The Organizational Structure of Bulletproof Cloth

In addition to fiber properties and yarn characteristics, the organizational structure of the fabric is also an important factor affecting the bulletproof ability of bulletproof clothing. The types of fabric structures used on software bulletproof vests include knitted fabrics, woven fabrics, weft less fabrics, needle punched non-woven felt, etc. Knitted fabrics have a high elongation rate, which

The Organizational Structure of Bulletproof Cloth

In addition to fiber properties and yarn characteristics, the organizational structure of the fabric is also an important factor affecting the bulletproof ability of bulletproof clothing. The types of fabric structures used on software bulletproof vests include knitted fabrics, woven fabrics, weft less fabrics, needle punched non-woven felt, etc. Knitted fabrics have a high elongation rate, which is beneficial for improving wearing comfort. But this high elongation used for impact resistance will result in significant penetrating damage. In addition, due to the anisotropic nature of knitted fabrics, they have varying degrees of impact resistance in different directions.

So, although knitted fabrics have advantages in production cost and efficiency, they are generally only suitable for manufacturing stab proof gloves, fencing suits, etc., and cannot be completely used on bulletproof vests. At present, the most widely used bulletproof materials in bulletproof vests are woven fabrics, non-woven fabrics, and needle punched nonwoven felt. Due to their different structures, these three types of fabrics have different bulletproof mechanisms, and currently, ballistics cannot provide sufficient explanations. Generally speaking, after a bullet hits a fabric, it will generate a radial vibration wave in the impact area and spread rapidly through the yarn.

When the vibration wave reaches the interweaving point of the yarn, a portion of the wave will propagate along the original yarn to the other side of the interweaving point, another portion will transfer to the interior of the interweaving yarn, and another portion will reflect back along the original yarn, forming a reflected wave. Among the three types of fabrics mentioned above, woven fabrics have multiple interweaving points. After being hit by bullets, the kinetic energy of bullets can be transmitted through the interaction of yarns on the interweaving points, allowing the impact force of bullets or shrapnel to be absorbed in a larger area.

But at the same time, the interweaving points play a fixed role invisibly. The reflected wave formed at the fixed end and the original incident wave will generate a co directional Sanga, greatly enhancing the tensile force on the yarn and causing it to fracture after exceeding its fracture strength.

In addition, some small shrapnel may push apart a single yarn in the woven fabric, thereby reducing the penetration resistance of the shrapnel. Within a certain range, increasing the density of the fabric can reduce the possibility of the above situation and increase the strength of the woven fabric, but it will enhance the negative effect of stress wave reflection. In theory, to achieve good impact resistance, unidirectional materials without interlacing points should be used.