Merging Bragg and Local Resonance Bandgaps in Perforated Elastic Metamaterials with Embedded Spiral Holes

TL;DR: In this article , a rainbow metamaterial beam embedded with graded arrangement of ABHs is proposed to achieve broadband vibration attenuation, and the results reveal that the generation of broad bandgaps can be explained by the combination of local resonance and Bragg scattering effects.

TL;DR: In this article , the authors proposed a non-self-similar hierarchical geometries for elastic metamaterials to create periodic structures supporting multiple, highly attenuative and broadband bandgaps involving different scattering mechanisms, namely, Bragg scattering, local resonance and/or inertial amplification, at different frequencies.

TL;DR: In this article , the elastic metamaterial plates with various lattices are studied with numerical and experimental methods, and the applicability of irreducible Brillouin zone (IBZ) for different lattices is also investigated through iso-frequency contours.

TL;DR: In this paper , a multi-step quasi-zero-stiffness metamaterial (MS-QZSM) is proposed, which exhibits potential applications in various engineering scenarios, such as multi-vibration mitigation and mechanical protection.

TL;DR: In this article, the linearized theory of elasticity was introduced and the elasticity of a one-dimensional motion of an elastic continuum was modeled as an unbound elastic continuum.

TL;DR: This review traces the development of acoustic metamaterials from the initial findings of mass density and bulk modulus frequency dispersions in locally resonant structures to the diverse functionalities afforded by the perspective of negative constitutive parameter values, and their implications for acoustic wave behaviors.

TL;DR: The techniques developed in this work can be used to design lattices with a desired band structure and the observed spatial filtering effects due to anisotropy at high frequencies (short wavelengths) of wave propagation are consistent with the lattice symmetries.

TL;DR: An elastic metamaterial with chiral microstructure made of a single-phase solid material that aims to achieve subwavelength negative refraction of elastic waves and may be used as a flat lens for elastic wave focusing.