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Tunable energy trapping through contact-induced snap-through buckling in strips with programmable imperfections
Extreme Mechanics Letters ( IF 4.7 ) Pub Date : 2020-04-11 , DOI: 10.1016/j.eml.2020.100732
Zhiwei Zhang , Simon Pusateri , Binglin Xie , Nan Hu

The concept of energy trapping has been recently demonstrated in modular architected materials at various length scales but most energy-trapping mechanisms retain its deformed shape and requires external loads to recover their initial states. Here, we demonstrated an on-demand, repeatable energy-trapping mechanism that enabled by interaction of buckled slender elements. Guided by experiments and numerical simulations, we proved that using a pre-defined imperfection on thin strips can generate a predictable and controllable element interaction, resulting trapped energy stored in the elements and a rapid energy release in a form of snap-through buckling. The amount of trapped energy can be tailored by changing imperfection design, imperfection amplitude, spacing between element and assembly of multiple components. The robustness of this mechanism is demonstrated by such a purely geometric design and thus can be applied over a range of scales and using different materials. We envision that the proposed mechanism can be integrated into buckling-induced smart devices such as energy harvesters and dampers.



中文翻译:

通过带可编程缺陷的带材中的接触感应快速弯曲屈曲可调节的能量陷阱

能量捕获的概念最近已在各种长度尺度的模块化架构材料中得到了证明,但是大多数能量捕获机制都保持其变形的形状,并需要外部负载来恢复其初始状态。在这里,我们展示了一种按需的,可重复的能量陷阱机制,该机制可以通过带扣细长元素的相互作用来实现。在实验和数值模拟的指导下,我们证明了在薄带上使用预定义的缺陷可以生成可预测和可控制的元素相互作用,从而导致捕获的能量存储在元素中,并以扣紧屈曲的形式快速释放能量。可以通过更改缺陷设计,缺陷幅度,元件之间的间距以及多个组件的装配来调整捕获的能量量。这种纯粹的几何设计证明了这种机制的坚固性,因此可以在各种比例尺上使用不同的材料进行应用。我们设想,所提出的机制可以集成到屈曲感应的智能设备中,例如能量收集器和阻尼器。

更新日期:2020-04-11
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