Influence of a surface film on the particles on the electrorheological response
- 1 January 1997
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 81 (1), 383-389
- https://doi.org/10.1063/1.364123
Abstract
A conduction model is developed for the dc electrorheological (ER) response of highly conducting particles (e.g., metal particles) suspended in a weakly conducting oil. The numerical analyses show that a surface film with some conductivity is desired, but not a completely insulating film as previously proposed. Increasing the film conductivity leads to an increase in the ER yield stress. However, too high a conductivity will give an unacceptable level of current density. The film should also have an intermediate thickness. A small thickness increases the possibility of electrical breakdown in the film; too large a thickness decreases the ER effect. Good agreement exists between the yield stress and the current density predicted by our model and those measured.Keywords
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