The Literary Life of a Science Leader

Chapter 70 Abaqus
It is not well known that dislocations are divided into three categories: edge dislocations, screw dislocations and mixed dislocations.

Edge dislocations are divided into positive edge dislocations and negative edge dislocations, and screw dislocations are also divided into left-handed and right-handed. Adding mixed dislocations, there are a total of five types of dislocations, and the specific dislocation line The shapes and projections of atoms are varied.

Thompson's dislocation theory has five types, corresponding to the five types of dislocations, and then uses the dislocation equation as the core to build the entire dislocation system.

The dislocation theory I presented by Mu Jingchi is a theory about positive edge dislocations.

In 2069, the research on dislocations deepened, and the positive edge dislocations were also dissected, and the research on them was more complicated than it is now.

The structural definition of positive edge dislocations has spread, and many local slip modes that have not been discovered so far have been attributed to positive edge dislocations.

As the person in charge of the project, Mu Jingchi naturally has to carry out project research, and it is the focus.

Because he is very familiar with this theory, he directly started to conduct research in the form of aluminum alloys. After all, Mu Jingchi is more experienced in aluminum alloys now.

Other postgraduate students can only start their research with general metal materials.

To put it simply, it is to obtain massive and detailed data through repeated material experiments and experimental observations of dislocations, and then find a line to clarify the relationship between various dislocations in this massive data.

And this line is the first step of touch theory Ⅰ.

However, it is extremely complicated to find such a connection line, and there is basically no tricky method. Experimental testing is combined with mathematical and physical methods to carry out theoretical analysis and mathematical calculations.

Dislocations are very complicated, and a material experiment can yield massive amounts of data.

Among them, there are data on dislocation density and crystal deformation rate, data on dislocation density and crystal strength, data on stress field, elastic energy, and line tension, and data on the interaction between dislocations, which cause dislocation slippage. The data of displacement force, the start force Pai-Nali data of dislocation, the value-added data of dislocation, and the data of delivery of dislocation, etc.

Such material experiments often require hundreds, thousands, or even tens of thousands of times.

Sometimes the simulation is very perfect, as if all the roads are clear, but when the experiment is actually carried out, it will fail inexplicably.

The accumulated data cannot be thrown away, but needs to be analyzed.

Among these huge amounts of data, Mu Jingchi and the others also need to eliminate data about other types of dislocations, and specialize in the data of positive edge dislocations.

It can be said that this is an extremely difficult, complicated and boring research.

And this is only the first step of theory I. This is the real understanding of the root of positive edge dislocation, and then the control of positive edge dislocation is the key point.

···
Time goes round and round.

"Come here today!"

Mu Jingchi finished his experiment, took off his white coat, and said to the other graduate students.Wearing a white coat means seriousness, responsibility, and rigor, giving people an image of a scientist and a sense of security.

"I don't take up your time and energy, and you can start working on your own projects." Mu Jingchi had a faint smile on his face, "If you have any problems with your own projects, you can come to me. "

When students are in graduate school, it is normal for students to encounter difficulties in their own topics and papers.

But sometimes, graduate tutors don't care about these, and are not responsible for solving this problem, and the students are left to figure it out by themselves, either by using experimental methods to check, or by scanning the literature to search for information.

In this way, it takes up a lot of time and energy of the students.

Mu Jingchi pulled them into his project team, and this is where they can be better than other mentors.He has a profound amount of knowledge, and he also has the mind to help solve students' problems.

Seeing Mu Jingchi, the person in charge of the project, leave the research laboratory first, the four master students all looked at each other in blank dismay, and then all looked at Ai Xiaosheng, who was more familiar with Mu Jingchi.

Although it is Huaqing University, the scientific research environment is better than other schools, but they did not expect this to be the case!Now the time is 05:30, it is time for dinner, and it is also the time for get off work outside the unit.

But there is absolutely no scientific research project team that ends the experimental project at this point in time, and the instruments and equipment are still running?
Can you say that you are doing scientific research if you are not busy until eight or nine in the evening?

Some project teams can even delay until 996 or [-] o'clock at night. Compared with the bald material research, the [-] of those Internet companies is really a blessing.

"If the equipment is still running, leave after the results come out; if you don't use the equipment, now divide the experimental steps, save the data, and save the mobile hard disk and network disk, and then you can leave."

As the deputy of the project, Ai Xiaosheng naturally knew what Mu Jingchi was used to, so he dispelled the worries of these graduate students.

"Don't worry, this is Dr. Mu's habit." Ai Xiaosheng also smiled, "The Z325 aluminum alloy project team that Dr. Mu was in before, he always left at this point, but this does not affect his scientific research capabilities. "

···
"Chizi, wait."

Mu Jingchi, who was walking through the corridor of Caiyan Building and was about to leave, was stopped by a familiar voice, it was Zhang Chuyang.

Turning around, she looked at Zhang Chuyang with puzzled eyes, "What's wrong?"

"Come and take a look with me. There is something wrong with my data." Zhang Chuyang came over and dragged Mu Jingchi into his laboratory, where there were instruments and equipment in operation.

"My data always feels that something is wrong, but I don't know what's wrong."

Following Zhang Chuyang's guidance, Mu Jingchi looked at the screen, on which was ABAQUS 6.20 software, which displayed multiple data about material fracture failure.

ABAQUS is a powerful finite element software for engineering simulation, which can solve problems ranging from relatively simple linear analysis to many complex nonlinear problems.

It includes a rich library of elements that can model arbitrary geometries.And it has various types of material model libraries, which can simulate the performance of typical engineering materials, including metals, rubber, polymer materials, composite materials, reinforced concrete, compressible hyperelastic foam materials, and soil and rock materials.

ABAQUS software is dedicated to complex and in-depth engineering problems, and its powerful nonlinear analysis functions have been widely recognized by high-end user groups in design and research.

Zhang Chuyang naturally used this finite element software for the subject of fracture failure.

"There is a problem."

There is a lot of material research, and some relevant data can give a general feeling or intuition. After looking at it, Mu Jingchi feels that there is indeed a problem with the data.

(End of this chapter)