Auxetic Behavior and Other Negative Thermomechanical Properties from Rotating Rigid Units. Issue 2 (23rd November 2021)

• Record Type: Journal Article
• Authors: Grima-Cornish, James N.; Attard, Daphne; Grima, Joseph N.; Evans, Kenneth E.
• Is Part Of: Physica status solidi. Volume 16:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-23
• Subjects: architected materials -- auxetics -- mechanical metamaterials -- negative linear compressibility -- negative Poisson's ratios -- negative thermal expansion; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202100322
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : Auxetics display the anomalous property of expanding laterally when uniaxially stretched, that is, a negative Poisson's ratio, a property that arises from 1) the presence of specific geometric features within the nano/macrostructure of the material and 2) amenable deformations in response to the applied stimulus. Herein, how ancient symmetrical esthetic artifacts have been transformed to functional auxetics through mechanisms that have ripened the field of "mechanical metamaterials" and "architected materials" in the last decades is explored. In particular, the important role and various implementations, both in 2D and 3D, of "rotating rigid units, " which range from "rotating squares" to much more complex renditions at various scales of structure, are looked at. The role of rotating rigid units to generate negative thermal expansion and negative compressibility is also delved into. Abstract : The important role of rotating rigid units in the field of mechanical metamaterials and architected materials is explored. In particular, herein, various implementations of this mechanism are delved into, ranging from rotating squares to much more complex renditions, to generate negative Poisson's ratios (auxetic behavior), negative thermal expansion, and/or negative compressibility.