With the continuous progress of science and technology, weapons and ammunition have also developed greatly, among which there are many kinds of bullets, such as armor-piercing bombs, incendiary bombs, Damme bombs and so on. Although the power of the bullet has become greater, it has also aroused our curiosity. The bullet is so powerful in the launching process, why can't it hurt the shell casing? Today we will talk about this topic.

First of all, shell injury is not a special case. The well-known "chamber explosion" is actually a phenomenon after the shell is injured. The cause of the explosion is nothing more than the deformation of the barrel, foreign objects in the barrel, and obstacles in the process of bullet firing. However, it can be seen from these problems that no matter how powerful the bullet is, it will not be the cause of the explosion. Why?

When the bullet is fired, the primer ignites the propellant, and the propellant instantly explodes to generate high-pressure gas, which pushes the bullet out of the shell through volume expansion and generates a spiral in the bore through the rifling, thus hitting the target.

Many people think that bullets and casings are integrated, and some netizens even think that bullets and casings are welded. In fact, the relationship between the bullet and the shell casing is more like a barrel container with a sharp plug inside. The bullet shell is a cylinder with a bottom and no cover, and the bullet is directly inserted into the shell. It is worth noting that although it is inserted, it is still tight and will not fall off easily.

The reason why the cartridge case will not be instantly injured by the propellant is that the pressure relief direction of the propellant is all concentrated on the warhead at the moment of ignition. After the bullet is pushed out of the casing, it will not explode under decompression. In addition, the cartridge case is wrapped by the gun bore from beginning to end, and the propellant will be absorbed by the gun bore after explosion. Because the strength of the gun bore is much higher than that of the shell casing, even if the propellant is powerful, it will not explode. Unless the gun is not well maintained at ordinary times and the gun strength is not enough due to cracks, it will not explode.

Many people think that when a gun fires a bullet, the propellant in the casing is the energy generated by the explosion, but the actual situation is that the propellant converts energy through high-speed combustion, so the probability of explosion will be much smaller.

When a bullet is fired inside a firearm, the energy generated is usually calculated by "chamber pressure". For example, the domestic Type 95 automatic rifle uses a 5.8X42mm bullet, and the casing contains 1.69 g propellant, which can generate a bore pressure of 3200kg /cm2 during the bullet firing. It is precisely because of such a strong chamber pressure that the bullet will be powered.

It is also worth noting that the high temperature and high pressure gas produced by propellant is not produced in the shell, but in the barrel, which means that it is the barrel that bears great pressure and impact, which also explains why the barrel is the most damaged during explosion.

At present, the propellant of bullet primer is generally high-sensitivity high-energy explosive. It can be seen from the literal meaning that this kind of explosive is extremely sensitive and easy to explode. As far as the main composition of propellant is concerned, lead azide is also an important factor and initiation condition that can meet the ignition rate.

Although high-sensitivity high explosive is easy to explode, it still needs to hit the primer violently through the firing pin. According to relevant data, the impact force of a successfully launched bullet must be greater than 2kg, indicating that the amount of propellant in the bullet must be strictly controlled, otherwise it is easy to misfire.

At present, the propellant on the arms market can reach an impact force of 5300 meters per second. Because the impact force is too fast, the propellant in the shell has not burned out at the moment when the bullet is fired, and the bullet has jumped out of the shell, so it will not explode.

If the chamber of a weapon explodes, it can basically be judged that the chamber pressure is greater than the length of the barrel, or the quality of the shell itself. However, the quality problem of firearms is rarely seen in the current arms weapons.

Compared with traditional weapons, people's imagination of future weapons never stops, and most people think that shell casings are of little use. After all, future weapons are closer to laser weapons. But at present, it is still too early for firearms to abandon the law of shell casings. Even if there are shellless rifles or combustible shells, shells will become the mainstream bullet parts from the perspective of cost.