What is the principle of shell explosion?

Although the impact of the projectile is great, the fuze is closed when the projectile is launched, and the fuze cannot be triggered at this time, so the projectile will not explode. During the launching process, some shells are unlocked by inertia, and some are unlocked by the centrifugal force of the body rotation. In any case, only after unlocking, the fuse touches the ground and the shell will explode.

Because the shell is going to explode, there must be a fuse. On the other hand, most of the explosives used now are stable in nature, and some are insensitive to friction and vibration. Even if you are shot, it is not easy to explode. Even if you encounter an open flame, it will not explode, but will burn slowly. Fuze is an important device to trigger the explosion of the charge in the weapon, which is equivalent to a switch to control when the weapon explodes. If the weapon has no fuse or the fuse can't work normally, then even if the charge in the weapon has the power of Conan the destroyer, such a weapon can't detonate normally and can only be a decoration.

Ancient craftsmen in China once invented flowering bombs without detonators. The fuse is a tube with lead pellets stuck to the bottom and fixed with wax. In front of the fuse is a small pottery bottle with red-hot charcoal inside and gunpowder outside. When the shell is launched, the lead bullet will be pressed to the bottom of the tube because of inertia, and the projectile will not move. Once the shell hits the ground, the lead bullet will rush forward at high speed, smashing the clay pot, and the gunpowder will collide with the red-hot charcoal and explode immediately.

When firing, the force of gunpowder is to push the warhead forward. The head of the projectile is affected by inertia, and all components inside the warhead tend to move backwards, which is opposite to the direction of the projectile. When the warhead touches the ground, the force exerted by the ground on the warhead is to prevent the warhead from moving backwards. Due to the inertia of motion, the inner element moves forward in the same direction as the shell. Using these two directional characteristics of motion, the safety will be opened when launching, and the fuse will be triggered when touching the ground, thus exploding.

The shell explosion is detonated by a fuse, and the core of the fuse is a detonator. According to the different functions of fuze, it can be divided into mechanical trigger, timing and electronic fuze. The fuse is equipped with a safety device. Theoretically, the fuse will not be disarmed until it leaves the muzzle. Finally, the shell explosion must detonate the bomb through the fuse. After the fuse was disarmed, it reached the target. According to the different fuses, the detonator is detonated by collision, time and electronic device, and then the detonator detonates the bomb. Of course, the fuze will not be completely qualified, so some will explode in the gun bore, and some will not explode even if they hit the target, becoming duds.