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    Effects of molecular weight of polyethylene glycol with size and ratio of fumed silica on rheological behavior of shear thickening fluid
    (Elsevier Ltd, 2024) Yanen, Cenk; Solmaz, Murat Yavuz; Aydoğ, Ercan; Arslanoğlu, Hasan
    The rheological models of shear thickening fluids (STFs), which have recently been used in many fields, are estimated using a statistical method in this study. Although research has been carried out to predict the rheological properties of STFs, the variation of the basic parameters affecting the rheological properties has not been studied much in these estimations. To produce shear thickening fluids, silica nanoparticles have been dispersed in polyethylene glycol (PEG). To make the rheological model estimation correctly, nanoparticle ratios (10 wt%, 15 wt%, 20 wt%, 25 wt%), the particle sizes (9 nm, 12 nm, and 14 nm), and the molecular weight of the liquid mediums are produced by changing three different sample set is used. At high shear rates, mixtures of fumed silica (aerosil) and PEG display shear thickening behavior. In the low shear rates (0-200 s-1), this mixture exhibits shear thinning property, while in the high shear rates (200-1000 s-1), shear thickening behavior. Fumed silica-PEG suspensions show pseudoplastic behavior in the first region and dilatant properties in the second region. Equations from theory are used to model the outcomes of the experimental data. Non-Newtonian models are used, and the best model is chosen based on the rheological behavior of the mixes. Herschel-Bulkley is discovered to be the most suitable non-Newtonian model in the first and second regions.
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    Investigation of rheological behavior of produced HSTF and evaluation of energy dissipation performance by application to Twaron fabric
    (Springer Science and Business Media Deutschland GmbH, 2023) Yanen, Cenk; Solmaz, Murat Yavuz; Aydoğmuş, Ercan; Arslanoğlu, Hasan
    In this research, the rheological behavior of shear thickening fluid (STF), produced using many nanoparticles, has been investigated. Fumed silica, multi-walled carbon nanotube (MWCNT), graphene nanoplate (GFNP), and silicon carbide (SiC) nanoparticles have been used in the production of the hybrid sample. In the rheological test results, it has been preferred because it is successful in the production of hybrid shear thickening fluid (HSTF), 25 wt.% by the mixture of Aerosil 150, and polyethylene glycol 400 (PEG 400). Different particle sizes of each nanoparticle have been determined by adding MWCNT, GFNP, and SiC nanoparticles to HSTF. In the production of HSTF, the highest performance is found in MWCNT (0.3 wt.%), SiC (0.2 wt.%), and GFNP (0.1 wt.%) when each nanoparticle is used as a single, double, or triple. The stab resistance of Twaron fabrics is also investigated in a drop tower against spike and knife impactors. It is understood that HSTF-impregnated Twaron fabrics have a positive effect on energy absorption performance. The energy absorption performance of HSTF-impregnated Twaron fabrics is found to be more effective than STF-impregnated Twaron fabrics.