Li Jiacong, Bao Jiali, Ho Chengyeh, Li Shuguang, Xu Jing
Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China.
Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control, Tsinghua University, Beijing, 100084, China.
Adv Sci (Weinh). 2024 Sep;11(36):e2402128. doi: 10.1002/advs.202402128. Epub 2024 Jul 31.
Artificial morphing surfaces, inspired by the high adaptability of biological tissues, have emerged as a significant area of research in recent years. However, the practical applications of these surfaces, constructed from soft materials, are considerably limited due to their low shear stiffness. Rigid-foldable cylinders are anisotropic structures that exhibit high adaptability and shear stiffness. Thus, they have the potential to address this issue. However, changes in shape and area at both ends during folding can lead to collisions or gaps on the morphing surface. Here, a quasi-rigid-foldable (QRF) rate is first introduced to quantify the rigid-foldability of a foldable structure and validate it through experiments. More importantly, a QRF polyhedron is then proposed, which is not only notably anisotropic, similar to a rigid-foldable cylinder, but also exhibits a zero-Poisson's ratio property, making it suitable for arraying as morphing surfaces without any collisions or gaps. Such surfaces have a myriad of applications, including modulating electromagnetic waves, gripping fragile objects, and serving as soles for climbing robots.
受生物组织高适应性启发的人工变形表面，近年来已成为一个重要的研究领域。然而，这些由软材料构建的表面，由于其低剪切刚度，实际应用受到很大限制。刚性可折叠圆柱体是具有高适应性和剪切刚度的各向异性结构。因此，它们有潜力解决这个问题。然而，折叠过程中两端形状和面积的变化会导致变形表面上出现碰撞或间隙。在此，首先引入准刚性可折叠（QRF）率来量化可折叠结构的刚性可折叠性，并通过实验进行验证。更重要的是，随后提出了一种QRF多面体，它不仅与刚性可折叠圆柱体一样具有显著的各向异性，而且还具有零泊松比特性，使其适合排列成变形表面而不会出现任何碰撞或间隙。这样的表面有无数应用，包括调制电磁波、抓取易碎物体以及用作攀爬机器人的鞋底。
