the UD structure was chosen as the fabric reinforcement structure. The sheet target was prepared by stacking Kevlar fiber
In order to explore the ballistic performance of Kevlar fiber unidirectional (UD) composite materials, water-based acrylic resin/water-based polyurethane was used as the matrix, and Kevlar fiber UD composite materials were prepared using wet winding technology and hot pressing process. The influence of factors such as resin blending ratio, resin content, and hot pressing process on the ballistic performance of Kevlar fiber UD composite materials was investigated, the ballistic mechanism of the materials was revealed, and the structure of the target plate was optimized. The results show that with the increase of the proportion of water-based acrylic resin in the blend resin, the ballistic performance of Kevlar fiber UD composite materials first increases and then decreases. When the ratio of water-based polyurethane to water-based acrylic resin is 1:2, the ballistic performance is better. With the increase of resin content, the ballistic performance of Kevlar fiber UD composite materials first increases and then decreases. When the resin content is 19wt%, the ballistic performance is better. The ballistic performance of Kevlar fiber UD composite materials increases first and then decreases with the increase of hot pressing pressure, hot pressing temperature, and hot pressing time. The ballistic mechanism of Kevlar fiber UD composite materials can be divided into three stages: the first stage mainly absorbs energy in the way of fiber shear failure, 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 ballistic performance of the 8UD/4UD/8UD structure of Kevlar fiber UD composite materials is better.
In this study, Kevlar fiber was chosen as the reinforcing fiber, water-based polyurethane/water-based acrylic resin blend resin was chosen as the matrix, and the UD structure was chosen as the fabric reinforcement structure. The sheet target was prepared by stacking, which is softer and has better wearing comfort than laminated plates. The influence of factors such as resin blending ratio, resin content, and hot pressing process on its ballistic performance was investigated, the ballistic mechanism was revealed, and the structure was optimized, providing a reference for further optimization and design of flexible bulletproof clothing.