Three-dimensional anti-chiral auxetic metamaterial with tunable phononic bandgap

Abstract

Auxetic metamaterials have received wide attention due to their idiosyncratic physical properties. In this paper, experiments and simulations were performed to study the mechanical and acoustic properties of a 3D anti-chiral auxetic metamaterial subjected to quasi-static loading. The results shows that Poisson's ratio of the designed metamaterial can be changed from −0.45 to 0.35 with different cell parameters. Acoustic tests show that the designed metamaterial provides an ultra-wide phononic bandgap and exhibits outstanding wave attenuation properties. By applying rational tensile/compression force, the bandgap is widened/narrowed, which indicates the tunability of the bandgap through deformation. Moreover, the bandgap tuning is through all high symmetry points in the Brillouin zone due to the iso-auxeticity of the metamaterial. This study provides a possible way for controlling the bandgap with the deformable metamaterial.

Three-Dimensional Trampolinelike Behavior in an Ultralight Elastic Metamaterial

“…Auxetic microlattices are hence excellent candidates for multiple functionalities and some recent studies have also engineered microlattices to possess band gaps for elastic waves alongside auxeticity. However, the majority of these works are theoretical and have been constrained to 2D wave propagation [35][36][37], and the few designs proposed for 3D [8,38,39] still rely on heavy masses in the core of the unit cells, to induce negative density-based bandgaps. This study on the other hand, proposes a 3D auxetic microlattice that possesses a trampolinelike dynamic negative-modulus-based resonance that enables wide band gaps despite the material being ultralight.…”

“…Elastic metamaterials offer the unique advantage of controlling acoustic [1,2] and elastic waves [3,4] owing to their ability of tailoring band gaps at wavelengths much larger than their periodicities. These metamaterials are typically constructed by inserting heavy mass at the core of the periodic scaffold, which induces a local resonance phenomenon [5][6][7][8][9][10][11][12][13][14][15]. Via tailoring the lattice geometry and stiffness of the mass inclusions, a range of low-frequency and wide band gaps can be generated and tuned.…”

Sequential metamaterials with alternating Poisson’s ratios

“…Structural applications include indentation-resistant materials that contract around impacting objects 4 , 5 , self-anchoring fasteners and screws 25 , and materials that passively change their shape, size, or surface contour in response to particular loads 4 – 7 . Additionally, auxeticity has been employed to realize materials with highly tunable phononic bandgaps 26 , 27 , transmission materials that improve actuator resolution and sensor sensitivity 28 , and color-changing materials with colored voids that alter their size and thus visual prevalence as their lattices are loaded 29 .…”

Low-Frequency Bandgaps of the Lightweight Single-Phase Acoustic Metamaterials with Locally Resonant Archimedean Spirals

“…To endow the LPHM with the simultaneous advantages of lightweight efficiency and low-frequency bandgaps, the single-phase lightweight periodic honeycomb materials with subwavelength bandgaps have attracted much attention in the research community [ 18 , 30 , 31 , 32 , 33 , 34 ]. Chen et al [ 35 , 36 ] designed a star-assisted metamaterial with a low-frequency bandgap and double-negative characteristics in a certain frequency range using single-phase materials, which solved the problem that conventional double-negative acoustic metamaterials are difficult to be applied due to their complex structure and multi-phase material composition.…”