Measuring the mechanical responses of a jammed discontinuous shear-thickening fluid
Measuring the mechanical responses of a jammed discontinuous shear-thickening fluid
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测量堵塞的不连续剪切增稠流体的机械响应
DOI：
10.1063/1.5005966
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发表时间：
2017-11-13
影响因子：
4
通讯作者：
Zhang, Taihua
中科院分区：
文献类型：
--
作者：
Jiang, Weifeng;Peng, Guangjian;Zhang, Taihua
在许多致密悬浮液中观察到的不连续剪切增厚是相当复杂的，但它是短暂的。干扰后的细节尚不清楚。通过使用带有模数转换器的改进型流变仪，我们发现了干扰后剪切应变的三种幅值状态。剪切模量和力链角随应变增大而增大；堵塞状态逐渐加深。其次，随着剪切应力的进一步增大，堵塞状态是稳定的；力链角度恒定，力网稳定。三是堵塞状态不能抵抗剪切应力的进一步增大；随着力链角度的增大，力链网断裂。
Discontinuous shear thickening observed in many dense suspensions is rather complicated but takes place as a transient. Its details after jamming are still not clear. By using a modified rheometer with an analog-to-digital converter, we show that there are three amplitude regimes of shear strain after jamming. First, the shear modulus and the force chain angle increase with strain; the jammed state gradually deepens. Second, the jammed state is stable against a further increase in shear stress; the force chain angle is constant and the force network is stable. Third, the jammed state cannot resist a further increase in shear stress; with the increase in the force chain angle, the force chain network is broken.