摘要
Under alternating current electric field, effective response of granular nonlinear composites with sphericalcoated inclusions is investigated in the dilute limit by using the perturbation approach. For an external sinusoidalapplied field with finite frequency ω, the local fields and potentials of composites in general Consist of components at allharmonics for cubic nonlinear constitutive relationships. We derive the local potentials of spherical coated composites atharmonics. Moreover, we give the formulae of the nonlinear effective AC susceptibility at the third harmonic frequency.
