Chapter 748 Preliminary Tasks for LNG Ships

Liu Fangping and Lei Zhixing basically fit the most traditional character portrait of a science and engineering student.

Although he was very reserved when he first met Chang Haonan, he would become much more relaxed and his nervousness would be swept away as soon as he talked about things related to the project.

"Professor Chang."

This time, Lei Zhixing spoke first:

"To store and transport liquefied natural gas, the main difficulty in shipbuilding is probably structural safety."

Mechanics is a versatile profession that can be involved in anything in the material world.

Therefore, although he has not studied the shipbuilding industry in depth and the information in his hands is not complete, he can still get some inspiration from the projects he has done in the past.

Chang Haonan did not speak, but just stretched out his hand slightly, motioning the two to continue talking.

Liu Fangping, who was a little clumsy just now, took over the conversation this time:

"Most materials, especially metal materials containing iron, have strong nonlinear or even discrete characteristics in performance changes at extremely low temperatures. Structural characteristics such as strength, plasticity, fatigue life, etc. vary greatly and cannot be designed according to the experience of general equipment."

"When I was a doctoral student in rigidity, I followed my mentor to deal with an accident analysis of a container cracking and failure in a low-temperature liquid nitrogen storage tank. The reason found at the time was that the cold deformation of austenitic stainless steel caused strain-induced abnormal increase in martensite content, which eventually led to brittle failure of the head part."

"Although the temperature of LNG is not as extreme as liquid nitrogen, according to the data, it is about -60℃ under normal high-pressure storage conditions. However, compared with storage tanks on land, ships at sea are not a good storage platform. There is a high-temperature environment such as the power cabin inside the ship. Under normal circumstances, the temperature difference of the whole ship can be pulled up to 100℃ or more. If we consider that once LNG leaks, the low temperature of -168℃ will directly impact the hull structure, and the safety factor requirements..."

In just a few minutes after getting the information, he had said more than half an hour before.

Compared with Lei Zhixing, Liu Fangping's speech speed is slower, but from his eyes and expression, he is obviously thinking while speaking, instead of being at a loss like before on the sofa.

Since his undergraduate and master's degrees are both science, he obviously cannot compare with the former in terms of project experience, who has been running around with Yan Yongnian since his senior year.

However, for the same reason, he is often better at analyzing the essence of the problem:

"Professor Chang, I think, before going to Hudong, it is best to do some preliminary research on the relationship between temperature changes in elastic bodies and thermal stress and thermal strain, especially the coupling relationship between structural temperature field functions, heat conduction equations and thermoelastic motion equations, and then establish a relatively accurate hull structure model. Otherwise, if you just go around, I'm afraid you won't get much."

When talking about the field he is relatively familiar with, Liu Fangping's speech speed gradually became normal from the slowness at the beginning.

Of course, the "normal" here is based on the standards of most people.

For him, it should be very fast.

After finishing that paragraph, Liu Fangping's face, which was originally a little black, turned red.

Chang Haonan was so scared that he quickly handed him a bottle of water.

Lei Zhixing, who was standing next to him, was obviously used to it and was still looking down at the documents in front of him.

When Liu Fangping expressed his opinion just now, he kept nodding beside him, obviously agreeing with the other party's opinion, but now he frowned and looked troubled:

"But in terms of time... if we want to start from scratch, firstly, neither of us has systematically studied thermodynamics in the past, and secondly, studying low-temperature topics requires special ultra-low temperature equipment... I'm afraid it won't be easy to solve in a short time."

"Uh... then take your time?"

At this time, Liu Fangping drank a few sips of water, and his face had returned to normal.

Of course, his speaking speed also returned to the previous slow state.

"Well... but looking at the meaning of this document, Hudong Shipyard seems to want to compete with Bang... uh, Samsung Offshore in South Korea for the dominant position in the GTT Group's second-generation liquid cargo tank technology shipping order. According to their estimation, the key time node of this round of competition should be at the latest in 2002-2003. In other words, a plan, or at least key technology, must be put forward before then, and time is not abundant..."

Lei Zhixing shook his head while flipping through the documents.

Chang Haonan gradually began to understand why Yan Yongnian accepted two disciples at the same time.

