Auxetic metamaterials are a type of metamaterial with a negative Poisson's ratio, so that axial elongation causes transversal elongation (in contrast to an ordinary material, where stretching in one direction causes compression in the other direction).
Auxetics can be single molecules, crystals, or a particular structure of macroscopic matter.[1][2]
Auxetic materials are used in protective equipment such as body armor, helmets, and knee pads, as they absorb energy more effectively than traditional materials. They are also used in devices such as medical stents or implants. Auxetic fabrics can be used to create comfortable and flexible clothing, as well as technical fabrics for applications such as aerospace and sports equipment. Auxetic materials can also be used to create acoustic metamaterials for controlling sound and vibration.[3]
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evanswas invoked but never defined (see the help page). - ^ Liu, Yangzuo; Zhao, Changfang; Xu, Cheng; Ren, Jie; Zhong, Jianlin (1 December 2023). "Auxetic meta-materials and their engineering applications: a review". Engineering Research Express. 5 (4): 042003. doi:10.1088/2631-8695/ad0eb1. ISSN 2631-8695.