Yield stress analysis of electrorheological suspensions containing core–shell structured anisotropic poly(methyl methacrylate) microparticles

Abstract

An electrorheological (ER) model (Seo‐Seo model) was applied to the yield stress analysis of the electrorheological fluids containing core–shell structured, snowman‐like anisotropic poly(methyl methacrylate) micro particles. The model predictions were compared with the experimental data, to reveal a good agreement with the shear stress behavior, both quantitatively and qualitatively. The obtained static yield stress was compared with the dynamic yield stress calculated by the CCJ model. The analysis results indicated that static yield stress was higher than the dynamic yield stress. The master curve describing the apparent viscosity was obtained by appropriate scaling of both axes showing that a combination of dimensional analysis and flow curve analysis using the Seo‐Seo model yielded a precise description of an ER fluid's rheological behavior. Copyright © 2014 John Wiley & Sons, Ltd.