Spatiotemporally Programmable Surfaces via Viscoelastic Shell Snapping
Spatiotemporally Programmable Surfaces via Viscoelastic Shell Snapping
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DOI：
10.1002/aisy.202100270
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发表时间：
2022-05-29
影响因子：
7.4
通讯作者：
Jin, Lihua
中科院分区：
文献类型：
--
作者：
Chen, Yuzhen;Liu, Tianzhen;Jin, Lihua
许多物种可以动态地改变它们的皮肤纹理，以提高它们的运动性和生存能力。尽管在设计具有可调表面纹理的生物启发材料方面做出了巨大努力，但在没有复杂控制的情况下开发时空可编程和可重构纹理变形仍然具有挑战性。在这里，提出了一种设计策略，以实现这些属性的表面。表面包括具有广泛定制的时间响应的单位单元的阵列。通过不同地布置单位单元，表面可以表现出各种时空响应，这可以通过拆卸和重新布置单位单元来容易地重新配置。具体地说，采用粘弹性壳作为单胞，它可以被驱动到一个凹陷的状态，并恢复到初始的凸状态后，一段时间的负载删除。计算和实验表明，恢复时间可以广泛调谐的几何形状和材料的粘弹性的外壳。通过组装具有不同恢复时间的壳，在简单的气动驱动下构建具有预编程时空纹理变形的表面，并展示了图案的时间演化，例如数字和表情符号，以及摩擦的时空控制。这项工作开辟了新的途径，在设计时空变形表面，可用于编程的机械，光学和电气性能。这篇文章的预印本可以在https://www.authorea.com/doi/full/10.22541/au.164020946.62560710上找到。
Many species can dynamically alter their skin textures to enhance their motility and survivability. Despite the enormous efforts on designing bio-inspired materials with tunable surface textures, developing spatiotemporally programmable and reconfigurable textural morphing without complex control remains challenging. Herein, a design strategy is proposed to achieve surfaces with such properties. The surfaces comprise an array of unit cells with broadly tailored temporal responses. By arranging the unit cells differently, the surfaces can exhibit various spatiotemporal responses, which can be easily reconfigured by disassembling and rearranging the unit cells. Specifically, viscoelastic shells as the unit cells is adopted, which can be pneumatically actuated to a concave state, and recover the initial convex state sometime after the load is removed. It is shown computationally and experimentally that the recovery time can be widely tuned by the geometry and material viscoelasticity of the shells. By assembling such shells with different recovery times, surfaces with pre-programmed spatiotemporal textural morphing under simple pneumatic actuation is built, and temporal evolution of patterns, such as digit numbers and emoji, and spatiotemporal control of friction are demonstrated. This work opens up new avenues in designing spatiotemporal morphing surfaces that could be employed for programming mechanical, optical, and electrical properties. A preprint version of the article can be found at: https://www.authorea.com/doi/full/10.22541/au.164020946.62560710.