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首页> 外文期刊>Advanced Materials >2D Mechanical Metamaterials with Widely Tunable Unusual Modes of Thermal Expansion
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2D Mechanical Metamaterials with Widely Tunable Unusual Modes of Thermal Expansion

机译：具有广泛可调的热膨胀异常模式的2D机械超材料

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摘要

Most natural materials expand uniformly in all directions upon heating. Artificial, engineered systems offer opportunities to tune thermal expansion properties in interesting ways. Previous reports exploit diverse design principles and fabrication techniques to achieve a negative or ultralow coefficient of thermal expansion, but very few demonstrate tunability over different behaviors. This work presents a collection of 2D material structures that exploit bimaterial serpentine lattices with micrometer feature sizes as the basis of a mechanical metamaterials system capable of supporting positiveegative, isotropic/anisotropic, and homogeneous/heterogeneous thermal expansion properties, with additional features in unusual shearing, bending, and gradient modes of thermal expansion. Control over the thermal expansion tensor achieved in this way provides a continuum-mechanics platform for advanced strain-field engineering, including examples of 2D metamaterials that transform into 3D surfaces upon heating. Integrated electrical and optical sources of thermal actuation provide capabilities for reversible shape reconfiguration with response times of less than 1 s, as the basis of dynamically responsive metamaterials.
机译：大多数天然材料在加热时会在所有方向均匀膨胀。人工设计的系统提供了以有趣的方式调整热膨胀特性的机会。以前的报告利用各种设计原理和制造技术来实现负的或超低的热膨胀系数，但很少有人展示出在不同行为上的可调性。这项工作提出了二维材料结构的集合，这些结构利用具有微米特征尺寸的双材料蛇形晶格作为机械超材料系统的基础，该系统能够支持正/负，各向同性/各向异性以及均质/异质热膨胀特性，并具有不寻常的附加功能热膨胀的剪切，弯曲和梯度模式。以这种方式实现的对热膨胀张量的控制为高级应变场工程提供了一个连续力学平台，其中包括在加热后转变为3D表面的2D超材料的示例。作为动态响应超材料的基础，热激励的集成电光源和光源为响应时间小于1 s的可逆形状重新配置提供了功能。

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  • 来源
    《Advanced Materials》 |2019年第48期|1905405.1-1905405.10|共10页
  • 作者

    Ni Xiaoyue; Guo Xiaogang; Li Jiahong; Huang Yonggang; Zhang Yihui; Rogers John A.;

  • 作者单位

    Northwestern Univ Ctr Biointegrated Elect Evanston IL 60208 USA;

    Tsinghua Univ Ctr Flexible Elect Technol Dept Engn Mech AML Beijing 100084 Peoples R China;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Ctr Biointegrated Elect Evanston IL 60208 USA|Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA|Northwestern Univ Dept Mech Engn Evanston IL 60208 USA|Northwestern Univ Dept Civil & Environm Engn Evanston IL 60208 USA;

    Northwestern Univ Ctr Biointegrated Elect Evanston IL 60208 USA|Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA|Northwestern Univ Dept Mech Engn Evanston IL 60208 USA|Northwestern Univ Simpson Querrey Inst Chicago IL 60611 USA|Northwestern Univ Dept Biomed Engn Evanston IL 60208 USA|Northwestern Univ Dept Chem Evanston IL 60208 USA|Northwestern Univ Dept Elect & Comp Engn Evanston IL 60208 USA|Northwestern Univ Dept Neurol Surg Evanston IL 60208 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    bimaterial lattices; programmable metamaterials; strain-field engineering; tunable thermal properties; unusual thermal expansion;

    机译：双材料晶格可编程超材料;应变场工程;可调节的热性能;异常的热膨胀;

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