Abstract
This chapter describes constitutive properties of multifunctional nanocomposites, which are modified by carbon and boron nitride nanotubes for the enhancement of their electromagnetic properties and piezoelectric capabilities. Dependence of electric conductivity of nanocomposites on the volume fraction and the aspect ratio of carbon nanotubes has been described. A new normalized percolation relation has been presented by introducing the normalized volume fraction associated with the onset of percolation and conductivity in the carbon nanotube-reinforced nanocomposites. Effectiveness of percolation relations for the approximation of the experimental data for the conductivity of nanocomposites has been reviewed. A scaling relation and its modification based on the normalized volume fraction of carbon nanotubes are discussed in order to take into account the aspect ratio of carbon nanotubes on the conductivity of nanocomposites. Constitutive models for the electromechanical and thermomechanical coupling in nanocomposites, as well as the combined magnetoelastic, electromechanical, and thermal effects are presented.
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