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Inspired by natural nacreous materials with the excellent performance, a kind of 3D nacreous composite material is designed based on the thought of staggered and combined soft and hard materials. In the 3D band structure analysis, the designed material generates an ultrawide low frequency band gap. Additionally, the influences on the band gap with different material parameters of the model are examined. Furthermore, the numerical tests for the transmission characteristics reveal the significant vibration attenuation effect of the nacreous material which fit remarkably well with the band gap.

Nacreous composite material, Phononic crystal, Band gap, Vibration isolation, Multi-level substructure