Bulletproof vest is mainly composed of jacket and bulletproof layer.The clothing cover is usually made of chemical fiber fabric to cover and protect the bulletproof layer. The bulletproof layer is made of metal (special steel, aluminum alloy, titanium alloy), ceramic sheet, glass fiber reinforced plastic, nylon (PA), Kevlar, Doyen Tron ex fiber, liquid protection materials and other materials to form a single or composite protective structure.The bullet proof layer can absorb the kinetic energy of the warhead or fragment, and has obvious protective effect on the low-speed warhead or fragment, and can reduce the damage to human chest and abdomen under the condition of controlling certain depression.In terms of use, bulletproof vests can be divided into police type and military type.In terms of materials, bulletproof vests can be divided into software, hardware and soft hard complex.The material of soft bulletproof vest is mainly composed of high-performance textile fiber composite material without weft cloth. These high-performance fibers are far higher than the energy absorption capacity of general materials, which endow the bulletproof vest with bulletproof function. Moreover, since this kind of bulletproof vest generally adopts the structure of textile, it has considerable softness, so it is called soft bulletproof vest.Hard body bulletproof vests are mainly made of metal materials such as special steel plate, super aluminum alloy or hard non-metallic materials such as alumina and silicon carbide. The bulletproof vests made from these materials generally have no flexibility and are mainly in the form of plug-in boards.The softness of the soft and hard composite bulletproof vest is between the above two types. It is a kind of composite bulletproof vest with soft material as lining and hard material as panel and reinforcement material.At present, Kavlar fiber is recognized as a good material for making bullet proof vests. A common bulletproof vest is generally composed of dozens of Kevlar fibers and ceramic plates, and its toughness is more than five times that of steel.
From the single function of covering the bullet proof layer in the past, the clothing cover has developed to the high-performance bullet proof jacket with the functions of fire prevention, waterproof and camouflage.The thickness of bulletproof layer of bulletproof vest is determined by the balance number between protective performance and wearing comfort according to different objects.The structure of the bulletproof layer is either single or composite.There are many kinds of bulletproof materials, as well as bulletproof materials and shock absorption materials.Some of them are made of sheet materials, and some are made of one piece of bulletproof material.At present, the rigid materials are generally made into flakes, and the mobility of the body is large, and the soft bulletproof materials are generally made of integrity.
