Rheological behavior of electrorheological fluid (ERF) under electric field is investigated experimentally and structural strengthening and viscoplastic characteristics are evaluated at different intensities of electric field and various concentrations of solid phase in ERF under its deformation in the system of disk parallel surfaces. An increase of the first difference of normal stresses is found at the increase of intensity of electric field applied, and also its change in time. At that the change of the sign of normal stresses takes place depending on magnitude of electric field and deformation.

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