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首页> 外文期刊>Smart Materials & Structures >Unimode metamaterials exhibiting negative linear compressibility and negative thermal expansion
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Unimode metamaterials exhibiting negative linear compressibility and negative thermal expansion

机译：单模超材料表现出负的线性可压缩性和负的热膨胀

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摘要

Unimode metamaterials made from rotating rigid triangles are analysed mathematically for their mechanical and thermal expansion properties. It is shown that these unimode systems exhibit positive Poisson's ratios irrespective of size, shape and angle of aperture, with the Poisson's ratio exhibiting giant values for certain conformations. When the Poisson's ratio in one loading direction is larger than +1, the systems were found to exhibit the anomalous property of negative linear compressibility along this direction, that is, the systems expand in this direction when hydrostatically compressed. Also discussed are the thermal expansion properties of these systems under the assumption that the units exhibit increased rotational agitation once subjected to an increase in temperature. The effect of the geometric parameters on the aforementioned thermo-mechanical properties of the system, are discussed, with the aim of identifying negative behaviour.
机译：对由旋转的刚性三角形制成的单模超常材料进行了机械和热膨胀特性的数学分析。结果表明，这些单模系统无论孔径大小，形状和孔径角度如何，都显示出正的泊松比，而泊松比对于某些构象则显示出巨大的值。当在一个载荷方向上的泊松比大于+1时，发现系统表现出沿该方向具有负线性可压缩性的异常性质，即，当静水压缩时，系统在该方向上膨胀。还讨论了这些系统的热膨胀特性，这些假设是假设一旦温度升高，单元将显示出增加的旋转搅动。讨论了几何参数对上述系统的热机械性能的影响，目的是确定不良行为。

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