Saturday, May 6, 2017

Tell you why ceramic pieces can be used to make Bulletproof Vest

Bulletproof material must consider three characteristics:
First , high hardness , followed by compressive strength , and then the bulk density . Hardness : high hardness of ceramic materials , fragile , effectively absorb the impact on bullet's . Compressive strength : to provide greater resistance to high-speed bullet's , effectively reduce the bullet speed . Bulk density : bulletproof material must be lightweight , the same weight Bulletproof Vest , small bulk density can be equipped with thicker bulletproof material , so that better anti-ballistic effect of equipment . In recent years , ceramic materials in the field of bullet-proof applications become more maturer , has spread from the special military equipment to the daily police equipment (including a variety of security areas ) . More common bulletproof ceramic materials are three (alumina , silicon carbide , boron carbide ) costs doubled .  

Ceramic does body armor is not possible, 1 Product feasibility is certainly feasible . Bulletproof Vest is mainly for the warhead or shrapnel , these two things have two kinds of people hurt : through the body warhead or shrapnel are sharp , In the high-speed movement has a strong kinetic energy , directly through the human body or drill into the meat in formation of injury . To combat the formation of internal injuries Sometimes , although the warhead or shrapnel as a result of blocking the body did not drill into the body , but the high-speed movement to bring a powerful kinetic energy , real body is absorbed , the popular point is the warhead or shrapnel first hit a certain part of the body , this part After the impact force , the force is then passed to the subsequent organ , and then passed to the other organs inside the body (of course , the direction of the ballistic path ) . The body of the organ is equivalent to a high-precision instruments , by this brute force , will naturally be damaged , the formation of internal injuries

Therefore , the bulletproof layer of the body armor needs to play two roles : to prevent the warhead or shrapnel drill , to resolve the impact of the body when the force to prevent the warhead or shrapnel drill , You need high hardness , so that it does not move ; Strength , strong enough to withstand the impact . To destroy the power of the impact on the human body , You need to " soft grams just " , so that " mud cattle into the sea " , play no role , Helpless . The In physics or materials , It is called " energy absorption " . The bulletproof layer of the ceramic body armor is certainly a composite material , the outer layer is a ceramic tile , the bullet or shrapnel is slug , and the inner layer is used as a buffer layer with a high elasticity and strong enough.

The feasibility of industrialization Ceramic as a bulletproof layer is the ideal material, but there are "brittle" birth defects, once the warhead or shrapnel impact strength is higher than the ceramic sheet can withstand the limit, it will not happen as metal Deformation can be, but directly broken, like a "destroy switch" the same. So the life of the body armor depends on Shashi Hou encountered high impact force of the bullet. People who use body armor certainly hope that body armor can be used repeatedly, ceramic materials at this point, really less than metal, nylon, Kevlar and other high toughness of the material. In short, the ceramic body armor is the ideal body armor, high safety factor, but life is not Kaopu, for the strength of the following limit of the bullet, just shot, but once hit a high strength, flew bad, at least by Damage to the impact area. If the ceramic plate can be replaced, which piece of bad for which piece, it would be no problem. 

So the ceramic does body armor is not because of his strength or strength than the problem . Because the strength of the ceramic itself is not high , especially the tensile and bending strength . Even if the ceramic light , there is no need to sacrifice the main parameters so much in exchange for light . Ceramic does  bullet-proof clothing should be mainly because of the hardness of ceramics , such as SiC . High hardness , high modulus can make it in the impact of the bullet when the deformation does not occur inward , so that bullet's can not penetrate the body armor , which play a protective role . If the hardness is low , low modulus , deformation under the impact of the bullet , even if the bullet does not penetrate will hurt people . This is why the parameters of the body armor should not be the main strength , high strength material modulus may be very low , in other words the deformation rate is very large , the deformation rate reaches a certain degree will occur bullet's with body armor to hit the body Happening







 


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