Study of Impact Resistance of Composites Containing Shear Thickening Fluid
| Autor: | Jhih-Jhang Lin, 林志璋 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 In this study, shear thickening fluid was prepared by two methods. Polyethylene glycol was used as the fluid and silicon dioxide nanoparticles of two different sizes were used as the colloid. From the results, we observed that the mixtures of high loading level of silica nanoparticles with polyethylene glycol demonstrated significant shear thickening behavior. For the PEG fluid containing 40 wt% 15 nm silicon dioxide nanoparticles, the viscosity of fluid instantly increased 29 to 30 times when shear rate increased from 5/s to 28.9/s. Also, for the PEG fluid containing 72.93 wt%, 450 nm silicon dioxide nanoparticles, the viscosity of fluid instantly increased 7 to 9 times when shear rate increased from 61.1/s to 217/s. One of the applications of STF is protection. Impregnating Kevlar fabrics with shear thickening fluid into Kevlar fabric may significantly reduce the layers of Kevlar fabric needed for ballistic impact resistance and improve the flexibility of the composite. In this study, ballistic testing samples were prepared from neat Kevlar fabrics and STF-impregnated ones using Kevlar fabrics with various amount of shear thickening fluid. The result shows that samples reinforced with STF showed a significant improvement in bullet energy absorption. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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