Mu Jingchi is not very good at fracture mechanics, and he is not familiar with the topic of fracture failure.

The material does not say that one law can be used and all laws can be used, so Mu Jingchi can only slowly find the problem.

"Yes, do aviation. ”

This is Zhang Chuyang's own topic, although the focus of the project is still the direction of material fracture and failure, but Zhang Chuyang chose aviation materials, which are suitable for materials on large aircraft.

Zhang Chuyang was also scratched the back of his head when Mu Jingchi said this, "Give it a try." ”

Seeing that Mu Jingchi, who was not as good as himself before, has become the person in charge of the national project, Zhang Chuyang naturally wants to rise. Mu Jingchi started with the engine materials of automobiles, so Zhang Chuyang engaged in aviation materials.

Of course, it's not an aero engine material.

The materials suitable for aero engines are more complex than those for automobile engines, and the requirements are also higher, not at the same level.

Mu Jingchi pursues upwards, that is, the expansion module used.

Abaqus provides a powerful tool for modeling crack propagation in arbitrary paths independent of element boundaries, and this module can be combined with other capabilities of Abaqus to predict the durability and damage tolerance of aircraft material structures.

It can also assist in assessing crack initiation and growth in pressure materials.

"No problem here. ”

Mu Jingchi looked at these data, and the results were indeed a little wrong, and there was a gap between them and the theoretical analysis. But the software runs this step of getting the data without any problems.

"Is there something wrong with the mathematical model?"

Mu Jingchi did not find any problems in the operation of the software, and this situation is still rare, so he put forward other conjectures.

"Look at it. ”

Zhang Chuyang continued to call up the data, and with these data supplemented by computer calculations, a mathematical model could be derived.

"There's something wrong with the data here. ”

At first glance, the model looks fine, but from the point of view of structural mechanics, the values are normal, and occasional errors are allowed.

But tracing back to the data that calculated the mathematical model, Mu Jingchi immediately discovered the problem.

"No problem? I've done it many times. ”

Zhang Chuyang lowered his body and looked at the data problem pointed out by Mu Jingchi seriously, a little skeptical.

Mu Jingchi shook his head, "How do you calculate?"

Not all calculations are left to computers, and many are done mathematically.

"You see, it shouldn't be calculated like this here, although the S-N curve and fatigue limit of metal materials are calculated accurately, but this is only one aspect... ”

Here, according to Karl's first theorem, the rate of change of the strain energy of an elastic member with respect to the displacement corresponding to a certain load on the member is equal to the value of the load. The values are true, but they don't match the stress-strain curve of the material... ”

"Finally, there are the abrupt stresses and stress-time history... ”

What Mu Jingchi said was all about the mechanics of materials, which was exactly what he was learning these nights.

"Although these are minor problems, they affect the mathematical model, and the model deviates from the theoretical analysis, and then it leads to the final output of the data that is obviously wrong. ”

There is an intersection of knowledge, especially for mechanics. Obviously, Zhang Chuyang has made a lot of progress in fracture mechanics, and it can be said that Mu Jingchi does not understand many aspects at all, but Zhang Chuyang has not done a good job in the integration and synchronization of material mechanics and fracture mechanics.

There are some detailed problems, which are considered here, but ignored there, and lack of meticulous link combing.

"Yes, yes, yes!"

After Mu Jingchi said this, Zhang Chuyang immediately reacted, "Hey, there have been so many things recently, so busy that I even ignore this basic problem." ”

Zhang Chuyang did not encounter this kind of problem when he participated in the department project before, because someone gave him the finishing touch, and when he encountered the problem, other senior brothers and sisters found out.

But this is his own subject, and he has to do everything by himself, and all kinds of problems will inevitably arise.

Fortunately, this is the beginning of the project, and it is good to solve the problem when encountered, but I am afraid that I will not be able to find a solution to the problem, or even find the cause of the problem.

"Look at the point, don't be in a hurry, scientific research is a grinding effort, and it's a good thing that problems arise. ”

···

As soon as Mu Jingchi opened the door, he saw a picture of killing a dog.

The dog he killed was Mu Jingchi.

Lao Mu and Lao Ji were busy in the kitchen together, and when they opened the door, it was the time for Lao Ji to feed Lao Mu food, but Lao Mu was unwilling to turn his head around, so Lao Ji bit directly on his mouth, and then fed him with a kiss.

The sound of the door opening was not loud, and both of them were immersed in the sweet atmosphere of the kitchen, so they didn't notice it at all.

Cough!

It wasn't until Mu Jingchi coughed deliberately that the old couple reacted and immediately separated.

"When I came up just now, I happened to meet Aunt Zhao next door, and we also happened to buy some fresh ingredients, so I sent her over to try them. ”

Saying that, Lao Mu didn't care about Mu Jingchi's eyes, directly picked up a bag of vegetables on the kitchen table, and went out.

Mu Jingchi was speechless for a while.

The bag is full of pork at all, although the price of pigs has risen, but people who can afford to buy a house in this community should not be able to afford to eat pork.

Perhaps, this is NetEase's black pork?

Mu Jingchi threw out the messy thoughts in his mind and looked at Lao Ji.

Well, sure enough, men's skins are thicker than women's, and my mother was embarrassed to find an excuse to run out, but my father didn't react and continued to work in the kitchen on his own.

Seeing Mu Jingchi looking over, he also threw out a sentence, "The meal will be ready soon, go and sit on the sofa for a while." ”

Mu Jingchi nodded, hung up his backpack, put the key away, changed into slippers and walked into the living room. The TV in the living room was on, but the person sitting on the couch was not watching TV at all, but playing a mobile game.

Walk over and take a look.

Di Renjie has 7 kills, 0 deaths and 8 assists.

Ji Lingling's head quickly glanced over at Mu Jingchi, and then turned her head to continue her glorious cause, "Brother, you're back!"

"Hmm. ”

Mu Jingchi didn't have the heart to watch this game, but about Ji Lingling's previous thoughts, he still wanted to know the result, "Did Dad agree to your live broadcast?"

"I've agreed, I'm choosing a computer for live broadcasting. ”

Ji Lingling's eyes were still on the phone screen, but she still heard Mu Jingchi's words and nodded. "By the way, brother, I see that the computer in your study seems to be very luxurious, do you have any research on computers?

Although it is a live broadcast of "Glory of Kings" now, it is not good to say in the future, so it is best to have a special computer for live broadcasting.

"CPU: AMD 3900X, Motherboard: X570 ACE, Graphics: RTX 2080ti, Memory: G.SKILL DDR43600-frequency 8Gx4 Phantom Halberd, Solid State: Hikvision C2000 Pro 2T, Power Supply: Zhenhua leadex 1000W, Chassis: Lianli Gemini, Display: ASUS ROG Donkey Kong. ”

Mu Jingchi opened his mouth and threw out a configuration table, in order to make less trouble in the future, he directly gave Ji Lingling a flagship configuration, anyway, it is not that there is no money, as for the higher 3950x, it can't be bought, it's out of stock.