Rheological characteristics analysis of shear thickening fluids based on response surface methodology

Abstract This paper analyzed the influence of various components and external environment on rheological properties shear thickening fluid (STF). The single-factor experimental study was carried out with silica particle size, mass fraction particles, continuous phase’s average molecular weight, temperature as influencing factors. Obtain factors initial viscosity, critical rate, period ratio STF samples. According to crossover relationship between stress intermolecular force when occurs, STF’s rate criterion is constructed. By introducing mechanical balance small molecules, particles’ volume distance particles in suspension system established. formulas capacity are deduced, which supports conclusions obtained experiment. Based experiment conclusion, weight phase used factors, maximum viscosity responses indicators. Box-Behnken response surface methodology (RSM) design, 15 analysis experiments three levels out. characteristics regression equation each factor, based three-dimensional graph F-value ANOVA result. We found that among interaction effects, has most significant impact STF. significantly impacts Finally, according results ideal standard engineering applications, 35%, 387, 20 °C. 5.84 1/s, 102.8, peak 1191.7 Pa·s, reaching optimal theoretical value within scope.