Shear jamming onset in dense granular suspensions
Shear jamming onset in dense granular suspensions
复制标题
致密颗粒悬浮液中发生剪切干扰
DOI：
10.1122/8.0000190
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发表时间：
2021-04
影响因子：
3.3
通讯作者：
Xinglong Gong
中科院分区：
文献类型：
--
作者：
Saisai Cao;Yu Wang;Haoming Pang;Junshuo Zhang;Yuxuan Wu;Shouhu Xuan;Xinglong Gong
在密相颗粒悬浮体系中可以观察到不连续剪切增稠和动态剪切堵塞现象。本文通过研究稠密颗粒悬浮体稳态流变时的第一法向应力差N1，确定了剪切堵塞发生的判据。当N1 = 0时，悬架为剪切型，摩擦接触占主导地位.堵塞起始应力随颗粒体积分数的增大而减小。润滑-摩擦机制预测了剪切卡阻的发生，并与Wyart-Cates模型预测的趋势一致。通过对N1的分析，可以在状态图中区分稠密颗粒悬浮体的状态。这项工作可以帮助理解的流变性的浓缩颗粒悬浮液。
Discontinuous shear thickening and dynamic shear jamming can be observed in the dense granular suspension. Here, we determine the criterion for the occurrence of shear jamming by studying the first normal stress difference N 1 of dense granular suspension in steady-state rheology. When N 1 = 0, the suspension is shear jammed, and the frictional contact dominates the framework. The jamming onset stress decreases when the particle volume fraction increases. The lubrication to friction mechanism predicts the occurrence of shear jamming and is consistent with the trend predicted by the Wyart–Cates model. The state of a dense granular suspension can be distinguished in the state diagram via the analysis of N 1. This work can aid understanding of the rheology of concentrated particle suspensions.