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| Study on 4D Printing and Deformations of Bionic Light Response Shape Memory Materials |
| LIU Chunbao1, 2, XU Hui1, 2, LIANG Yunhong2, ZHANG Lan2, LIN Zhaohua1 |
1. School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, China;
2. Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China) |
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Abstract For the advanced scientific research in extreme environments such as deep space, deep sea, deep earth and polar, the material-structure-functional integrated additive manufacturing for fabricating intelligent components, that is, 4D printing technology was used. The multilayer grid structure of wood was treated as bionic model. The polylactic acid, polycaprolactone, and graphene oxide were treated as the matrix, adding phase and light conversion agents. The bionic smart material with light-responsive shape memory properties was prepared via 3D printing technology of direct writing. The response mode, deformation process, mechanical strength, and deformation temperature of the smart material were researched. The results show that the bionic smart material can return to its original shape in response to light or temperature. The temperature of deformation is lowered to around 55 ℃. Under the near-infrared light response, shape fixed rate is as high as 96%, shape recovery rate is 93%, and the fastest shape recovery time is 9 s. Finally, the application to the bionic deployable structure and the optical response cladding release device were demonstrated, which can achieve light-driven deployment on demand and controlled sequential release functions. It provided an effective bionic new thought and method for solving the problems of accurate selection, remote control, and rapid response in aerospace deformable structures.
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