Boron Arsenate Scaled‐Up: An Enhanced Nano‐Mimicking Mechanical Metamaterial

Abstract

Novel mechanical metamaterials inspired by single crystal boron arsenate built at the macroscale using conventional materials are presented and investigated through finite element simulations. It is shown that these mechanical metamaterials can mimic, to some extent, the properties of boron arsenate with the more robust rotating rigid‐units mechanism being excellently replicated and even made to operate more efficiently through modifications of the geometry of the mechanical metamaterial. It is also shown that not all mechanisms causing auxeticity at the nanoscale can be upscaled due to the absence of the appropriate interactions at higher length scales. This confirms that already existing materials, which have been adequately characterized and studied, can prove to be a very useful source of information for the design of novel mechanical metamaterials which can exhibit even more auxetic properties than the original material itself.

Cancellation of Auxetic Properties in F.C.C. Hard Sphere Crystals by Hybrid Layer-Channel Nanoinclusions Filled by Hard Spheres of Another Diameter

“…Novel fabrics with auxetic properties [28,29,30,31], targeted for personal applications have been developed. Alongside the experimental studies, new theoretical models exhibiting negative Poisson's ratio [32,33,34,35,36,37,38,39,40,41,42,43,44,45,46] have been proposed. The search for the negative Poisson's ratio in known and naturally occurring materials revealed that around 70% of metals with cubic symmetry have such properties [47].…”

Auxetics and Other Systems with Unusual Characteristics

“…The investigations suggest that already existing materials can prove to be a very useful source of information for the design of novel mechanical metamaterials. [ 4 ]…”

Auxetic System Based on Rotating Hexagons and Triangles

“…[27] In addition to the aforementioned rotating quadrilaterals, auxetic systems in the form of interconnected rotating triangles have been developed, such as equilateral triangles [28] and scalene triangles. [29] A comprehensive survey of these works has been reviewed by Grima-Cornish et al [30] . Shortly thereafter, auxetic systems based on combined quadrilaterals and triangles [31][32][33][34] as well as rotating and nonrotating quadrilaterals [35] were introduced.…”