Material characteristics:
The molecular formula of Alumina is Al2O3, which has the advantages of high hardness, moderate density, and strong bulletproof ability. It is also called corundum, hexagonal close-packed crystals, Mohs score hardness is 9.0, and relative density is about 3.88.
From the current point of view, the general development trend of armor materials is toughness, light weight, multi-function and high efficiency. Alumina ceramic material is an important part of bulletproof materials. It has high hardness and wear resistance, high compressive strength and excellent ballistic performance under high stress, and the manufacturing cost is relatively low, and the application field is more popular.
Bulletproof mechanism:
The bulletproof mechanisms of alumina ceramics and metals are very different. Metals absorb the kinetic energy of projectiles due to plastic deformation, while ceramics absorb the kinetic energy of projectiles due to their rupture. Under the impact of the bullet, the front of the alumina ceramic is broken and the remaining energy is absorbed by the soft reinforcement material of the back plate (usually PE laminate). The back plate material must be able to support the fragments of the ceramic material after the bullet impact and the bullet itself. .
The greater the ceramic hardness (that is, the ability to resist penetration by external forces), the smaller the depression depth of the back plate (PE). When the projectile interacts with the ceramic, the end of the projectile deforms to generate a compression shock wave. The compression shock wave is transmitted to the projectile and the ceramic surface and then reflected back to form a free elastic wave along the impact direction. The front end of the wave generates a huge stress whose value exceeds The ultimate stress of the projectile and ceramics causes the warhead to be damaged and subsequently cracked, and the ceramics appear to be cracked. The crack of the ceramic is centered on the impact, and it develops rapidly to the surroundings. At the same time, the hoop stress is generated due to the impact of the shock wave. The stress is transmitted to the surroundings with the impact point as the center and can limit the further expansion of the crack, which in turn makes the ceramic completely fragment and absorb more energy. Bulletproof ceramics consume energy due to wear and plowing during the penetration process, so that the residual penetration stress on the PE backplane is smaller.
Structure process:
The bullet-proof insert includes a front surface (alumina ceramic), a back plate (ultra-high molecular weight polyethylene fiber laminate), and an interface (adhesive composite anti-cracking layer). The structure conforms to the energy absorption mechanism of ceramic armor.
Single-curved/multi-curved design fits ergonomics, and the four corners are smooth. The two gradually shrinking upper corners are more suitable for the human body shape, which facilitates the removal and installation of the plug-in board, and ensures greater movement during tactical actions. Amplitude. When a soldier or police officer encounters a threat of high-powered bullets, they can be quickly inserted into the front side of the soft body armor, which can strengthen the bulletproof protection of the vital organs of the wearer's torso.
Standardized size: 250mm×300mm, large size 260mm×325mm, stable size, can protect the core part of the body, different sizes can be customized.
Selected waterproof surface cloth or polyurea spray paint process, surface protective paint layer: special brown-green polyurea protective paint, spray paint with uniform thickness, smooth surface, no cracks or damage.
Wear resistance, aging resistance, corrosion resistance, waterproof, anti-fouling, and improve the service life of the board
Defensive rifle bullet: 7.62×51mm M80 full metal armor (FMJ) NATO standard bullet (NATO)/5.56×45mm SS109/7.62×39mm AK47 soft steel core bullet (MSC)
Defense armor-piercing projectile: 15m range protection. 30 06 M2 AP armor-piercing projectile (7.62×63mm, projectile speed 878±10m/s)/7.62×54R speed-adjustable armor-piercing incendiary projectile
Bulletproof features: It has strong impact resistance and energy absorption capacity of bullets and fragments, effectively prevents penetration, has good blunt injury resistance, can resist bursts, ricochet (to prevent accidental damage to companions), and reduce non-penetrating damage.
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