剪切增稠液及阻尼器性能研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (18) : 15-20.

论文

剪切增稠液及阻尼器性能研究

周鸿，郭朝阳，宗路航，宣守虎，龚兴龙

作者信息 +

Study on the performance of shear thickening fluid and its application as a damper

ZHOU Hong, GUO Chao-yang, ZONG Lu-hang, XUAN Shou-hu, GONG Xing-long

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摘要

以聚苯乙烯-丙烯酸乙酯纳米粒子为分散介质，制备剪切增稠液（Shear Thickening Fluid, STF），研究以STF为工作介质的双出杆式阻尼器动态性能，利用流变仪测量STF流变特性。实验结果显示，STF粘度特性曲线呈现明显非线性：低剪切速率时轻微剪切变稀（shear thinning）；达临界剪切速率后剪切增稠（shear thickening）。利用MTS对阻尼器进行不同频率、不同振幅加载条件下的动态测试，结果表明，阻尼器工作在STF剪切增稠区间时，STF粘度急剧增加，储能模量、耗能模量迅速增大，阻尼器输出力跃升，表现出巨大的吸收及耗能能力。采用以有效刚度、有效粘滞阻尼建立线性模型，定性评价STF阻尼器的弹性特性、阻尼特性。

Abstract

A shear thickening fluid (STF) composed of polystyrene-ethyl acrylate (P(ST-EA)) nanoparticles suspended in glycol was prepared and the dynamic properties of its application as a damper were investigated. The rheological properties of STF have been measured under steady and oscillatory shear tests by a rheometer. Experimental results show that the viscosity curves of STF can be divided into three regions: slight shear thinning with low shear rate; significant shear thickening at critical shear rate; shear thinning again with higher shear rate. Dynamic tests of the STF-filled damper were conducted by using a material test system (MTS) with varied excitation frequency and amplitude. When the damper is subjected to external applied excitation at critical shear rate, output force abruptly increased due to a steep rise in viscosity of STF, as well as storage modulus and loss modulus. It indicates that STF has tremendous ability of energy absorption and dissipation. A linear model with effective stiffness and effective viscous damping was developed in order to evaluate elastic and damping characteristic of the STF-filled damper.

导出引用

周鸿;郭朝阳;宗路航;宣守虎;龚兴龙 . 剪切增稠液及阻尼器性能研究[J]. 振动与冲击, 2013, 32(18): 15-20

ZHOU Hong;GUO Chao-yang;ZONG Lu-hang;XUAN Shou-hu;GONG Xing-long. Study on the performance of shear thickening fluid and its application as a damper[J]. Journal of Vibration and Shock, 2013, 32(18): 15-20