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![Kevlar woven fibers and shear thickening fluid for body armor[24].](profile/Nabeel-Al-Mutairi/publication/360822841/figure/fig2/AS:1159273262391303@1653403692996/Kevlar-woven-fibers-and-shear-thickening-fluid-for-body-armor24.jpg)
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![Figure 1: Types of fluids[5]. At low shear rates, shear thinning...](profile/Nabeel-Al-Mutairi/publication/360822841/figure/fig1/AS:1159273262391302@1653403692974/Types-of-fluids5-At-low-shear-rates-shear-thinning-behavior-appears-and-with_Q320.jpg)
Shear thickening fluids STFs are a new kind of materials that consist of nano/micro particles that dispersed in another material such as polymer. In this review paper, the definition of this type of materials and the mechanism of its work are explained. In addition, the main factors that can effect on this behavior and their applications in differe...
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... Therefore, this STF property has been applied to reinforce fabrics to improve their resistance to impact loading. 11 In STF, media-particle and particle-particle interaction plays the main role in determining the formation and development of shear-thickening. 12,13 Changing structures after the critical shear rate is mainly induced by hydrodynamic force, which shifts the force equivalence between all the system' constituents by altering particle-particle and media-particle interaction forces. ...
The present study deals with the chemical modification of polyethylene glycol (PEG) based on shear thickening fluids (STFs) and their application to improve the ballistic impact and quasi-static resistance performance of 3D E-glass fabrics. The carrier fluid (PEG 200) was modified with two different agents, oxalic acid and glutaric acid. The modified PEGs were then characterized by FTIR analysis. The rheological analysis of modified STF using glutaric (G/STF) and oxalic acid (O/STF) showed an improvement in peak viscosity by 10.33 and 3.28 times compared to pure STF (P/STF), respectively. Moreover, PEG modification resulted in higher chain length and a higher number of hydrophilic functional groups, representing superior media-particle interaction through abundant H-bonding. As a result of improved viscosity, the ballistic resistance and quasi-static performance of modified STF-treated fabrics were enhanced compared to that of P/STF-treated fabrics. A two-step artificial intelligence regression analysis was performed to predict quasi-static puncture resistance at different puncture speeds. The results showed a strong correlation between the load-deformation behavior and the loading speed.
