The behavior of the electromagnetic field is described by Maxwell's equations [18,45], It is shown in [53] that for a wide class of electroelastic dynamic problems, where the deformation wave length is much less than that of the electromagnetic wave of the same frequency, Maxwell's equations can be replaced by electrostatic equations in vector form:

Or they can be replaced in scalar form when changing to D and E by formulas 2.13:

The equations describing a piezoelectric body include the equilibrium equations 2.11, the strain-displacement formulas 2.7, the piezoeffect equations 2.14 or 2.16, and the electrostatic equations 2.18 or 2.19.

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