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Experimental investigation on hysteretic behavior of a shear thickening fluid damper

机译：剪切增稠流体阻尼器滞回特性的实验研究

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In this study, a shear thickening fluid (STF) damper was experimented upon under different loading frequencies and amplitudes to investigate its nonlinear hysteretic behavior and energy dissipation capacity. An STF sample with 20% mass fraction and dispersion medium were prepared by nanoparticle silica (SiO2) and polyethylene glycol (PEG200). By using a parallel-plate rheometer, steady-state experiments were carried out to characterize the rheological properties of the sample. The results indicate that the STF sample shows an abrupt increase in viscosity/stress beyond a critical shear rate/strain. The results also show that the STF sample has good reversibility, thixotropy, and stability and can be used as a smart damping material in damper devices. Also, a prototype damper was developed and manufactured. Its nonlinear hysteretic behavior and energy dissipation capacity were experimentally investigated through the responses of damping force-displacement and damping force-velocity. The results show that the STF damper has excellent damping force as the loading condition increases and the controllability can be increased up to 3.21 times. The results also show that the energy dissipation capacity formed by damping force-displacement becomes fuller as the loading condition increases. Moreover, the results show that the graphical shapes of hysteretic loops of damping force-velocity can exhibit various styles as the STF's mechanism changes but the shapes are not stable when the velocity exceeds a certain value.
机译：在这项研究中，在不同的加载频率和振幅下，对剪切增稠流体（STF）阻尼器进行了试验，以研究其非线性滞后行为和能量耗散能力。用纳米二氧化硅（SiO2）和聚乙二醇（PEG200）制备质量分数为20％的STF样品和分散介质。通过使用平行板流变仪，进行了稳态实验以表征样品的流变性质。结果表明，STF样品显示出超过临界剪切速率/应变的粘度/应力突然增加。结果还表明，STF样品具有良好的可逆性，触变性和稳定性，可用作阻尼器设备中的智能阻尼材料。而且，原型阻尼器被开发和制造。通过阻尼力-位移和阻尼力-速度的响应，研究了其非线性滞后行为和能量耗散能力。结果表明，随着载荷条件的增加，STF阻尼器具有出色的阻尼力，可控性提高到3.21倍。结果还表明，随着载荷条件的增加，阻尼力-位移形成的能量消散能力变得更充分。此外，结果表明，随着STF机构的变化，阻尼力-速度的滞回环的图形形状可以表现出各种样式，但是当速度超过一定值时，形状不稳定。

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