Selective Actuation Enabled Multifunctional Magneto-mechanical Metamaterial for Programming Elastic Wave Propagation

TL;DR

This paper introduces a selective actuation method for magneto-mechanical metamaterials that enables multiple elastic wave control functionalities by applying magnetic fields to specific unit cells, enhancing programmability and application scope.

Contribution

The study presents a novel selective actuation strategy that allows inhomogeneous deformation and multifunctionality in magneto-mechanical metamaterials, surpassing previous uniform actuation approaches.

Findings

Demonstrated tunable elastic wave transmittance

Enabled elastic waveguiding and vibration isolation

Validated through simulations and experiments

Abstract

Active metamaterials are a type of metamaterial with tunable properties enabled by structural reconfigurations. Existing active metamaterials often achieve only a limited number of structural reconfigurations upon the application of an external load across the entire structure. Here, we propose a selective actuation strategy for inhomogeneous deformations of magneto-mechanical metamaterials, which allows for the integration of multiple elastic wave tuning functionalities into a single metamaterial design. Central to this actuation strategy is that a magnetic field is applied to specific unit cells instead of the entire metamaterial, and the unit cell can transform between two geometrically distinct shapes, which exhibit very different mechanical responses to elastic wave excitations. Our numerical simulations and experiments demonstrate that the tunable response of the unit cell, coupled with inhomogeneous deformation achieved through selective actuation, unlocks multifunctional capabilities of magneto-mechanical metamaterials such as tunable elastic wave transmittance, elastic waveguide, and vibration isolation. The proposed selective actuation strategy offers a simple but effective way to control the tunable properties and thus enhances the programmability of magneto-mechanical metamaterials, which also expands the application space of magneto-mechanical metamaterials in elastic wave manipulation.