Abstract
Transient shear stress responses of an electrorheological fluid to step-wise electric fields are investigated experimentally. The characteristic time constants of the electrorheological fluid sheared between two concentric cylinders are obtained under various electric field strengths and shear rates. Especially, two experimental modes are adopted to investigate the effect of the cluster formation on the dynamic response of the fluid; one is that the electric field is induced before shearing, and the other is the electric field is induced after shearing. The cluster formation time is obtained from the difference in the response times between the two modes. The cluster formation time is monotonously increased with the increase of shear rate and converged on a constant value.
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