Boron Arsenate Scaled‐Up: An Enhanced Nano‐Mimicking Mechanical Metamaterial. Issue 12 (19th October 2022)

• Record Type: Journal Article
• Authors: Grima-Cornish, James N.; Attard, Daphne; Vella-Żarb, Liana; Grima, Joseph N.; Evans, Kenneth E.
• Other Names: Wojciechowski Krzysztof W. guestEditor.
• Is Part Of: Physica status solidi. Volume 259:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-19
• Subjects: auxetic -- mechanical metamaterials -- mechanical properties -- negative Poisson's ratio; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.202200368
• Languages: English
• ISSNs: 0370-1972

Abstract

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. Abstract : Novel mechanical metamaterials inspired by single crystal boron arsenate are shown to be able to partially replicate the nanoscale behavior of the material. It is thus shown that a scale‐up approach should focus on materials for which the mechanism causing the anomalous auxetic/mechanical behavior is mainly dependent on geometry, rather than on complex interactions.