After lunch, Shen Xiang and Yang Zhengang went back to the army first, Jiang Nan played at Lu Zhixin's house for an afternoon, and in the evening Xiao Yuehong made dinner early for them to eat, and after a while, Dashan drove over to send them back to school.

When Jiang Nan was on the road, he kept thinking, Zhengang was on a dangerous mission this time, what could he do for him?

The most likely injuries during action are knife wounds, gunshot wounds or blow wounds.

There is no way to injure yourself, and it is unlikely that a knife wound will cause serious injuries at Yang Zhengang's fighting level, the most common is a gunshot wound, can you make body armor to prevent gunshot wounds, at least it can alleviate the injury and not kill you.

At this time, body armor was still rare, even in later generations, it was not used much in the army, and it was generally used when the special police went out to the police, after all, this kind of thing was expensive and unrealistic to use on a large scale.

But if you only make one, it should still be possible, I'm afraid that you can't buy bulletproof materials during this period.

Thinking like this, Jiang Nan decided not to go back to school first, and asked Dashan to send Lu Zhixin back to school first and send her home.

When she got home, she immediately called Xiao Jingwen and asked him to come to the house.

As a result, Xiao Jingheng and Xiao Jingwen came together, and when they entered the door, they asked, "Did you think of any new products again?" ”

Jiang Nan nodded, "Yes and no!" ”

If this thing is made, it will be very useful, and it can be regarded as a new product, so I am afraid that it will not be made.

"How?" Xiao Jingheng and Xiao Jingwen were very curious, they had never seen Jiang Nan so uncertain.

"Sit down first!" Jiang Nan said, took out a pen and paper and put it on the table, and several people sat down.

"Because Zhengang is going on a mission, I heard that this mission is very dangerous, and I want to make a body armor for him." Jiang Nan said.

"Body armor?" Both of them exclaimed, they had only seen it in foreign magazines, but they had never seen the real thing, and they could make this thing themselves?

"Of course it's very difficult, that's why I called you here to see if Jingwen has any way." Jiang Nan said.

"Let's just make a bulletproof vest!" Jiang Nan said and drew the outline of a person, "The main parts of a person who are shot are the head, limbs and torso. The head is generally helmmeted, although the helmet is not bulletproof, but after all, the target is small, and injuries to the limbs are generally not fatal. ”

"The most important thing is the torso, one is that the target is easy to shoot, and the other is the internal organs, once the internal organs are injured and the internal organs are not operated in time to cause organ failure, or massive bleeding, it is easy to be fatal. So our focus is to protect this ......."

Jiang Nan drew a circle on the part of the torso with a pen, and focused on the position of the heart, "Especially the heart, once it hits, it will definitely die." ”

Xiao Jingwen and Xiao Jingheng both nodded, but this is not the point, the point is how to make body armor.

"The main materials I know of bulletproof are metal, fiberglass, ceramics, nylon, etc......," Jiang Nan said.

"But none of these things can protect against bullets." Xiao Jingwen couldn't help but speak.

"I know, so we have to look for high-strength materials, high-strength steel, high-strength ceramics, high-strength glass......," Jiang Nan said.

"I'm afraid it's hard to find these materials." Xiao Jingwen shook his head.

"If it's easy to find, I won't look for you." Jiang Nan glanced at him.

"In fact, there is another material, called Kevlar, which is a kind of aramid, which is a soft bulletproof material, its high temperature resistance and strength resistance are five times that of high-strength steel, and it is very light, but I don't know if there is such a material in China." Jiang Nan said.

Xiao Jingwen looked at Jiang Nan in surprise, she even knew this, and she didn't know that she thought she was majoring in materials.

In fact, this is also due to Jiang Nan's experience on the battlefield abroad in his previous life, when there were many soldiers from different countries, and there was a soldier from country M who always boasted about his body armor in front of Jiang Nan, saying that it was the most advanced in the world, and he used Kevlar.

Later, she inquired with a knowledgeable person, and it turned out that it was really a great body armor, that person didn't brag, and by the way, he also learned about the history of body armor, so Jiang Nan knew this.

Xiao Jingwen is a physics major and naturally knows aramid, but Kevlar is the first time he has heard of it.

Jiang Nan then painted, "In fact, body armor is the same as our cotton vest, with a layer of cloth inside, cotton in the middle, and a layer of cloth outside, but these fabrics are replaced with high-strength fibers, and the sandwich is bulletproof material." ”

"We can make the bulletproof material in the middle one by one, sewn it in the middle of the fiber cloth, just like the ancient armor, some armor is a whole piece, and some are like scales, it is difficult to make a whole piece of high-strength materials, we will make a small piece of it, and it has the same defensive ability!"

"In fact, bulletproof does not really completely prevent bullets from entering the body, but only plays a cushioning role to reduce the damage caused by bullets to the body, after all, there is a big difference between bullets only staying on the surface of the body and entering the body."

"When the bullet is fired at a high speed, the outermost layer of high-strength fibers plays a certain cushioning role, but it is not enough to block the bullet from advancing, and the fiber ruptures and enters the second layer, and if the second layer cannot be prevented, there is a third layer, even if the bullet enters the body again, it has been greatly cushioned, which greatly reduces the damage to the body."

"The main thing now is whether or not we can find these materials!" Xiao Jingwen said.

Jiang Nan nodded, this is the hardest part, "So I want you to think about whether you know what high-strength materials are, and the time is very tight, Zhengang will leave in a week." ”

"A week?" Xiao Jingwen exclaimed, "This body armor may not be made even if it is half a year or a year." ”

"You don't have to do it so well, it's better to have a little effect than nothing." Jiang Nan said. The body armor of later generations was also upgraded from generation to generation, and it was not very good at the beginning.

"Okay, I'll go find the materials right away, and I'll ask my former mentors and my former colleagues at the Institute of Physics to see if they know." Xiao Jingwen nodded.

"Then please." Jiang Nan said.

"I'll do my best." Xiao Jingwen nodded, even if it wasn't for Yang Zhengang, what a great achievement it would be if he could make body armor, that is, from a business point of view, there is a huge market at home and abroad.

"I support you, it doesn't matter how much it costs!" Xiao Jingheng spoke.

Jiang Nan was very moved, with these brothers helping her, she was not worried at all.

The next day, Xiao Jingwen began to inquire everywhere where there were various high-strength materials.

First of all, Kevlar, I heard that at this time, country M already had this material, but there was no one in the country, and probably because this is the best material for bulletproof, country M fundamentally restricted the export of this material.

Xiao Jingheng asked several foreign companies he cooperated with, and they all said that there was no way.

If you really don't have it, you can only replace it with a worse material, and something is better than nothing. I want to talk about "Rebirth of the Eighty Prosperous Wedding Pets" with more like-minded people, pay attention to "excellent reading literature" on WeChat, talk about life, and find confidants~