Bifunctional Metamaterials Incorporating Unusual Geminations of Poisson’s Ratio and Coefficient of Thermal Expansion,ACS Applied Materials & Interfaces

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Bifunctional Metamaterials Incorporating Unusual Geminations of Poisson’s Ratio and Coefficient of Thermal Expansion
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-10-25 , DOI: 10.1021/acsami.2c11702
Zhengtong Han ₁ , Xiaoyujie Xiao ₁ , Jiaxin Chen ₁ , Kai Wei _{1,

2} , Zhonggang Wang ₂ , Xujing Yang ₁ , Daining Fang ₃

Affiliation

Natural materials overwhelmingly shrink laterally under stretching and expand upon heating. Through incorporating Poisson’s ratio and coefficient of thermal expansion (PR and CTE) in unusual geminations, such as positive PR and negative CTE, negative PR and positive CTE, and even zero PR and zero CTE, bifunctional metamaterials would generate attractive shape control capacity. However, reported bifunctional metamaterials are only theoretically constructed by simple skeletal ribs, and the magnitudes of the bifunctions are still in quite narrow ranges. Here, we propose a methodology for generating novel bifunctional metamaterials consisting of engineering polymers. From concept to refinement, the topology and shape optimization are integrated for programmatically designing bifunctional metamaterials in various germinations of the PR and CTE. The underlying deformation mechanisms of the obtained bifunctions are distinctly revealed. All of the designs with complex architectures and material layouts are fabricated using the multimaterial additive manufacturing, and their effective properties are experimentally characterized. Good agreements of the design, simulation, and experiments are achieved. Especially, the accessible range of the bifunction, namely, PR and CTE, is remarkably enlarged nearly 4 times. These developed approaches open an avenue to explore the bifunctional metamaterials, which are the basis of myriad mechanical- and temperature-sensitive devices, e.g., morphing structures and high-precision components of the sensors/actuators in aerospace and electronical domains.

中文翻译：

结合泊松比和热膨胀系数的不寻常组合的双功能超材料

天然材料在拉伸时绝大多数会横向收缩，在加热时会膨胀。通过将泊松比和热膨胀系数（PR和CTE）结合到不寻常的孪生中，例如正PR和负CTE、负PR和正CTE，甚至零PR和零CTE，双功能超材料将产生有吸引力的形状控制能力。然而，报道的双功能超材料仅在理论上由简单的骨架肋构成，并且双功能的大小仍然在相当窄的范围内。在这里，我们提出了一种生成由工程聚合物组成的新型双功能超材料的方法。从概念到细化，拓扑和形状优化相结合，以编程方式设计各种 PR 和 CTE 萌芽的双功能超材料。清楚地揭示了所获得的双函数的潜在变形机制。所有具有复杂架构和材料布局的设计均采用多材料增材制造技术制造，并通过实验表征了其有效性能。设计、仿真和实验均取得了良好的一致性。特别是双功能PR和CTE的可及范围显着扩大了近4倍。这些开发的方法开辟了探索双功能超材料的途径，双功能超材料是无数机械和温度敏感设备的基础，例如航空航天和电子领域传感器/执行器的变形结构和高精度组件。

更新日期：2022-10-25

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