Strain dependence of dynamic viscoelastic properties and yield behavior for electro-rheological suspension with cation exchange resin particles

The strain dependence of dynamic viscoelastic properties was measured for an electro-rheological (ER) suspension with cation exchange resin particles. The relation between the fundamental component of stress amplitude and the strain amplitude which could be applied to the ER suspension was calculated using the amplitude of the fundamental component of torque response (T1), and the storage modulus (G1') and loss tangent (tan delta 1) obtained by Markovitz method. The ER suspension showed a yield process with three steps under various electric field strengths. The measured three yield strains were almost independent of the electric field strength. The yield behavior of the ER suspension was discussed based on an induced dipole-dipole interaction model.