Auxetic elastomers: Mechanically programmable meta-elastomers with an unusual Poisson's ratio overcome the gauge limit of a capacitive type strain sensor. (September 2019)

• Record Type: Journal Article
• Authors: Lee, Young-Joo; Lim, Seung-Min; Yi, Seol-Min; Lee, Jeong-Ho; Kang, Sung-gyu; Choi, Gwang-Mook; Han, Heung Nam; Sun, Jeong-Yun; Choi, In-Suk; Joo, Young-Chang
• Is Part Of: Extreme mechanics letters. Volume 31(2019)
• Publication Date: 2019-09
• Subjects: Mechanical metamaterials -- Auxetics -- Poisson's ratio -- Programmable elastomers -- Capacitive strain sensor; Mechanics -- Periodicals; Mechanics, Applied -- Periodicals; Mechanics; Electronic journals; Periodicals; 531.05
• DOI: 10.1016/j.eml.2019.100516
• Languages: English
• ISSNs: 2352-4316

Abstract

Abstract: How can we modulate the inherent Poisson's ratio value of soft elastomeric materials? The theoretical limit value of the Poisson's ratio of isotropic materials can be defined from −1 to 0.5 but elastomers generally take the Poisson's ratio of 0.5. Herein, we introduce and establish the concept of a mechanical meta elastomer called "auxetic elastomer". This is a continuum-solid elastomer having unique programmable elastic properties of Poisson's ratio that are beyond their conventional ranges, and include in-plane negative and out-of-plane high positive Poisson's ratios. Leveraging these unique deformation characteristics, we applied auxetic elastomers as a soft dielectric material for a highly stretchable capacitive-type strain sensor that overcomes the inherent performance limitations in terms of the low gauge factor.