通过多稳态实现刚度切换
Toggling stiffness via multistability
AI总结：
本研究提出一种多稳态机械超材料，通过结构设计实现离散可切换的剪切刚度，并利用支撑梁旋转传递机制调节刚度比，实验验证后应用于可编程软离合器，为软体机器人等提供自适应轻量化设计策略。
摘要：
机械超材料通过结构设计而非材料组成，能够实现非常规且可编程的机械响应。在本工作中，我们引入了一种具有可切换刚度效应的多稳态机械超材料，其有效剪切刚度在稳定构型之间离散切换。对单胞替代梁模型的力学分析表明，这种行为源于支撑梁传递给曲梁的旋转，该旋转控制了弯曲与轴向变形之间的平衡。单胞两种状态之间的刚度比可通过改变支撑梁的细长度或引入调节旋转传递的局部铰链来调节。在3D打印原型上的实验验证了数值预测，确认了不同几何形状下刚度切换的一致性。最后，我们展示了一种利用该效应实现可编程、阶梯式刚度调节的整体式软离合器。这项工作为利用多稳态超材料实现可切换刚度建立了一种设计策略，为软体机器人和智能结构中的自适应、轻量化和自主系统铺平了道路。
英文摘要：
Mechanical metamaterials enable unconventional and programmable mechanical responses through structural design rather than material composition. In this work, we introduce a multistable mechanical metamaterial that exhibits a toggleable stiffness effect, where the effective shear stiffness switches discretely between stable configurations. The mechanical analysis of surrogate beam models of the unit cell reveal that this behavior originates from the rotation transmitted by the support beams to the curved beam, which governs the balance between bending and axial deformation. The stiffness ratio between the two states of the unit cell can be tuned by varying the slenderness of the support beams or by incorporating localized hinges that modulate rotational transfer. Experiments on 3D-printed prototypes validate the numerical predictions, confirming consistent stiffness toggling across different geometries. Finally, we demonstrate a monolithic soft clutch that leverages this effect to achieve programmable, stepwise stiffness modulation. This work establishes a design strategy for toggleable stiffness using multistable metamaterials, paving the way for adaptive, lightweight, and autonomous systems in soft robotics and smart structures.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
