The Rayleigh identity, based on a multipole expansion, theory is extended to investigate the mechanical properties of an ideal electrorheological fluid which consists of metal particles with insulating outer layer in a dielectric oil. The evaluation of the effective dielectric constant is emphasized. The dependence of the shear stress tau on the shear strain theta and the shear modulus G for chains of particles arranged on a square lattice is discussed. (C) 1998 Elsevier Science Ltd. All rights reserved.
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