Anti-Trauma Pads based on Non-Newtonian Materials for Flexible Bulletproof Inserts

Abstract

The aim of research was to develop a new kind of flexible anti-trauma pads (including non- Newtonian materials) for the lightweight bulletproof vests which could decrease the behind armour blunt trauma (BABT) more effectively than present solutions. In the study shear thickening fluid (STF) based on silica nanoparticles dispersed in liquid polypropylene glycol and silicone elastomer based on homogeneous methyl-phenyl-borosiloxane polymer composition were tested for their energy dissipation capability. Different variants of the anti- trauma pads with non-Newtonian materials were designed and investigated: high performance polyurethane foams filled with STF and foams produced with addition of STF. The anti-trauma pads in samples were placed between the aramid or ultra-high molecular weight polyethylene layers. For comparison there were also investigated analogical samples with the commercial anti-trauma pads. The scope of research included ballistic tests (the .44 Magnum SJHP bullet) of armour samples fixed to a box with a clay backing material.