Abstract
It is known that shear thickening fluids increase the energy absorption capacity of high performance fabrics. For this reason, soft body armors were produced by impregnating shear thickening fluids recently on high performance fabrics. In this study, it is aimed that examine the effects of shear thickening fluid and fabric structure on the inter-yarn friction properties of para-aramid fabrics with different properties. Fumed silica was dispersed in polyethylene glycol to produce shear thickening fluid. Twaron 200 and Twaron 460 para-aramid fabrics with different properties such as threads number (105x105 and 67x67), areal density (200 gr / m2 and 460 gr / m2) and linear density (930 and 3360 Dtex) were impregnated with shear thickening fluid. It was observed that both of shear thickening fluid impregnated fabrics had higher yarn pull-out force than neat fabrics due to inter-yarn friction. When shear thickening fluid impregnated fabrics were compared to maximum yarn pull-out force; Twaron 200 and Twaron 460 fabrics requires approximately 3 times and 9 times more force to pull-out the yarn in comparison to the neat fabric respectively. In this study, it has been observed that the positive effects of shear thickening fluid impregnation on energy absorption of Twaron fabrics depend on structural parameters such as threads number, areal density and linear density.
Highlights
Shear thickening fluids are a non-Newtonian fluid type obtained by homogeneous mixing of nanosized solid particles in a liquid medium
Yarn pull-out tests were carried out by impregnating STF on two different Twaron para-aramid fabrics. It has been investigated whether the positive effects of STFs on the energy absorption of Twaron fabrics are dependent on structural parameters such as threads number, areal density and linear density
Fumed silica was dispersed in polyethylene glycol to produce shear thickening fluid
Summary
Shear thickening fluids are a non-Newtonian fluid type obtained by homogeneous mixing of nanosized solid particles in a liquid medium. STF has been reported to effectively reduce yarn mobility and accelerate the transverse response of the UHMWPE fabric and increase the inter-yarn friction, making the impactor point pushing the yarns to the edge and making it difficult to penetrate the fabric [18] The reasons for this energy absorption effect obtained by impregnating STF with high performance fabrics were investigated. Gürgen and Kuşhan produced single and multi-solid phase STFs in their study They reported that STF impregnated Twaron fabrics were more successful in ballistic and dynamic impact tests than neat fabrics. Yarn pull-out tests were carried out by impregnating STF on two different Twaron para-aramid fabrics It has been investigated whether the positive effects of STFs on the energy absorption of Twaron fabrics are dependent on structural parameters such as threads number, areal density and linear density
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