Double-layer sandwich annulus with ultra-low thermal expansion
Double-layer sandwich annulus with ultra-low thermal expansion
复制标题
超低热膨胀双层夹层环空
DOI：
10.1016/j.compstruct.2018.07.075
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发表时间：
2018-11
影响因子：
6.3
通讯作者：
Yu Jingjun
中科院分区：
文献类型：
--
作者：
Xie Yan;Pei Xu;Yu Jingjun
零或负热膨胀系数（CTE）材料在自然界中是一种罕见的反常现象，但在光学元件和精密仪器等工程应用中却很常见。人工超材料提供了一种新的途径，使材料具有可调的CTE和优异的机械性能。然而，这些由周期性结构设计的材料通常缺乏均匀性，因此集成到应用中是有限的。在这里，一个双层夹层环集成叉状晶格单元和连续界面构建。在此基础上，对有效热膨胀系数的可调性进行了理论建模，揭示了其与环的直径、叉状单元中具有较高热膨胀系数的梁的长度以及组成材料的热膨胀系数的关系。热性能的特点也是实验上的双材料金属样品的目标为零CTE故意。测量结果表明，在30-220 °C的温度变化下，具有超低CTE（内环为0.54 × 10− 6/° C，外环为0.38 × 10−6/°C）。这种具有可调CTE的双层夹层环是尺度无关的，并且在恶劣热环境中的高速轴承和反射镜支撑中非常有前途。
Zero or negative coefficient of thermal expansion (CTE) material is a rare abnormal phenomenon in nature but preferred in such engineering applications as optical components and precision instruments, etc. Most of them in nature are brittle and can operate only in a narrow temperature range. Artificial metamaterials offer a new route towards materials with tunable CTEs and excellent mechanical properties. However, these materials engineered by periodic architectures generally lack homogeneity, and thus the integrations into applications are limited. Here, a double-layer sandwich annulus integrating fork-like lattice cells and continuous interfaces is constructed. As the basis, the tunability of effective CTEs is theoretically modeled to reveal its dependence on the diameters of rings, the lengths of beams with higher CTE in fork-like cells and constituent materials’ CTEs. The thermal properties are also characterized experimentally on a bi-material metallic sample targeting for zero CTE purposely. The measured results demonstrate the ultra-low CTEs (0.54 × 10−6/°C for inner ring and 0.38 × 10−6/°C for outer ring) with a temperature variation of 30–220 °C. Such a double-layer sandwich annulus with tunable CTEs is scale independent and highly promising in high-speed bearings and mirror supports in harsh thermal environments.
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影响因子：
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