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

• DOI: 10.1021/acsami.2c08270
• Publication Date: 2022-07-26T11:44:30Z
• Authors: Yisong Bai; Chuanbao Liu; Yang Li; Jinxu Li; Lijie Qiao; Ji Zhou; Yang Bai
• Keywords: Auxetics; Poisson's ratio; Morphing

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