期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 248, 期 1, 页码 117-122出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201083982
关键词
auxetic behaviour; calix[4]arene; mechanical properties; Poisson's ratio
资金
- EPSRC
- University of Exeter
- Maltese government
Auxetics exhibit the anomalous property of getting fatter rather than thinner when uniaxially stretched [negative Poisson's ratio (NPR)]. This paper presents an analytical model of a structure constructed from umbrella type sub-units which is predicted to exhibit this property together with the results of mechanical tests of a structure having this geometry. It is shown that such systems can exhibit negative on-axis Poisson's ratio of -1 which means that they maintain their aspect ratio, while Poisson's ratio becomes less negative for loading off-axis. It is also shown that this model can explain the sign and anisotropy of Poisson's ratio demonstrated by a molecular level system constructed from calix(4)arenes having the same geometry. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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