Topology and Toughening of Sparse Elastic Networks
Topology and Toughening of Sparse Elastic Networks
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稀疏弹性网络的拓扑和增韧
DOI：
10.1103/physrevlett.124.068002
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发表时间：
2020
影响因子：
8.6
通讯作者：
Sawae Yoshinori
中科院分区：
文献类型：
--
作者：
Yamaguchi Tetsuo;Onoue Yudai;Sawae Yoshinori
稀疏弹性网络（例如水凝胶、泡沫或网状物）的增韧以抵抗断裂是材料科学中最重要的问题之一。然而，尽管迫切的工程需求和材料科学家的努力，增韧原理尚未确立。在这里，我们通过关注网络拓扑来解决上述问题。我们对由橡胶绳和具有明确拓扑结构的连接器制成的二维周期晶格进行断裂实验。我们发现，在保持平均配位数（）恒定的同时系统地增加最大配位数会导致韧性的显着提高。我们通过数值模拟重现了观察到的增韧行为，并确认裂纹尖端附近的应力集中可以通过网络的拓扑结构进行控制。这为创建坚韧的稀疏弹性网络（尤其是水凝胶）提供了一种新策略。
The toughening of sparse elastic networks, such as hydrogels, foams, or meshes against fracture is one of the most important problems in materials science. However, the principles of toughening have not yet been established despite urgent engineering requirements and several efforts made by materials scientists. Here we address the above-mentioned problem by focusing on the topology of a network. We perform fracture experiments for two-dimensional periodic lattices fabricated from rubber strings and connecters with well-defined topological structures. We find that systematic increase in the largest coordination number while maintaining the average coordination number () as constant leads to significant improvement in toughness. We reproduce the observed toughening behavior through numerical simulations and confirm that the stress concentration in the vicinity of a crack tip can be controlled by the topology of the network. This provides a new strategy for creating tough sparse elastic networks, especially hydrogels.