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arXiv 2204.01375cond-mat.soft
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粘弹性超材料的极端力学

The Extreme Mechanics of Viscoelastic Metamaterials

David M. J. Dykstra, Shahram Janbaz, Corentin Coulais

AI总结:

本文综述了柔性超材料中力学失稳与粘弹性耗散的相互作用,揭示其对屈曲和突跳型动态行为的关键作用,并提出通过粘弹性空间图案化实现加载速率相关的新型超材料设计。

摘要:

由柔性构建单元制成的力学超材料可以展现出丰富的极端力学响应,例如负弹性常数、形状变化、可编程性和记忆性。迄今为止,对于这类柔性超材料,耗散在很大程度上仍被忽视。事实上,人们往往在组成材料的选择上投入大量精力以避免强耗散效应。然而,在越来越多的动态加载超材料场景中,耗散不可忽略。在这篇综述中,我们表明力学失稳与粘弹性之间的相互作用可能至关重要,并且可以被利用来获得新的功能。我们首先展示这种相互作用是理解柔性耗散超材料动力学行为的关键,这些超材料利用屈曲和突跳作为功能机制。我们进一步讨论了粘弹性质的空间图案化为设计具有依赖于加载速率的力学性能的超材料所提供的新机遇。

英文摘要:

Mechanical metamaterials made of flexible building blocks can exhibit a plethora of extreme mechanical responses, such as negative elastic constants, shape-changes, programmability and memory. To date, dissipation has largely remained overlooked for such flexible metamaterials. As a matter of fact, extensive care has often been devoted in the constitutive materials' choice to avoid strong dissipative effects. However, in an increasing number of scenarios, where metamaterials are loaded dynamically, dissipation can not be ignored. In this review, we show that the interplay between mechanical instabilities and viscoelasticity can be crucial and can be harnessed to obtain new functionalities. We first show that this interplay is key to understanding the dynamical behaviour of flexible dissipative metamaterials that use buckling and snapping as functional mechanisms. We further discuss the new opportunities that spatial patterning of viscoelastic properties offer for the design of mechanical metamaterials with properties that depend on loading rate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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