A certain shipborne electromagnetic gun. It has a high speed of more than 8 Mach and a range of more than 200 kilometers. It can still accurately hit the sea target. A tungsten alloy projectile with a weight of only a dozen kilograms can kill as much as a few tons of anti-ship. missile. Then there are users questioning that a dozen kilograms of projectiles are not as big as apples. Once they hit a ship, they only make a hole. How do you achieve a big kill? The actual idea is to take the effect of the collision of medium and low-speed objects and the impact of the projectile that we usually see, and imagine that the aftereffect of the collision of ultra-high-speed objects is actually wrong. Because objects with more than 5 times the speed of sound collide with each other, it is an ultra-high-speed collision. The physical and chemical collision aftereffect at this time is very different from the collision effect we usually see. High-speed collision is a collision between macroscopic objects as high-speed relative motion, and is explosive mechanics. A research content. High-speed collisions can cause severe deformation, damage, and even melting and gasification of macroscopic objects. A collision of meteorites in nature or a collision between a meteoroid and a spacecraft.
Collision between high-speed armor-piercing projectiles and armor in conventional weapons, collisions between metal plates in the explosive welding process, etc. are all areas of high-speed collision. The high-speed collision between the shell and the target is a new topic in high-speed collision research. High-speed collisions will release huge amounts of energy. In physics, it belongs to the TNT equivalent of moving objects. The energy that causes the colliding object to deform, destroy, or even melt and vaporize is derived from the kinetic energy of the object before the collision. . The greater the relative motion between objects, the greater the energy released during a collision. Therefore, the magnitude of kinetic energy, especially the magnitude of kinetic energy per unit mass, ie energy density, is a sign of the degree of damage caused by collision. The kinetic energy of a moving object is usually expressed by the TNT trinitrotoluene equivalent. The standard energy per gram of TNT is 1 kcal, and the kinetic energy of 1 gram of material moving at a speed of 1 km per second is 500 joules, which is equivalent to about 0.1196 kcal, so the TNT equivalent is 0.1196 g. If the mass of the object is Μkg and the speed of motion is v km/sec, the TNT equivalent of its kinetic energy is 119.6Μv. For example, blasting 1 cubic meter of hard rock requires 1 kilogram of TNT explosive.
Therefore, such as quality The 1 kilogram shell is completely broken by 1 cubic meter of hard rock. The speed of the shell must be 2 kilometers per second. In nature, meteoroids move at a speed of 10 to tens of kilometers per second relative to the ground. At a distance of 40 kilometers per second, the TNT equivalent per ton of meteoroids is about 191 tons, which is a very powerful figure. The collision of meteorites with the Earth, the Moon, and other planets and satellites, the collision of meteoroids with satellites or spacecraft. When a meteoroid enters the atmosphere, aerodynamic heating causes ablation to lose mass to the meteoroid. Since the momentum of a meteoroid is proportional to the mass, the air resistance and meteoracting on the meteoroid The third of the body mass is proportional to the square. Therefore, only large meteoroids can fall through the atmosphere to the ground and become meteorites, and maintain a high relative velocity of motion before colliding with the ground. High-energy meteorites collide with the ground to form considerable craters. Since the 1950s, a lot of research has been done on the mechanical problems of meteorites or meteoroid collisions. In order to ensure the safe flight of artificial satellites and space vehicles, it is necessary to study the collision problem between micrometeoroids and aircraft shells, and adopt corresponding protective structures. However, these studies on the killing effect and energy system of natural meteorites and comets can be more and more applied to the collision research of high-speed kinetic energy weapons, such as anti-missile KKV high-speed collision warheads. , high-speed armor-piercing projectiles and the killing effect of this higher-speed electromagnetic gun shells.
The collision speed of KKV warheads with high altitude anti-missile can reach more than ten Mach, and the collision speed of electromagnetic guns is gradually approaching Mach 10, so that the high-speed collision power of such warheads can reach tens of kilograms of warheads, several tons or even dozens. The explosive power of tons of TNT explosives is enough to easily destroy a 10,000-ton ship or a ground-buried work of thousands of square meters on the ground. Therefore, the shell of a high-speed electromagnetic gun has been called an artificial meteor! Once one falls on the head, it works very well. If a ship or a future chariot can continuously launch hundreds of such artificial meteors while moving, it is really a god can not stop!