Design of Bistable Soft Deployable Structures via a Kirigami‐Inspired Planar Fabrication Approach
Design of Bistable Soft Deployable Structures via a Kirigami‐Inspired Planar Fabrication Approach
复制标题
DOI：
10.1002/admt.202300088
复制
发表时间：
2023-01
影响因子：
6.8
通讯作者：
Mrunmayi Mungekar;Leixin Ma;Wenzhong Yan;Vishal Kackar;Shyan Shokrazadeh;M. Jawed
中科院分区：
文献类型：
--
作者：
Mrunmayi Mungekar;Leixin Ma;Wenzhong Yan;Vishal Kackar;Shyan Shokrazadeh;M. Jawed
全软双稳态机构已在软机器人、可穿戴设备、医疗工具以及能量收集等领域展现出广泛应用。然而，由于缺乏简便且具有潜在可扩展性的设计与制造方法，其进一步融入主流应用受到了限制。在此，我们提出一种自上而下的平面方法，即将受剪纸艺术启发的工程设计与预拉伸工艺相结合。利用该方法，以平面方式制作出 “剪纸 - 预拉伸基底 - 剪纸” 三层前驱体；释放后，由于基底的预拉伸，各层之间的应变失配将引发面外屈曲，从而实现目标三维双稳态结构。通过结合实验表征、解析建模和有限元模拟，探究了剪纸层图案尺寸和预拉伸对所得三维复合材料几何形状与稳定性的影响。此外，还对实现任意形状软双稳态结构以及多稳态配置软复合材料的方法进行了研究，这有望推动其更多应用。我们通过使用双稳态软剪纸复合材料构建两款软机器来展示该方法：（i）一种双稳态软抓手，能够轻柔抓取不同形状和尺寸的易碎物体；（ii）一种受捕蝇草启发的机器人，可自主检测并捕获物体。
Fully soft bistable mechanisms have shown extensive applications ranging from soft robotics, wearable devices, and medical tools, to energy harvesting. However, the lack of design and fabrication methods that are easy and potentially scalable limits their further adoption into mainstream applications. Herein, a top–down planar approach is presented by introducing Kirigami‐inspired engineering combined with a pre‐stretching process. Using this method, Kirigami‐Pre‐stretched Substrate‐Kirigami trilayered precursors are created in a planar manner; upon release, the strain mismatch—due to the pre‐stretching of substrate—between layers will induce an out‐of‐plane buckling to achieve targeted 3D bistable structures. By combining experimental characterization, analytical modeling, and finite element simulation, the effect of the pattern size of Kirigami layers and pre‐stretching on the geometry and stability of resulting 3D composites is explored. In addition, methods to realize soft bistable structures with arbitrary shapes and soft composites with multistable configurations are investigated, which may encourage further applications. This method is demonstrated by using bistable soft Kirigami composites to construct two soft machines: (i) a bistable soft gripper that can gently grasp delicate objects with different shapes and sizes and (ii) a flytrap‐inspired robot that can autonomously detect and capture objects.