Wickeler Anastasia L, McLellan Kyra, Sun Yu-Chen, Naguib Hani E
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada.
Department of Materials Science and Engineering, University of Toronto, Toronto, ON, Canada.
J Intell Mater Syst Struct. 2023 Dec;34(20):2379-2392. doi: 10.1177/1045389X231181940. Epub 2023 Jun 21.
Applying tessellated origami patterns to the design of mechanical materials can enhance properties such as strength-to-weight ratio and impact absorption ability. Another advantage is the predictability of the deformation mechanics since origami materials typically deform through the folding and unfolding of their creases. This work focuses on creating 4D printed flexible tubular origami based on three different origami patterns: the accordion, the Kresling and the Yoshimura origami patterns, fabricated with a flexible polylactic acid (PLA) filament with heat-activated shape memory effect. The shape memory characteristics of the self-unfolding structures were then harnessed at 60°C, 75°C and 90°C. Due to differences in the folding patterns of each origami design, significant differences in behaviour were observed during shape programming and actuation. Among the three patterns, the accordion proved to be the most effective for actuation as the overall structure can be compressed following the folding crease lines. In comparison, the Kresling pattern exhibited cracking at crease locations during deformation, while the Yoshimura pattern buckled and did not fold as expected at the crease lines. To demonstrate a potential application, an accordion-patterned origami 4D printed tube for use in hand rehabilitation devices was designed and tested as a proof-of-concept prototype incorporating self-unfolding origami.
将镶嵌折纸图案应用于机械材料的设计可以提高诸如强度重量比和冲击吸收能力等性能。另一个优点是变形力学的可预测性，因为折纸材料通常通过其折痕的折叠和展开来变形。这项工作专注于基于三种不同的折纸图案创建4D打印的柔性管状折纸：手风琴式、克雷斯林式和吉村式折纸图案，采用具有热激活形状记忆效应的柔性聚乳酸（PLA）长丝制造。然后在60°C、75°C和90°C下利用自展开结构的形状记忆特性。由于每种折纸设计的折叠模式不同，在形状编程和驱动过程中观察到了行为上的显著差异。在这三种图案中，手风琴式被证明是最有效的驱动方式，因为整个结构可以沿着折叠折线压缩。相比之下，克雷斯林图案在变形过程中折痕位置出现开裂，而吉村图案在折痕线处发生屈曲且未按预期折叠。为了展示潜在应用，设计并测试了一种用于手部康复设备的手风琴式图案4D打印折纸管，作为包含自展开折纸的概念验证原型。
