Polarity refers to the phenomenon of an object exhibiting opposite intrinsic properties in opposing directions, which plays a fundamental role in various fields including mechanical diodes, mechanical logic gates, and shock protection. This paper proposes a new mechanical metamaterial with polar and dual deformation characteristics based on a fishbone-like structure to enable a given surface structure to be hard while its opposite side is soft, while also enabling the task of adapting to different load levels on the soft side. The mechanical metamaterial displays double-stress platforms and exhibits a significant difference in mechanical response when loaded on opposite sides. Through numerical simulations, the polarity characteristic spectrum of the mechanical metamaterial is identified. The stress platform with a soft boundary predicted using Euler's instability theory was verified through both numerical simulation and experimentation. The dimensionless parameters for load differences are defined to evaluate the polar characteristics of polar mechanical metamaterials, and design guidelines are provided for achieving significant polar characteristics of polar mechanical metamaterials by discussing the influence of geometrical parameters. The proposed polar mechanical metamaterial introduces a novel design concept applicable to signal transmission, isolation, and energy absorption for different load levels.

极性是指物体在相反的方向上表现出相反的内在特性的现象，在机械二极管、机械逻辑门和冲击保护等各个领域中发挥着基础作用。本文提出了一种基于鱼骨状结构的具有极性和双重变形特性的新型机械超材料，使给定的表面结构坚硬，而其相对面柔软，同时还能够适应软表面不同负载水平的任务边。机械超材料显示出双应力平台，并且在相对两侧加载时表现出显着的机械响应差异。通过数值模拟，识别了机械超材料的极性特征谱。通过数值模拟和实验验证了利用欧拉不稳定理论预测的软边界应力平台。定义负载差的无量纲参数来评估极性机械超材料的极性特性，并通过讨论几何参数的影响，为实现极性机械超材料的显着极性特性提供设计指南。所提出的极性机械超材料引入了一种新颖的设计理念，适用于不同负载水平的信号传输、隔离和能量吸收。