Transparent Structures with a Fast De-Stiffening Functionality
Transparent Structures with a Fast De-Stiffening Functionality
复制标题
具有快速去刚度功能的透明结构
DOI：
10.1002/adem.202301691
复制
发表时间：
2024
影响因子：
3.6
通讯作者：
Qiang D
中科院分区：
文献类型：
--
作者：
Qiang D
大多数自然生物体与环境相互作用时具有一定程度的机械适应性，使它们能够执行各种任务并适应不断变化的环境。然而，人造结构缺乏这种多功能性，通常是为了满足一定的承载要求而设计的。这会导致性能、效率和安全性方面的限制。本文的目的是在不影响承载能力的情况下，展示传统结构响应的快速去刚度。这是通过使用互连的纳米结构金属网络开发活性界面来实现的。在 4.8 V 激励下，加热速率非常快，平均约为 45 °C s−1，同时保持 67% 的透明度。热塑性基体中嵌入的金属网络已被用作传统透明多层结构中的活性界面。激活后，它提供快速（即激活后 2 秒）机械去硬化能力。有限元建模的结果与实验结果非常吻合。这里演示的快速可逆刚度调节可以在各种多层结构中实现，在机器人、变形和可展开结构、主动阻尼和主动冲击安全系统中具有广泛的应用。
The majority of natural organisms interact with their environments with a degree of mechanical adaptability that allows them to carry out a variety of tasks and adapt to changing circumstances. Human‐made structures, however, lack this versatility and are normally designed to fulfill a certain load‐carrying requirement. This causes limitations in performance, efficiency, and safety. The aim of this article is to present rapid de‐stiffening in the response of conventional structures, without compromising the load‐bearing capacity. This has been achieved by developing an active interface using an interconnected nanostructured metallic network. A very fast heating rate with an average of ≈45 °C s−1under 4.8 V excitation while retaining transparency of 67% is demonstrated. The embedded metallic network in a thermoplastic matrix has been deployed as an active interface, in a conventional transparent multilayered structure. Upon activation, it provides a rapid (i.e., 2 s after activation) mechanical de‐stiffening capability. The results from finite element modeling have been found to be in good agreements with those from experiments. The rapid reversible stiffness tuning demonstrated here can be implemented in variety of multilayered structures with a wide range of applications in robotics, morphing and deployable structures, active damping, and active impact safety systems.