Residual Stress‐Driven Non‐Euclidean Morphing in Origami Structures

• Published in: Advanced intelligent systems 2024-12, Vol.6 (12), p.n/a
• Main Authors: Liang, Zihe, Chai, Sibo, Ding, Qinyun, Xiao, Kai, Liu, Ke, Ma, Jiayao, Ju, Jaehyung
• Format: Article
• Language: English
• Subjects: 3-D printers; 4D printing; active origami; Additive manufacturing; Deformation; Euclidean space; Extrusion; Formability; instabilities; Locking; Martensitic transformations; Morphing; panel deformations; Panels; Residual stress; Shape memory; shape memory effects; Three dimensional printing; Topology
• ISSN: 2640-4567; 2640-4567
• DOI: 10.1002/aisy.202400246

Morphing origami has numerous potential engineering applications owing to its intrinsic morphing features from 2D planes to 3D surfaces. However, the current 1D hinge deformation‐driven transformation of foldable origami with rigid or slightly deformable panels cannot achieve a 3D complex and large curvilinear morphing. Moreover, most active origami structures use thin hinges with soft materials on their creases, thus resulting in a lower load capability. This study proposes a novel origami morphing method demonstrating large free‐form surface morphing, such as Euclidean to non‐Euclidean surface morphing with shape‐locking. Tensorial anisotropic stress in origami panels is embedded during the extrusion‐based 3D printing of shape memory polymers. The extrusion‐based 3D printing of isotropic SMPs can produce tensorial anisotropic stress in origami panels during fabrication, which can realize significant non‐Euclidean surface morphing with multiple deformation modes. The connecting topology of the origami unit cells influences the global morphing behavior owing to the interaction of the deformation of adjacent panels. Non‐Euclidean morphing integrated with 4D printing can provide multimodal shape locking at material and structural levels. This study proposes a novel origami morphing method with panel deformation‐driven thermal actuation. An extrusion‐based 3D printing of isotropic shape memory polymers can produce tensorial anisotropic stress in origami panels during fabrication. This can realize significant non‐Euclidean surface morphing with multiple deformation modes and shape locking. This method surpasses traditional hinge‐actuated origami, enabling expansive free‐form shaping and enhanced structural support.