Low-Velocity Impact Response of Auxetic Seamless Knits Combined with Non-Newtonian Fluids

Abstract

Low-velocity impact can cause serious damage to the person or structure that is hit. The development of barriers that can absorb the energy of the impact and, therefore, protect the other side of the impact is the ideal solution for the pointed situation. Auxetic materials and shear thickening fluids are two types of technologies that have great capabilities to absorb high levels of energy when an impact happens. Accordingly, within this study, the combination of auxetic knits with shear thickening fluids by the pad-dry-cure process was investigated. It was observed that, by applying knits with auxetic patterns produced with denser materials and combined with the shear thickening fluids, high performance in terms of absorbed energy from puncture impact is obtained. The increment rates obtained are higher than 100% when comparing the structures with and without shear thickening fluids.

Fabric Impregnation with Shear Thickening Fluid for Ballistic Armor Polymer Composites: An Updated Overview

“…The use of the STF-impregnation method has interestingly enhanced the energy absorption when compared with neat fabric, associated with the increase in weight fraction of silica nanoparticles. The same occurred with Pais et al [ 214 ], adopting polyamide and elastane as raw materials for the fabric. Thus, according to the results reached and the low number of publications, the STF-impregnated auxetic fabric presents promising potential for future works and ballistic applications.…”

“…Recently, two works about STF-impregnation auxetic fabrics also presented remarkable performance under low-velocity impact tests [ 213 , 214 ]. Auxetic materials are those with a negative Poisson ratio.…”

Unexpected Method of High-Viscosity Shear Thickening Fluids Based on Polypropylene Glycols Development via Thermal Treatment

“…The most common application of STFs is their usage in armor protection. STFs are used to impregnate aramid fabrics to improve the protection of soft body armor [ 1 , 2 , 3 , 4 ]. Starch-based STFs show shear thickening properties suitable for soft body armor [ 5 ].…”

Advances in Textile Structural Composites

“…Evidently, the increasing interest in these materials has generated a high demand for the proper characterization of the methods, accurate FE simulations, suitable nondestructive testing techniques, and adequate visualization techniques. The structured nature of textile-reinforced composites, as described by their geometrical pattern, allows for a new type of analysis, namely one that takes into account their topology [ 10 ]. The Special Issue details the various applications of advanced textile structural composites into collective groups.…”