Ballistic performance of Kevlar fiber UD sheets composite materials

In order to investigate the bulletproof property of Kevlar fiber unidirectional (UD) sheet composite, the Kevlar fiber UD sheet composite was prepared by wet winding technology and hot pressing process using water-based acrylic acid/water-based polyurethane as matrix. The effects of blending resin ratio, resin content, hot pressing process and other factors on the bulletproof performance of Kevlar fiber UD sheet composite were investigated, the bulletproof mechanism of the material was revealed, and the structure of the target plate was optimized. The results show that the bulletproof property of Kevlar fiber UD sheet composite increases first and then decreases with the increase of the specific gravity of water-based acrylic acid resin in the blend resin. When the mass ratio of water-based polyurethane to water-based acrylic acid is 1:2, the bulletproof property is better. With the increase of resin content, the bulletproof property of Kevlar fiber UD sheet composite material increases first and then decreases. When the resin content is 19wt%, the bulletproof property is better. The bulletproof performance of Kevlar fiber UD sheet composite increases first and then decreases with the increase of hot pressing pressure, hot pressing temperature and hot pressing time. The bulletproof mechanism of Kevlar fiber UD sheet composite material is mainly divided into three stages, the first stage mainly absorbs energy in the way of fiber shear damage, the second stage mainly absorbs energy in the way of fiber tensile fracture, and the third stage mainly absorbs energy in the way of fiber tensile deformation. The Kevlar fiber UD sheet composite with 8UD/4UD/8UD structure has better bulletproof performance.