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Hoberman-sphere-inspired lattice metamaterials with tunable negative thermal expansion

机译：可调负热膨胀的霍伯曼球启发的晶格超材料

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摘要

Materials with engineered thermal expansion coefficients, capable of avoiding failure or irreversible destruction of structures and devices, are important for aerospace, civil, biomedical, optics, and semiconductor applications. In natural materials, thermal expansion usually cannot be adjusted easily and a negative thermal expansion coefficient is still uncommon. Here we propose a novel architected lattice bi-material system, inspired by the Hoberman sphere, showing a wide range of tunable thermal expansion coefficient from negative to positive, -1.04 x 10(-3) degrees C-1 to 1.0 x 10(-5) degrees C-1. Numerical simulations and analytical formulations are implemented to quantify the evolution of the thermal expansion coefficients and reveal the underlying mechanisms responsible for this unusual behavior. We show that the thermal expansion coefficient of the proposed metamaterials depends on the thermal expansion coefficient ratio and the axial stiffness ratio of the constituent materials, as well as the bending stiffness and the topological arrangement of the constitutive elements. The finding reported here provides a new routine to design architected metamaterial systems with tunable negative thermal expansion for a wide range of potential applications.
机译：具有工程热膨胀系数的材料，能够避免结构和设备发生故障或不可逆转的破坏，对于航空航天，民用，生物医学，光学和半导体应用而言至关重要。在天然材料中，通常不容易调节热膨胀，并且负热膨胀系数仍然很少见。在这里，我们提出一种受Hoberman球启发的新颖的架构晶格双材料系统，该系统显示了从负到正的可调热膨胀系数范围，从-1.04 x 10（-3）摄氏度C-1到1.0 x 10（- 5）C-1度。进行数值模拟和分析公式化以量化热膨胀系数的演变并揭示造成这种异常行为的潜在机理。我们表明，所提出的超材料的热膨胀系数取决于组成材料的热膨胀系数比和轴向刚度比，以及本构元件的弯曲刚度和拓扑结构。此处报告的发现提供了一种新的例程，可以设计具有可调节的负热膨胀的结构化超材料系统，适用于广泛的潜在应用。

著录项

  • 来源
    《Composite Structures》 |2018年第4期|586-597|共12页
  • 作者

    Li Yangbo; Chen Yanyu; Li Tiantian; Cao Siyu; Wang Lifeng;

  • 作者单位

    China Three Gorges Univ, Coll Hydraul & Environm Engn, Yichang 443002, Hubei, Peoples R China;

    Natl Renewable Energy Lab, Transportat & Hydrogen Syst Ctr, Golden, CO 80401 USA;

    SUNY Stony Brook, Dept Mech Engn, Stony Brook, NY 11794 USA;

    China Three Gorges Univ, Coll Hydraul & Environm Engn, Yichang 443002, Hubei, Peoples R China;

    SUNY Stony Brook, Dept Mech Engn, Stony Brook, NY 11794 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Metamaterials; Lattice; Negative thermal expansion;

    机译：超材料;晶格;负热膨胀;

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