软凝胶中的网络拓扑：硬化和软化材料
Network topology in soft gels: hardening and softening materials
摘要：
软凝胶的结构复杂性是通用机械响应的起源，该响应允许在相同材料中的大变形、受控弹性恢复和韧性。利用这种材料的潜力的一个限制是对本体机械性能的微观结构起源的基本理解不足。在这里，我们调查的作用，网络拓扑结构在模型凝胶通过3D数值模拟。我们的研究将空间网络组织的拓扑结构与屈服和损伤前的非线性流变响应联系起来：我们的分析阐明了如何单独使用网络连接来修改大应变下的凝胶力学，从应变软化到硬化，甚至到脆性响应。这些发现为智能材料设计和理解潜在的广泛的技术相关材料的非平凡的机械响应提供了新的见解。
英文摘要：
The structural complexity of soft gels is at the origin of a versatile mechanical response that allows for large deformations, controlled elastic recovery and toughness in the same material. A limit to exploiting the potential of such materials is the insufficient fundamental understanding of the microstructural origin of the bulk mechanical properties. Here we investigate the role of the network topology in a model gel through 3D numerical simulations. Our study links the topology of the network organization in space to its non-linear rheological response preceding yielding and damage: our analysis elucidates how the network connectivity alone could be used to modify the gel mechanics at large strains, from strain-softening to hardening and even to a brittle response. These findings provide new insight for smart material design and for understanding the non-trivial mechanical response of a potentially wide range of technologically relevant materials.
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