Structure and Dynamics of Force Clusters and Networks in Shear Thickening Suspensions,Physical Review Letters

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Structure and Dynamics of Force Clusters and Networks in Shear Thickening Suspensions
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-08-02 , DOI: 10.1103/physrevlett.129.068001
Mohammad Nabizadeh ₁ , Abhinendra Singh ₂ , Safa Jamali ₁

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Dense suspensions can exhibit shear thickening in response to large deformation. A consensus has emerged over the past few years on the formation of force networks, that span the entire system size, that lead to increased resistance to motion. Nonetheless, the characteristics of these networks are to a large extent poorly understood. Here, force networks formed in continuous and discontinuous shear thickening dense suspensions (CST and DST, respectively) are studied. We first show the evolution of the network formation and its topological heterogeneities as the applied stress increases. Subsequently, we identify force communities and coarse grain the suspension into a cluster network, and show that cluster-level dynamics are responsible for stark differences between the CST and DST behavior. Our results suggest that the force clusters formed in the DST regime are considerably more constrained in their motion, while CST clusters are loosely connected to their surrounding clusters.

中文翻译：

剪切增厚悬浮液中力簇和网络的结构和动力学

致密的悬浮液可以响应大变形而表现出剪切增稠。在过去的几年里，人们已经就形成跨越整个系统大小的力网络达成共识，这会导致运动阻力增加。尽管如此，这些网络的特征在很大程度上仍知之甚少。在这里，研究了在连续和不连续剪切增稠稠密悬浮液（分别为 CST 和 DST）中形成的力网络。我们首先展示了随着施加的应力增加网络形成的演变及其拓扑异质性。随后，我们确定了力社区并将悬浮液粗化成一个集群网络，并表明集群级动态是导致 CST 和 DST 行为之间明显差异的原因。

更新日期：2022-08-02

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