Study on the enhancement mechanism of ballistic properties of shear thickening fluid impregnated aramid fabric composite plates

Abstract

This study proposes a process for the preparation of composite laminates using the shear thickening fluid (STF) impregnated aramid fabric and presents some fabric panel configuration strategies. Firstly, this study prepared two kinds of STF using 20 nm and 500 nm silica particles. Then, the STF-impregnated Kevlar fabrics were laminated and hot-pressed to form the fabric panels. After that, the ballistic performance of the fabric panels was evaluated by firing the 9 mm steel core projectile using a gas gun. The ballistic tests showed that the ballistic performance of the hybridized configuration panels using STF-20 treated fabrics as the front panels and STF-500 treated fabrics as the backing panels was superior, with a reduction of 36.1%–37.6% in the number of perforated layers (4.7–5 layers) compared to a single STF-treated panel. This study provides a new idea and method for applying STF in protective equipment. Highlights: Shear thickening fluid (STF) and aramid fabric are better combined by hot pressing lamination process; The ballistic properties of fabric panels are significantly improved by hybrid configuration; The ballistic performance enhancement mechanism of composite bulletproof plate was revealed.