Determination of Energy Absorption Capabilities of Shear Thickening Fluid Impregnated Aramid Fiber Fabrics for Ballistic Applications
Abstract
The low-velocity impact behavior of shear thickening fluid (STF) impregnated
aramid fabric having different numbers of layers was investigated throughout this
study to determine a relationship between the number of layers and perforation
energy. Firstly, STF solutions, including polyethylene glycol, silica nanoparticles,
and ethanol, were prepared by mixing with a homogenizer. Solutions containing 5%,
10%, and 20% silica nanoparticles by weight were prepared, and rheological analysis
was performed. 20% weight fraction solution showed the optimum thickening
behavior among the three solutions. After thickening behavior and the critical shear
rate were determined from rheological analysis, the solution was impregnated into
the aramid fabric. Then, specimens with different numbers of layers, from 1 to 8,
were prepared for low-velocity impact experiments. A drop-weight impact test was
applied at different energy levels from 20 J to 240 J, and perforation energy was
determined. Finally, an equation that has a form of power function was fitted to use
it for potential energy absorption applications such as ballistic impact.
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