Shear jamming and fragility in dense suspensions
Shear jamming and fragility in dense suspensions
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DOI：
10.1007/s10035-019-0931-5
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发表时间：
2019-02
期刊：
影响因子：
2.4
通讯作者：
Ryohei Seto;Abhinendra Singh;B. Chakraborty;M. Denn;J. Morris
中科院分区：
文献类型：
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作者：
Ryohei Seto;Abhinendra Singh;B. Chakraborty;M. Denn;J. Morris
剪切引起的堵塞现象是稠密悬浮液复杂流变行为中的一个因素。这种剪切堵塞状态是脆弱的，即，它们对于与产生它们所施加的应力不相容的施加应力是不稳定的。这种特殊的流动历史依赖的应力响应是由于流动诱导的微观结构。为了研究在恒定剪切应力下实现的堵塞状态，我们对具有摩擦接触力和流体动力润滑力的非布朗粒子进行了动态模拟。我们发现明确的签名，区分这些脆弱的国家从更传统的各向同性堵塞状态。
The phenomenon of shear-induced jamming is a factor in the complex rheological behavior of dense suspensions. Such shear-jammed states are fragile, i.e., they are not stable against applied stresses that are incompatible with the stress imposed to create them. This peculiar flow-history dependence of the stress response is due to flow-induced microstructures. To examine jammed states realized under constant shear stress, we perform dynamic simulations of non-Brownian particles with frictional contact forces and hydrodynamic lubrication forces. We find clear signatures that distinguish these fragile states from the more conventional isotropic jammed states.