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Bio-Design and Manufacturing  2022 Vol.5 No.1 P.189-200

http://doi.org/10.1007/s42242-021-00146-3


Layout design and application of 4D-printing bio-inspired structures with programmable actuators


Author(s):  Siyuan Zeng, Yixiong Feng, Yicong Gao, Hao Zheng & Jianrong Tan

Affiliation(s):  State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, 310027, China; more

Corresponding email(s):   gaoyicong@zju.edu.cn, haozheng@zju.edu.cn

Key Words:  Bio-inspired structure, Layout design, Programmable actuators, Bilayer structure, 4D printing


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Siyuan Zeng, Yixiong Feng, Yicong Gao, Hao Zheng & Jianrong Tan . Layout design and application of 4D-printing bio-inspired structures with programmable actuators[J]. Journal of Zhejiang University Science D, 2022, 5(1): 189-200.

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author="Siyuan Zeng, Yixiong Feng, Yicong Gao, Hao Zheng & Jianrong Tan ",
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doi="10.1007/s42242-021-00146-3"
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Abstract: 
Four-dimensional (4D) printing is an advanced form of three-dimensional (3D) printing with controllable and programmable shape transformation over time. Actuators are used as a controlling factor with multi-stage shape recovery, with emerging opportunities to customize the mechanical properties of bio-inspired structures. The print pattern of shape memory polymer (SMP) fibers strongly affects the achievable resolution, and consequently influences several other physical and mechanical properties of fabricated actuators. However, the deformations of bio-inspired structures due to actuator layout are more complex because of the presence of the coupling of multi-directional strain. In this study, the initial structure was designed from closed-shell behavior and divided into a general unit and actuator unit, the latter responsible for driving the transformation. Mutual stress confrontation between the actuator and the general unit was considered in the layout thermodynamic model, in order to eliminate the transformation produced by the uncontrolled shape memory behavior of the general unit. Three critical and effective strategies for the layout design of actuators were proposed and then applied to achieve the desired accurate deformation of 3D-printed bilayer structures. Finally, the proposed approach was validated and adopted for fabricating a complex shell-like gripper structure.

浙江大学曾思远、冯毅雄、高一聪等 | 基于可编辑激发器的4D打印生物启发结构布局设计及应用

本研究论文聚焦基于可编辑激发器的4D打印生物启发结构布局设计及应用。4D打印是三维(3D)打印的高级应用形式,其随着时间的推移具有可控和可编程的形状变换。激发器被用作具有多级形状恢复的控制因素,并可实现仿生结构的动态机械性能。通过对形状记忆聚合物纤维的印刷工艺进行改变,可以影响制造的激发器的物理性能和机械性能。然而,由于存在多向应变的耦合,激发器布局引起的结构变形将更加复杂。本文根据贝壳的闭壳行为设计了仿生结构,分为通用单元和激发器单元,后者负责驱动转换。在布局热力学模型中考虑了激发器与通用单元之间的相互应力对抗,以消除通用单元不受控制的形状记忆行为所产生的转变。文章提出了激发器布局设计的三种关键且有效的策略,然后将其应用于实现3D打印双层结构所需的精确变形。最后,所提出的方法被验证并用于制造复杂的壳状夹持器结构。

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