Abstract
This paper presents a study of the rheological properties of shear thickening fluid (STF)and its application as a damper. The STF samples, with different weight fractions,were prepared by dispersing nanosized silica particles in a solvent. By using aparallel-plate rheometer, both steady-state and dynamic experiments were carried out toinvestigate the rheological properties of STFs. Experimental results indicated thatthese suspensions show an abrupt increase in complex viscosity beyond a criticaldynamic shear rate, as well as this increase being reversible. Working with thefabricated STF materials, a prototype damper was fabricated and its dynamicperformances were experimentally evaluated. An equivalent linear model througheffective elastic stiffness and viscous damping was developed to address boththe damping and the stiffness capabilities of the damper. Also, a mathematicalmodel was developed to investigate working mechanisms of STF-based devices.
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