Investigation of high velocity impact on shear thickened fluid woven composite

Journal of Mechanical Research and Application

دوره 10، شماره 1، مرداد 2020، صفحه 47-56   

نویسندگان

mohammad bagher mansouri^{* 1}؛ Mehdi Yarmohammad Tooski²

¹department of mechanical engineering, islamic azad university of south tehran branch, tehran, iran

²South Tehran branch, Islamic azad University

چکیده

The protective vest is an important accessory to absorb impact energy and stop bullets from penetrating the body. Many modern vests are made by polymer matrix composites reinforced with kevlar, glass, and carbon fibers. The presence of water increases the friction between the bullets and the fibers and, as a result, increased the yield of the fabric. The shear thickening fluid (STF) is composed of silica particles dissolved in the liquid phase (e.g., polyethylene glycol). Silica particles are about a few nanometers in diameter. In equilibrium, the liquid phase is filled with colloidal hard particles. At high shear rates, hydrodynamic forces overcome intrusive repulsive forces. So after collision, the colloid particles of the material harden. In this study, experimental and numerical studies of impact on two and four layers of KFLF dipped with STF liquid with different percentages of nanosilica percent were investigated. Numerical modeling was performed with AutoDyn software. By comparing numerical simulation and experimental, good agreement between results of the ballistic limit is obtained.

کلیدواژه‌ها

Kavlar yarn؛ shear thickening fluid؛ impact؛ ballistic limit