Due to its real-time control, high folding ratio, and structure self-locking, flexible large curvature self-folding devices have broad application prospects, such as foldable human implants, flexible electronics, and flexible robots. Driven by this background, flexible large curvature folding butterfly (Polyura eudamippus) proboscises were studied in this work. The folding ratio of the proboscises was about 15. The curvature of coiled proboscises ranged from about 150 m⁻¹ to 880 m⁻¹. The external and internal structures of the proboscises were studied by different methods. Three main strategies for large-curvature folding of proboscises were identified: a gradual decrease in thickness, a lower elastic modulus, and (most importantly) large numbers of regular corrugated cracks arranged on the surface. These corrugated cracks can effectively accommodate the coiled strain and provide space for the large curvature folding of proboscises. Finally, a 4D printed coiled sample with corrugated cracks was fabricated to mimic the proboscises stretching process. Large-curvature folding strategies, based on these proboscises, provide insights for the biomimetic design of artificial highly folded components.

由于其实时控制，高折叠率和结构自锁性，柔性大曲率自折叠装置具有广阔的应用前景，如可折叠人体植入物，柔性电子器件和柔性机器人。在这种背景下，这项工作研究了柔性大曲率折叠蝴蝶（Polyura eudamippus）长鼻。长鼻角的折叠率约为15。长鼻角的曲率在约150 m ^-1至880 m ^{-1的范围内。}。用不同的方法研究了长鼻的外部和内部结构。确定了长鼻弯曲的三个主要策略：厚度逐渐减小，弹性模量降低以及（最重要的是）在表面排列的大量规则波纹状裂纹。这些波纹状裂纹可以有效地适应盘绕的应变，并为长齿的大曲率折叠提供空间。最终，制造出具有波纹状裂纹的4D打印卷曲样品，以模仿长吻口的拉伸过程。基于这些口号的大曲率折叠策略为人工高度折叠的组件的仿生设计提供了见识。