In addition to the indignation, some people felt that Qin Hai's knowledge was indeed extraordinary. Some of the research directions he proposed were really enlightening to himself.

During this period, a teacher who had a good relationship with Xia Yangjie on a weekday knocked on Xia Yangjie's desk and said to him casually: "Xiao Xia, it is a pity that you did not go today. If you go, you may take the localization office That little young man gave the town. "

"What do you mean?" Xia Yangjie pushed the myopia glasses on his nose and looked up puzzledly.

"Today, the China Nationalization Office has come up with a pretty young man, which has devalued us all. I wondered, we do n’t understand what you usually do. If you say to the young man, maybe you can Say him, at least we won't annihilate the whole army, "said the teacher half-jokingly.

In fact, what he thought was another thing. He hoped that Xia Yangjie would also participate in this meeting, and he was also devalued by Qin Hai, so that his psychology would be balanced. The ancients spoke well. Good things should be enjoyed by themselves, and when they are unlucky, they should pull others together. This teacher has always admired such ancient teachings.

Xia Yangjie didn't think so much, he just asked strangely: "What kind of young man can depreciate our entire teaching and research office, what did he say?"

The teacher introduced important content to Xia Yangjie and said, "Yes, Xiaoxia, aren't you doing any kind of fiber winding? I think there is also a question about the free-form fiber winding process in the topics they listed. Don't you try it? "

"Free-form fiber winding process?" Xia Yangjie's eyes lit up. "Do they really say that?"

The teacher threw the materials from the venue in front of Xia Yangjie and said, "Look at it for yourself, I don't understand this field, I don't know if they're right."

Xia Yangjie opened the information and saw the problem mentioned by the teacher at a glance. He read the explanation and requirements of the problem twice at a glance, only to feel that his heart was hot, and he stood up.

"Mr. Hu, where are they?" Xia Yangjie asked.

Teacher Hu surnamed with a finger and said, "Mr. Qian sent them out. It shouldn't have gone far. Why, Xiaoxia, are you really going to find them?"

"I ... I ..." Xia Yangjie gave up and said twice, I don't know what to say. He smiled apologetically to Teacher Hu, and then pulled out a notebook from the drawer, held it in his arms, and rushed out of the teaching and research room.

"Lao Hu, what's wrong with Xiao Xia?" Someone noticed Xia Yangjie's strangeness and turned back to ask Hu teacher.

Teacher Hu said with a smile: "I just told Xiaoxia two things at the meeting just now. Xiaoxia probably went after the two young men who made the localization office."

"Haha, I think Xiao Xia and them are in perfect harmony, and they are a bit unattainable." A teacher commented sourly.

"You can't say that. The other person's name is Qu Gao and Widow, because you have no appreciation level, and you can't hear the elegance." Another teacher said in the same weird tone.

"Oh, it's really high and widowed. However, I'm still better as my chinman, Yangchun Baixue, we can't get it." The teacher said in a leisurely way ~ www.readwn.com ~ these ancient intellectuals of the old generation The skills are very good. Although they are a group of people engaged in chemistry, they are no strangers to allusions.

Xia Yangjie didn't know how others were talking about him. Even if he knew it, he wouldn't care, because in recent years, there have been many such comments that he had heard secretly. He ran out of the office building, came outdoors, looked up towards the school gate, and saw two young men obviously different from the school teacher and student costumes walking side by side and chasing after him. At this time, when Qin Hai and Lu Xiaolin heard the footsteps behind them, they both stopped and looked back. Xia Yangjie asked out loud, "Excuse me, are you two Pusang localization offices?"

"Yes, we are localized. Excuse me ..." Qin Hai asked calmly.

"My name is Xia Yangjie. I am from the Polymer Teaching and Research Department of the Chemical Engineering Department. I am studying the theory of fiber winding, but I am ashamed of nothing. I want to ask, do you really want to do research on free-form fiber winding? Answered upside down. (To be continued ...)

ps: This chapter counts at eight o'clock in the morning. I didn't expect it would be so difficult to write ... Fiber entanglement is a very complicated and complicated issue. I can hardly read oranges when I read papers. I hope that the concepts in the article are not wrong, as for the accuracy, then it is unnecessary. Finally ... ask for a monthly pass.