Planar Mechanical Metamaterials with Embedded Permanent Magnets.

Viacheslav Slesarenko

doi:10.3390/ma13061313

Abstract

The design space of mechanical metamaterials can be drastically enriched by the employment of non-mechanical interactions between unit cells. Here, the mechanical behavior of planar metamaterials consisting of rotating squares is controlled through the periodic embedment of modified elementary cells with attractive and repulsive configurations of the magnets. The proposed design of mechanical metamaterials produced by three-dimensional printing enables the efficient and quick reprogramming of their mechanical properties through the insertion of the magnets into various locations within the metamaterial. Experimental and numerical studies reveal that under equibiaxial compression various mechanical characteristics, such as buckling strain and post-buckling stiffness, can be finely tuned through the rational placement of the magnets. Moreover, this strategy is shown to be efficient in introducing bistability into the metamaterial with an initially single equilibrium state.

Highlights

Mechanical metamaterials possess unique properties and demonstrate unconventional behavior owing to their intricate internal architecture [1]
The rotation continued with an increase in applied strain ε until all squares rotated by 45◦ degrees, and the metamaterial completed its transition to the closed state (Figure 1b), when ε = εcl
The planar metamaterial produced by three-dimensional printing enables efficient and fast adjustment of the mechanical properties by rearranging the magnetic cells

Summary

Introduction

Mechanical metamaterials possess unique properties and demonstrate unconventional behavior owing to their intricate internal architecture [1]. The mechanical properties of the constituents do not play a significant role in defining the overall performance of the metamaterial. Extreme strength can be achieved even in metamaterials made from relatively weak base components due to the rational design of their interior [2]. It resembles the design principles of natural materials and composites that demonstrate extremely high performance despite relatively weak constituents [3,4,5,6]. Similar design principles can be employed for the creation of functional mechanical metamaterials that are responsive [11], programmable [12], adaptive [13], and smart [14]

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Conclusion