Mechanical Properties and friction force in para-aramid fabrics impregnated with shear thickening fluids

Shear thickening feature is a property that appears to increase the viscosity under increased shear stress, which places fluids with this behavior in non-Newtonian fluid categories. This property only occurs in high concentration suspensions causing aggregation mechanism based on friction between particles under effect of stress and tension, resulting in a sharp increase in viscosity. High impact resistance and energy absorption capacity of these fluids tend to be used in energy dampers. Shear thickening fluid using polyethylene glycol as the continuous medium and nano sized silica particle in sizes of 40nm and in different weight percentage were used. Mechanical performance of para-aramid fabric impregnated STF were assessed against neat fabric. Results show friction force between fibers and tensile strength increased in impregnated fabrics compare with neat fabrics. So, in the STF pre-impregnated fabrics friction played major role in energy absorbing mechanism

کلیدواژه ها:

Shear thickening ، Energy absorption ، Silica particle ، Para-aramid ، Mechanical properties