A novel two-dimensional (2D) mechanical metamaterial with highly programmable mechanical response under compressive load is presented in this paper by introducing hierarchical rotating structures, in which flexible structures are used to replace the rigid part in conventional rotating rigid structures. Multi-step deformation pathways and negative Poisson’s ratio were observed in in situ compression experiments and finite element simulations, suggesting that the mechanical behavior of the hierarchical metastructure is highly ordered and can be programmed by constraining angles of the proposed metamaterial. This work offers new insights to create mechanical metamaterial using hierarchical rotating structures for flexible devices and crashworthiness applications.

通过引入分层旋转结构，提出了一种新型的二维（2D）机械超材料，其在压缩载荷下具有高度可编程的机械响应，其中使用柔性结构代替常规旋转刚性结构中的刚性部件。在原位压缩实验和有限元模拟中观察到了多步变形路径和负泊松比，这表明分层超结构的力学行为是高度有序的，并且可以通过限制所提出的超材料的角度进行编程。这项工作为使用灵活的设备和防撞性应用程序的分层旋转结构创建机械超材料提供了新的见解。