多孔弹性复合材料水力断裂中的并发因素决定增韧
Concurrent factors determine toughening in the hydraulic fracture of poroelastic composites
摘要：
脆性材料会发生灾难性的失效。由于其有限的抗弯容限，失效通过局部断裂发生，并且通常是动态过程。最近，对上皮细胞单层的实验表明，当易破裂的材料粘附到水凝胶基底上时，这种情况可以被显著改变。由于脆性层和多孔弹性基底之间的水力耦合，这种复合材料可以发展依赖于多个裂纹同时生长的增韧机制。在这里，我们通过一个详细的模型来研究这种显着的行为，并探讨如何在确定系统的宏观韧性的材料和加载参数一致。通过扩展以前的研究，我们的研究结果表明，快速加载通过促进分布裂纹传递材料韧性。此外，我们的理论研究结果可能会建议创新的结构，具有更高的韧性，对腐蚀不敏感的材料。
英文摘要：
Brittle materials fail catastrophically. In consequence of their limited flaw-tolerance, failure occurs by localized fracture and is typically a dynamic process. Recently, experiments on epithelial cell monolayers have revealed that this scenario can be significantly modified when the material susceptible to cracking is adhered to a hydrogel substrate. Thanks to the hydraulic coupling between the brittle layer and the poroelastic substrate, such a composite can develop a toughening mechanism that relies on the simultaneous growth of multiple cracks. Here, we study this remarkable behaviour by means of a detailed model, and explore how the material and loading parameters concur in determining the macroscopic toughness of the system. By extending a previous study, our results show that rapid loading conveys material toughness by promoting distributed cracking. Moreover, our theoretical findings may suggest innovative architectures of flaw-insensitive materials with higher toughness.
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