The composite material is usually made up of fibers that are mixed with another material called matrix or methodology. In order to strengthen it.
Examples of this are in the article used by the Pharaohs to make mummy covers. Like the last one we take from our modern era in East Germany, where they used a composite material to paint cars. Bakelite is an industrial resin reinforced by the addition of glass or carbon fibers. Sometimes, we find that some strengthen the cement by placing sheets of metal inside it. It is protected from degradation if exposed to high pressure while we find that in wood, a natural strengthening material, as engineers say, because of the cellulose fibers in it. Kevlar is the industrial name of the material discovered by Stephanie Kaulik in 1965. This material is mainly based on a series of man-made particles. This series is based on the strong bond between the rings of carbon atoms. The strength of these rings is about five times that of steel and has the non-expansion feature. Human .
The method of making these composite materials is very complex and incomprehensible to this day and the engineers still use them in the manufacture of many things but in a secret manner, the objectives of use vary according to the types of composite materials, whether cut or long, isolated or isolated rigid or to the horizontal or expandable has written The specialists have many huge books on these materials so what you will read now is a further illustration.
For all the material latent energy explained like on the tension in the water surface. If you watch an insect walk over the water you will see that its legs are making conical dots or holes on the surface of the water. These holes increase the surface area of course and float the insect because its potential energy (resulting from its weight) is perfectly balanced with increased surface water energy. Fluids tend to reduce their surface energy as much as possible. You can notice this when the total area of the droplet surface is less than the contents of the same amount of water in a high cylindrical column. In fact, the solids behave the same way . But finding more space in a rigid material requires an increase in energy.
Bullet:
The speed of the shock wave in any material usually reflects the speed of sound in this material, which will of course be much faster than the speed of the bullet. Thus, when the bullet strikes the surface of a static material, the shock waves will move outward on both sides faster than the bullet itself. This means that the protective material must have sufficient time to carry out its task. In the case of composite materials, the shock will be spread in a series of refractories within the matrix material, which tends to run parallel to the fiber surface with a shock away from the core of the composite material. In the case of Kevlar, the fibers are so inflexible that it takes enormous energy to achieve this. If the fibers are alternately or cross-linked, the shock will branch out and new surfaces will be found for subsequent shocks. All this happens in less than a tenth of a second but the energy absorbed by the material and which finds all these new surfaces within the fibers is perfectly capable of deterring a bullet from entering.
Why does steel not give us such protection?
Apart from the light weight of composite materials relative to steel, the type of protection provided by an iron shield may pose a danger to the human, even if not penetrated, because the method of transmission of shock waves inside may cause a scratch on the internal surface. Which is considered the seriousness of the bullet itself . There are some types of anti-tank missiles, specially designed to blow up tanks and destroy them, let alone a shield of the same material not exceeding the thickness of centimeters.
Finally, it should be noted that the use of composite materials is not limited to military matters, but goes beyond the basic material in the manufacture of (fiberglass) modern, which consists of boats and reservoirs and many types of furnishings.
Examples of this are in the article used by the Pharaohs to make mummy covers. Like the last one we take from our modern era in East Germany, where they used a composite material to paint cars. Bakelite is an industrial resin reinforced by the addition of glass or carbon fibers. Sometimes, we find that some strengthen the cement by placing sheets of metal inside it. It is protected from degradation if exposed to high pressure while we find that in wood, a natural strengthening material, as engineers say, because of the cellulose fibers in it. Kevlar is the industrial name of the material discovered by Stephanie Kaulik in 1965. This material is mainly based on a series of man-made particles. This series is based on the strong bond between the rings of carbon atoms. The strength of these rings is about five times that of steel and has the non-expansion feature. Human .
The method of making these composite materials is very complex and incomprehensible to this day and the engineers still use them in the manufacture of many things but in a secret manner, the objectives of use vary according to the types of composite materials, whether cut or long, isolated or isolated rigid or to the horizontal or expandable has written The specialists have many huge books on these materials so what you will read now is a further illustration.
For all the material latent energy explained like on the tension in the water surface. If you watch an insect walk over the water you will see that its legs are making conical dots or holes on the surface of the water. These holes increase the surface area of course and float the insect because its potential energy (resulting from its weight) is perfectly balanced with increased surface water energy. Fluids tend to reduce their surface energy as much as possible. You can notice this when the total area of the droplet surface is less than the contents of the same amount of water in a high cylindrical column. In fact, the solids behave the same way . But finding more space in a rigid material requires an increase in energy.
Bullet:
The speed of the shock wave in any material usually reflects the speed of sound in this material, which will of course be much faster than the speed of the bullet. Thus, when the bullet strikes the surface of a static material, the shock waves will move outward on both sides faster than the bullet itself. This means that the protective material must have sufficient time to carry out its task. In the case of composite materials, the shock will be spread in a series of refractories within the matrix material, which tends to run parallel to the fiber surface with a shock away from the core of the composite material. In the case of Kevlar, the fibers are so inflexible that it takes enormous energy to achieve this. If the fibers are alternately or cross-linked, the shock will branch out and new surfaces will be found for subsequent shocks. All this happens in less than a tenth of a second but the energy absorbed by the material and which finds all these new surfaces within the fibers is perfectly capable of deterring a bullet from entering.
Why does steel not give us such protection?
Apart from the light weight of composite materials relative to steel, the type of protection provided by an iron shield may pose a danger to the human, even if not penetrated, because the method of transmission of shock waves inside may cause a scratch on the internal surface. Which is considered the seriousness of the bullet itself . There are some types of anti-tank missiles, specially designed to blow up tanks and destroy them, let alone a shield of the same material not exceeding the thickness of centimeters.
Finally, it should be noted that the use of composite materials is not limited to military matters, but goes beyond the basic material in the manufacture of (fiberglass) modern, which consists of boats and reservoirs and many types of furnishings.