Metamaterials with negative Poisson's ratio (NPR) have a broad range of application background, such as aerospace engineering, automotive engineering, medical instrument engineering, and wearable engineering. Herein, a novel strategy for constructing 3D dislocated chiral metamaterial is proposed that can achieve NPR effect in three directions. According to this strategy, a new dislocated chiral metamaterial composed of dislocated tetrachiral honeycombs and inclined rods is designed and selected as an example to investigate the effectiveness of the strategy. Experiments and numerical simulations are carried out to study the mechanical properties of the new metamaterial, confirming that this metamaterial exhibits NPR effect. The influence of geometric parameters on the elastic constants of the metamaterial is discussed based on experimental and numerical results. Meanwhile, the local loading performances of this dislocated chiral metamaterial and the previous aligned chiral metamaterial are studied and compared. Results show that this dislocated metamaterial possesses a stronger damage resistance capacity than the aligned one. By adjusting the rotational direction of ligaments in honeycombs and the arrangement of inclined rods, more special 3D dislocated chiral metamaterials with advanced properties are available, such as metamaterial with both positive and NPRs, metamaterial with compression–torsion effect.

中文翻译：

---

负泊松比构造3D位错手性超材料的新策略

具有负泊松比（NPR）的超材料具有广泛的应用背景，例如航空航天工程，汽车工程，医疗仪器工程和可穿戴工程。在本文中，提出了一种新的构造3D位错手性超材料的策略，该策略可以在三个方向上实现NPR效果。根据该策略，设计并选择了由错位的四手性蜂窝和倾斜的棒组成的错位的手性超材料，以研究该策略的有效性。通过实验和数值模拟研究了新型超材料的力学性能，证实了这种超材料具有NPR效应。基于实验和数值结果，讨论了几何参数对超材料弹性常数的影响。同时，研究和比较了这种错位的手性超材料与先前排列的手性超材料的局部载荷性能。结果表明，这种错位的超材料具有比对准的材料更强的抗损伤能力。通过调整蜂窝状韧带的旋转方向和倾斜杆的排列，可以使用具有特殊性能的更特殊的3D位错手性超材料，例如具有正和NPR的超材料，具有压缩“扭曲”效果的超材料。研究并比较了这种错位的手性超材料与先前排列的手性超材料的局部载荷性能。结果表明，这种错位的超材料具有比对准的材料更强的抗损伤能力。通过调整蜂窝状韧带的旋转方向和倾斜杆的排列，可以使用具有特殊性能的更特殊的3D错位手性超材料，例如具有正和NPR的超材料，具有压缩“扭曲”效果的超材料。研究并比较了这种错位的手性超材料与先前排列的手性超材料的局部载荷性能。结果表明，这种错位的超材料具有比对准的材料更强的抗损伤能力。通过调整蜂窝状韧带的旋转方向和倾斜杆的排列，可以使用具有特殊性能的更特殊的3D错位手性超材料，例如具有正和NPR的超材料，具有压缩“扭曲”效果的超材料。