Stress focusing and damage protection in topological Maxwell metamaterials
Stress focusing and damage protection in topological Maxwell metamaterials
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拓扑麦克斯韦超材料中的应力集中和损伤保护
DOI：
10.1016/j.ijsolstr.2023.112268
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发表时间：
2023
影响因子：
3.6
通讯作者：
Gonella, Stefano
中科院分区：
文献类型：
--
作者：
Widstrand, Caleb;Hu, Chen;Mao, Xiaoming;Labuz, Joseph;Gonella, Stefano
拓扑力学领域的进展突出了麦克斯韦晶格的一些特殊的力学性质，包括聚焦零能软模和自应力状态(SSS)在其边缘和界面的能力。由于它们的拓扑特性，这些现象受到保护，不受晶格几何和材料性质的扰动，这使得它们对结构非理想、缺陷和损伤的出现具有很强的抵抗力。最近的计算工作表明，可以利用Maxwell晶格将应力集中在指定的SSS域壁上的能力，以保护晶格中的其他区域免受有害的应力集中，并潜在地抑制应力热点(如孔洞和裂缝)处的断裂机制的开始。这一特性为设计抗损伤和抗断裂的晶格配置提供了一个强大的、基于几何的工具。在这项工作中，我们在以非理想、有限厚度铰链为特征的现实结构网格的背景下，提供了一个全面的实验驱动的探索。我们的实验记录了显著的磁区壁应力集中的开始，表明即使在结构铰链的稀释效应存在的情况下，极化也具有显著的稳健性。我们还证明，极化保护晶格免受缺陷铰链和整体裂纹的潜在破坏。最后，我们从数值上说明了SSS域壁与其他普通形式的增强材料相比的优越性。
Advances in the field of topological mechanics have highlighted a number of special mechanical properties of Maxwell lattices, including the ability to focus zero-energy floppy modes and states of self-stress (SSS) at their edges and interfaces. Due to their topological character, these phenomena are protected against perturbations in the lattice geometry and material properties, which makes them robust against the emergence of structural non-idealities, defects, and damage. Recent computational work has shown that the ability of Maxwell lattices to focus stress along prescribed SSS domain walls can be harnessed for the purpose of protecting other regions in the bulk of the lattice from detrimental stress concentration and, potentially, inhibiting the onset of fracture mechanisms at stress hot spots such as holes and cracks. This property provides a powerful, geometry-based tool for the design of lattice configurations that are robust against damage and fracture. In this work, we provide a comprehensive experiment-driven exploration of this idea in the context of realistic structural lattices characterized by non-ideal, finite-thickness hinges. Our experiments document the onset of pronounced domain wall stress focusing, indicating a remarkable robustness of the polarization even in the presence of the dilutive effects of the structural hinges. We also demonstrate that the polarization protects the lattice against potential failure from defected hinges and cracks in the bulk. Finally, we illustrate numerically the superiority of SSS domain walls compared to other trivial forms of reinforcements.
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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