Healable, memorizable, and transformable lattice structures made of stiff polymers
Healable, memorizable, and transformable lattice structures made of stiff polymers
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DOI：
10.1038/s41427-020-0208-9
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发表时间：
2020-03
影响因子：
9.7
通讯作者：
Kunhao Yu;Haixu Du;A. Xin;Kyung Hoon Lee;Zhangzhengrong Feng;S. Masri;Yong Chen;Guoliang Huang;Qiming Wang
中科院分区：
文献类型：
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作者：
Kunhao Yu;Haixu Du;A. Xin;Kyung Hoon Lee;Zhangzhengrong Feng;S. Masri;Yong Chen;Guoliang Huang;Qiming Wang
新兴的可变形晶格结构提供了有前途的范例，可逆地切换晶格配置，从而使其性能能够根据需要进行调整。现有的相变机制仅限于非断裂变形，如折纸，不稳定性，形状记忆和液晶性。在这项研究中，我们提出了一类可变形的晶格结构，使骨折和形状记忆辅助愈合。晶格结构是用分子设计的光聚合物增材制造的，该光聚合物能够实现骨折愈合和形状记忆。我们发现，具有不同体积分数的3D结构的晶格结构可以愈合骨折，并在两到十个愈合周期内完全恢复刚度和强度。此外，与形状记忆效应相结合，网格结构可以恢复与变形相关的变形，然后愈合断裂界面，从而能够愈合网格翼损伤、模式I断裂、凹痕引起的碰撞和异物撞击。此外，通过利用骨折和形状记忆辅助愈合的耦合，我们展示了晶格结构的可逆配置转换，以实现不同刚度，振动透射率和声学反射的属性状态之间的切换。这些可愈合的、可记忆的和可变形的晶格结构可以在下一代飞机面板、汽车框架、防弹衣、冲击缓解器、振动阻尼器和声学调制器中找到广泛的应用。
Emerging transformable lattice structures provide promising paradigms to reversibly switch lattice configurations, thereby enabling their properties to be tuned on demand. The existing transformation mechanisms are limited to nonfracture deformation, such as origami, instability, shape memory, and liquid crystallinity. In this study, we present a class of transformable lattice structures enabled by fracture and shape-memory-assisted healing. The lattice structures are additively manufactured with a molecularly designed photopolymer capable of both fracture healing and shape memory. We show that 3D-architected lattice structures with various volume fractions can heal fractures and fully restore stiffness and strength over two to ten healing cycles. In addition, coupled with the shape-memory effect, the lattice structures can recover fracture-associated distortion and then heal fracture interfaces, thereby enabling healing of lattice wing damages, mode-I fractures, dent-induced crashes, and foreign-object impacts. Moreover, by harnessing the coupling of fracture and shape-memory-assisted healing, we demonstrate reversible configuration transformations of lattice structures to enable switching among property states of different stiffnesses, vibration transmittances, and acoustic absorptions. These healable, memorizable, and transformable lattice structures may find broad applications in next-generation aircraft panels, automobile frames, body armor, impact mitigators, vibration dampers, and acoustic modulators.