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Novel metamaterials with thermal-torsion and tensile-torsion coupling effects

机译：具有热扭转和拉伸扭转耦合效应的新型超材料

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摘要

Struts with different thermal expansion coefficients are employed to design novel 3D chiral metamaterials, which interestingly show twist deformation under both temperature variation and uniaxial load. Analytical expressions on the twist angle of the proposed metamaterials are established to relate with geometry of cell structure and material properties of struts, showing good agreement with numerical simulations. Both theoretical analysis and numerical simulations suggest that the tensile-torsion and thermal-torsion coupling effects of the metamaterials can be tuned by tailoring cells' geometric configuration and material selection. It is shown that the inclined rods' angle and the rods' stiffness play important roles in both the thermal-torsion and tensiletorsion coupling effects. Based on that, the conditions corresponding to maximum tensile-torsion and thermaltorsion coupling effects were determined, respectively. Besides, the thermal-torsion coupling effect is also proportional to the rods' thermal expansion coefficients. Moreover, it is shown that the two coupling effects are strongly correlated to each other. The contour maps of the twist angle of the metamaterial are obtained under simultaneous temperature change and uniaxial load. The proposed metamaterial is expected to find applications in sensors, actuators and wave convertors, especially in environments of alternating temperature changes.
机译：采用不同热膨胀系数的支柱用于设计新型的3D手性超材料，有趣地显示在温度变化和单轴负荷下的扭曲变形。建立了提出的超材料的扭曲角度的分析表达，与支柱的细胞结构和材料特性的几何形状建立，显示出与数值模拟的良好一致性。理论分析和数值模拟都表明，超材料的拉伸扭转和热扭转耦合效果可以通过定制细胞的几何配置和材料选择来调整。结果表明，倾斜杆的角度和杆的刚度在热扭转和张力滚过耦合效果中起重要作用。基于此，分别确定对应于最大拉伸扭转和热熔偶联效应的条件。此外，热扭转耦合效果也与杆的热膨胀系数成比例。此外，示出了两个耦合效果彼此强烈地相关。在同时温度变化和单轴载荷下获得超型材料的扭转角的轮廓图。预计建议的超材料将在传感器，执行器和波转换器中找到应用，特别是在交替温度变化的环境中。

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