Inspired by the origami, a series of smart circular structures with large folding ratio was designed and fabricated by four-dimensional printing in this article. The structure consists of the crease and plate parts by embedding the Miura-ori into a folding fan, and has the characteristics of bi-stable states and self-deployment by introducing soft and hard shape memory polymers. The shape memory polymer material parameters were obtained by the dynamic-mechanical analyzer, and then the constitutive equation can be determined. To demonstrate the folding and deployment performance of the smart structures, the experiment and finite element simulation was carried out. It is shown that the structures can repeatedly be folded and deployed by temperature-controlled shape memory effect of shape memory polymer. This design can be applied to the large-scale and multiple level smart structures such as antennas and deployable solar sails.

中文翻译：

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受折纸启发的具有大折叠比的四维打印自展开圆形结构

受折纸的启发，本文通过四维打印设计并制作了一系列大折叠比的智能圆形结构。该结构由折痕部分和板部分组成，将Miura-ori嵌入折扇中，并通过引入软硬形状记忆聚合物具有双稳态和自展开特性。通过动态力学分析仪获得形状记忆聚合物材料参数，进而确定本构方程。为了展示智能结构的折叠和展开性能，进行了实验和有限元模拟。结果表明，该结构可以通过形状记忆聚合物的温度控制形状记忆效应反复折叠和展开。