近脆性-塑性转变处水凝胶颗粒筏的本构流变定律
Constitutive flow law for hydrogel granular rafts near the brittle-ductile transition
AI总结：
本研究提出了一种适用于近脆性-塑性转变处水凝胶颗粒筏的本构流变定律，结合了干颗粒流变学与非局部效应及阻尼粘性流动。
摘要：
在干颗粒流中已识别出空间变化的流变定律，但其在未阻塞悬浮液中的适用性仍不明确。本研究表明，准静态悬浮液流动结合了干颗粒流变学与剪切带中的非局部效应以及外侧蠕变区域的阻尼粘性流动。通过在水凝胶颗粒筏上进行旋转剪切实验，我们观察到流体从界面处衰减，在准静态状态下，即使在屈服应力以下，颗粒仍保持移动。这些发现表明，在阻塞/脆性颗粒行为与未阻塞/塑性粘性流之间的转变中存在普遍的流变定律。
英文摘要：
Spatially varying flow laws have been identified in dry granular flow, yet their applicability to unjammed suspensions remains unclear. This study demonstrates that the quasistatic suspension flow combines dry granular rheology with nonlocal effects in the shear band and damped viscous flow in the outer creep region. Through rotary shear experiments on a hydrogel granular raft, we observe that the flow decays from the interface in the quasistatic regime, where the particles remain mobile even below the yield stress. These findings suggest the universal flow law across the transition between jammed/brittle granular behavior and unjammed/ductile viscous flow.
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