Harnessing structural hierarchy to design lightweight phononic crystals

Abstract eng:
We numerically investigate the elastic wave propagation in hierarchical honeycombs that are constructed by replacing the cell walls of regular honeycombs with hexagonal, kagome, and triangular substructures, respectively. We show that the hierarchically architected honeycombs can exhibit broad and multiple phononic band gaps, which result from the multiple scatterings in the hierarchical architectures. Our analysis reveals that the existence of these prominent wave attenuation features strongly depend on two geometric parameters, hierarchical length ratio and number of substructures away from the central axis. Furthermore, the introduction of structural hierarchy also endows the hierarchical honeycombs with enhanced stiffness. We predict that the proposed hierarchical honeycombs can realize unique combinations of the prominent wave attenuation capability and enhanced specific stiffness, thereby providing opportunities to design lightweight phononic crystals.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket