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A novel 3D structure with tunable Poisson's ratio and tailorable coefficient of thermal expansion based on a tri-material triangle unit

机译：一种新型3D结构，可基于Triangling单元测量泊松比和可定制的热膨胀系数

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摘要

Auxetic materials and negative thermal expansion materials show great application potential in many important fields. In this paper, a novel three-dimensional truss structure with a tunable Poisson's ratio and tailorable coefficient of thermal expansion was developed. Since the deformation of each rod was dominated by axial tension or compression, the structure showed high stiffness. Equations regarding equivalent elasticity parameters and coefficients of thermal expansion of the structure were obtained by displacement and unit force methods. A numerical simulation verification was performed by ANSYS 16.0 software. The verification results indicated that the formulas have high precision and wide application scope. Through parametric analysis, we obtained the conditions for achieving a negative Poisson's ratio and negative thermal expansion coefficient. We also concluded that this material could realize a three-dimensional negative Poisson's ratio and bidirectional negative thermal expansion simultaneously by choosing reasonable geometric parameters and material combinations.
机译：辅助材料和负热膨胀材料在许多重要领域中显示出很大的应用潜力。在本文中，开发了一种具有可调谐泊松比和可批定系数的热膨胀系数的新型三维桁架结构。由于每个杆的变形通过轴向张力或压缩构成，因此该结构显示出高刚度。通过位移和单元力方法获得关于结构的等效弹性参数和热膨胀系数的方程。 ANSYS 16.0软件执行数值模拟验证。验证结果表明，公式具有高精度和广泛应用范围。通过参数分析，我们获得了实现负泊松比和负热膨胀系数的条件。我们还得出结论，通过选择合理的几何参数和材料组合，这种材料可以同时实现三维负泊松比和双向负热膨胀。

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