Lei Zhixing and Liu Fangping are indeed complementary in many ways.

Each of them has significant flaws, but when put together, they can play the effect of 1+1 greater than 2.

Chang Haonan himself felt a little sorry that such a pair of live treasures were intercepted in this way.

So he quickly thanked Yan Yongnian in his heart.

Then he said:

"For the equipment problem, I can contact the Huaxia Institute of Atomic Energy. They should have relatively complete ultra-low temperature research equipment."

"Is this... for... the nuclear industry system?"

Lei Zhixing, who was just distressed, was obviously not used to the new boss's amazing connections. He just looked at Chang Haonan with astonishment.

The latter nodded:

"In the planned economy era, our country's cryogenic engineering has always been studied by the nuclear industry system. Although many universities have opened cryogenic disciplines in energy, machinery or physics later, they are not as complete as their systems, and most of them are still in theory or laboratory research."

"Moreover, it's not just equipment. They should have accumulated some achievements in cryogenic materials in the past, which should also be meaningful for this project."

The former Nuclear Industry Corporation has now been divided into two, but it still accepts the leadership of the Science and Technology Commission in terms of business. With Chang Haonan's current position in the Science and Technology Commission, it is just a matter of words to use the equipment there.

"As for the starting point of the research..."

Chang Haonan leaned back on the chair:

"I suggest starting from the theory of thermoelasticity, which mainly includes thermodynamic field theory, heat conduction and elasticity. For you, especially Teacher Lei, there should not be a particularly high threshold."

Even the research direction has been pointed out, Lei Zhixing and Liu Fangping obviously can't ask for more.

After all, they are teachers in Chang Haonan's research group, not graduate students under Chang Haonan.

If they still have to be fed by others, it would be a waste of so many years of study.

"Then Professor Chang, we will move to the dormitory here at Jinghang as soon as we return."

Liu Fangping immediately expressed his opinion:

"Also... as for the office location, will it be here with you?"

Chang Haonan nodded:

"The new laboratory building of our laboratory is still under construction. Currently, we can only work in the computing center. Your office is downstairs. I will have someone clean it up as soon as possible."

The calm answer sounded completely different to the ears of the other people -

New laboratory building!

You know, the funding of colleges and universities has been tight in recent years. Most laboratories, even those at the national level, can only use the rooms cleared out by others for renovation.

Those who choose to enter colleges and universities these days are basically not materialistic people.

But not materialistic and not liking material things are two different concepts.

Apart from anything else, even if you really focus on academics, better material conditions will undoubtedly bring higher research efficiency.

Lei Zhixing, who graduated from engineering from undergraduate to doctoral studies, understands this point very clearly.

Foreign researchers can get the results after just one or two attempts, but in their group, it often takes several days or even weeks to complete because of the lack of equipment or raw materials.

Unconsciously, the research efficiency has been pulled apart by others.

Thinking of this, he was convinced again that he should have made the right choice.

"Okay, then we will try to start work tomorrow!"

...

After seeing off Liu Fangping and Lei Zhixing, Chang Haonan also breathed a sigh of relief.

Although he is experienced in projects, this is his first time leading a research group.

The other three are novice lecturers, but he is actually a novice professor.

Everyone has little experience and can only grope their way through.

"Senior sister."

Chang Haonan looked at Yao Mengna, who had been silent just now:

"Regarding your project, I may need to find a suitable one..."

The latter waved her hand:

"There is no rush. It just so happens that the No. 112 project has some finishing tasks for the capacity ramp-up project of Project 11. I have to go to Shengjing in the next two months. As long as I can have something to do after the next semester starts, it will be fine."

"That's definitely no problem."

The fall semester starts in September. More than two months is enough for Chang Haonan to complete a project, so finding a project for Yao Mengna is definitely not a problem.

"Speaking of which..."

Yao Mengna changed to a relaxed tone:

"You just said that we have a new laboratory building, but I have been in school these two days, and I don't think I saw the groundbreaking?"

"Of course it is not in the current campus."

Chang Haonan explained with a smile:

"Beijing has allocated a piece of land outside the North Fourth Ring Road for our laboratory to build a school-enterprise joint experimental center, with an area of ​​about 100 acres."

Yao Mengna's eyes widened immediately.