具有可定制负泊松比和多种热变形模式下任意热膨胀的可编程机械超材料,ACS Applied Materials & Interfaces

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具有可定制负泊松比和多种热变形模式下任意热膨胀的可编程机械超材料
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-07-26 , DOI: 10.1021/acsami.2c08270
Yisong Bai ₁ , Chuanbao Liu ₂ , Yang Li ₁ , Jinxu Li ₁ , Lijie Qiao ₁ , Ji Zhou ₃ , Yang Bai ₁

Affiliation

机械超材料为设计和优化微结构拓扑以实现反直觉的变形铺平了道路，包括负泊松比 (NPR) 和负热膨胀 (NTE)。以前的研究总是局限于单一的异常机械或热变形，但目前高精度机械或光学设备的应用总是需要它们的组合以及定制的各向异性变形参数。这项工作开发了基于手性和反手性结构的可编程二维 (2D) 机械超材料，这些结构由弯曲的双材料条构成，以产生可定制的 NPR 和任意热变形。机械超材料的热膨胀系数可在负值、接近零、和正值取决于双材料配置和弯曲条带的几何参数，而 NPR 的值主要由弧度决定。此外，它可以通过对单位单元进行编码来进行编程，以展示结合均匀、梯度和剪切模式的定制和各向异性热变形。所提出的机械超材料通过多材料三维（3D）打印制造，并通过实验验证了不寻常的变形模式，这与有限元分析的结果非常吻合。这项工作展示了一种可行的方法，通过针对特定工程应用（包括消除热应力、形状变形和智能执行器）的简单块构建来实现定制的机械和热变形。

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Programmable Mechanical Metamaterials with Tailorable Negative Poisson’s Ratio and Arbitrary Thermal Expansion in Multiple Thermal Deformation Modes

Mechanical metamaterials pave a way for designing and optimizing microstructure topology to achieve counterintuitive deformation including negative Poisson’s ratio (NPR) and negative thermal expansion (NTE). Previous studies were always limited to single anomalous mechanical or thermal deformation, but current applications for high-precision mechanical or optical equipment always require their combination and customized and anisotropic deformation parameters. This work develops programmable two-dimensional (2D) mechanical metamaterials based on chiral and antichiral structures constructed with curved bimaterial strips to produce tailorable NPR and arbitrary thermal deformation. The coefficient of thermal expansion of the mechanical metamaterials is tunable on a large scale across negative, near-zero, and positive values depending on the bimaterial configurations and geometrical parameters of curved strips, while the value of NPR is mainly determined by the radian. Furthermore, it is programmable by coding the unit cells to exhibit customized and anisotropic thermal deformation combining homogeneous, gradient, and shear modes. The proposed mechanical metamaterials are fabricated by multimaterial three-dimensional (3D) printing, and the unusual deformation modes are verified experimentally, which is well in agreement with the results of finite element analysis. This work demonstrates a feasible approach to achieving customized mechanical and thermal deformation through easy block building for specific engineering applications including eliminating thermal stress, shape morphing, and smart actuators.

更新日期：2022-07-26

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