Abstract
Zero Poisson's ratio (ZPR) mechanical metamaterials can yield no transverse displacements when unidirectionally compressed, and cylindrical sandwich meta-structures composed of semi re-entrant (SRE) ZPR metamaterials are thus explored for applications on cylindrical shells of underwater equipment or submersible structures. A group of ZPR unit cells with specified pre-strained wave propagation characteristics and adequate load-bearing capabilities is optimally designed based on the periodic boundary condition (PBC) and Bloch's Theorem. The sound transmission and pressure-resistant performance of cylindrical sandwich meta-structures comprising the homogeneous and graded SRE ZPR unit cells are then investigated. The results show that the designed meta-structures can perfectly yield better vibroacoustic attenuation behavior within the specified frequency regions corresponding to the pre-strained band gaps and safely bear the hydrostatic pressure equivalent to 1000 m depth with low weight-bulk ratios. In addition, the functionally graded metamaterial core can boost vibroacoustic performance within broader frequency ranges.
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