Tensile behavior of electrorheological fluids under direct current electric fields

摘要

Tensile behavior of electrorheological (ER) fluids based on zeolite and silicone oil under different applied dc voltages has been experimentally investigated. Five types of tensile behavior have been observed and described. The different behaviors were reasonably explained by the structural evolution of particle chains and the decreasing field effect during their elongation. The experimental results also revealed that the tensile yield strength was proportional to the electric field to the power of 1.58 for voltages ranging between 0.2 and 1.0 kV, 2.11 for voltages between 1.0 and 2.5 kV, and 1.17 at voltages between 2.5 and 3.5 kV. The exponent of 2.11 is higher than the square relationship predicted by traditional polarization models. At higher voltages, the limitation of the interaction between the ER fluids and the electrodes caused the exponent to decrease. Also, the tensile behavior of ER fluids was compared with the elongation of metal bars that determined the tensile strength of metal materials, to assist in understanding the structural strengthening effect and other behaviors of ER fluids under elongation. Finally, current density was also simultaneously tested to verify the structure evolution during elongation.