论文标题
粘性力控制剪切厚的致密悬浮液的撞击响应
Viscous-like forces control the impact response of shear-thickening dense suspensions
论文作者
论文摘要
我们在实验和理论上研究对密集的玉米淀粉和水悬浮液的影响。我们改变了影响速度以及入侵者的大小，形状和质量，我们使用高速视频和板载加速度计来表征所得的动力学。我们在数值上求解了先前提出的模型，最著名的是添加的质量模型以及一类{粘性}模型。在{粘性模型}中，入侵者动力学以{大型的粘性类力}在堵塞前部的边界处的{大，粘性的力}（其中较大的剪切速率和伴随的大粘度都存在。}我们发现，我们的实验数据与这些类别的模型和不一致的质量模型一致。我们的结果强烈表明，应更新添加的质量模型，该模型是理解影响剪切厚的致密悬浮液中的主导模型，以包括这些类似粘性的力。
We experimentally and theoretically study impacts into dense cornstarch and water suspensions. We vary impact speed as well as intruder size, shape, and mass, and we characterize the resulting dynamics using high-speed video and an onboard accelerometer. We numerically solve previously proposed models, most notably the added-mass model as well as a class of {viscous-like} models. In the {viscous-like models}, the intruder dynamics are dominated by {large, viscous-like forces} at the boundary of the jammed front {where large shear rates and accompanying large viscosities are present.} We find that our experimental data are consistent with this class of models and inconsistent with the added mass model. Our results strongly suggest that the added-mass model, which is the dominant model for understanding the dynamics of impact into shear-thickening dense suspensions, should be updated to include these viscous-like forces.
