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Understanding the super-strong behavior of magnetorheological fluid in simultaneous squeeze-shear with the Peclet number

机译:了解具有Peclet数的同时挤压剪切过程中磁流变液的超强行为

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摘要

Under squeezing flow, magnetorheological fluid can undergo a strengthening phenomenon which results in a drastic increase of its yield stress. This behavior, also known as the super-strong effect, could be used to significantly increase the performance (e.g. torque-to-weight) of rotary magnetorheological fluid devices (e.g. brakes, clutches), but has yet to be exploited due to limited predictability of the phenomenon. To better understand the occurrence of the super-strong effect, a novel test bench capable of small amplitude oscillatory shear is designed to study the behavior of high-concentration magnetorheological fluid submitted to different simultaneous squeeze-shear conditions and magnetic field strengths. Experimental results, obtained up to 5mm/s compression speed, show that the squeeze-strengthening effect can be correlated to the Peclet number when squeeze flow is dominant, suggesting that the super-strong behavior is governed by solid-liquid phase separation. This super-strong effect, however, is found greatly reduced when the super-imposed shear-rate approaches the squeeze-rate order of magnitude.
机译:在挤压流动下,磁流变流体会发生强化现象,从而导致其屈服应力急剧增加。这种行为,也称为超强效应,可用于显着提高旋转磁流变流体设备(例如制动器,离合器)的性能(例如,扭矩至重量),但由于可预测性有限而尚未被开发的现象。为了更好地了解超强效应的发生,设计了一种具有小振幅振荡剪切能力的新型试验台,以研究高浓度磁流变液在不同的同时挤压剪切条件和磁场强度作用下的行为。在高达5mm / s的压缩速度下获得的实验结果表明,当挤压流占主导地位时,挤压增强效果可能与Peclet数相关,这表明超强行为受固液相分离的支配。但是,当叠加的剪切速率接近挤压速率的数量级时,这种超强效应会大大降低。

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