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Phononic crystals (PnCs) can be designed to control and confine elastic waves. We present and use the optimization algorithm based on the two-stage genetic algorithm (GA) and the finite element method (FEM) to carry out the band gap optimization of the two-dimensional (2D) solid-solid binary-component PnCs.
The effects of the Poisson’s ratio of the solid host on the band gaps and point defect states of the mixed elastic wave modes in two-dimensional vacuum/solid porous PNCs are studied by numerical simulations. Four typical systems are considered. The four systems are, respectively, (I) the system with a square lattice and circular pores, (II) the system with a hexagonal lattice and circular pores, (III)...
Phononic crystals (PCs) are a kind of acoustic composite materials which have periodic structures and exhibit elastic wave (EW) band gaps. Due to their unique properties the phononic crystals have potential applications in acoustic devices and noise control, etc. The effects of both positive and negative Poisson's ratios on the phononic band gaps (PBGs) due to either Bragg scattering or locally resonance...
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