Wave attenuation and trapping in 3D printed cantilever-in-mass metamaterials with spatially correlated variability.

ABSTRACT: Additive manufacturing has become a fundamental tool to fabricate and experimentally investigate mechanical metamaterials and phononic crystals. However, this manufacturing process produces spatially correlated variability that breaks the translational periodicity, which might compromise the wave propagation performance of metamaterials. We demonstrate that the vibration attenuation profile is strictly related to the spatial profile of the variability, and that there exists an optimal disorder degree below which the attenuation bandwidth widens; for high disorder levels, the band gap mistuning annihilates the overall attenuation. The variability also induces a spatially variant locally resonant band gap that progressively slow down the group velocity until an almost zero value, giving rise

SUBMITTER: Beli D 

PROVIDER: S-EPMC6449363 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature