In this article, based on the Euler-Bernoulli hypothesis and the Galerkin method, ananalysis of the nonlinear dynamic stability for a clamped-guided piezoelectric laminated microbeam under both a periodic axial force and a symmetric electrostatic load is presented. By using the incremental harmonic balanced method (IHBM), the boundary of the principal region of instability is got. In the numerical calculation, the effect of the environmental damping, geometric nonlinear, piezoelectric effect and the symmetric electrostatic load on the principal region of instability is discussed.

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