Study on the Magnetic Rate Sensitivity and Shear Properties of Magnetorheological Shear Thickening Fluid

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Guo-Jun Yu, Shao-Jie Zhu, Cheng-Bin Du, Ling-Yun Wang, Jun-Chi Huang
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引用次数: 0

Abstract

This paper studies magnetic field control and velocity-activated magnetorheological shear thickening fluid (MR-STF). High-concentration STF is composed of nano-sized silica particles suspended in a solvent polyethylene glycol (PEG), and then micron-sized carbonyl iron particles of different mass fractions are added to the STF to manufacture different MR-STF. The rheometer is used to study the viscoelasticity of all four samples. The correlation between dynamic behavior and shear rate, angular frequency, and external magnetic field is studied and discussed. In the lower angular frequency range, the loss modulus is slightly larger than the storage modulus, and MR-STF behaves as a viscoelastic state. After the critical angular frequency, the storage modulus decreases sharply, well below the loss modulus. MR-STF appears in a viscous state and a liquid state. With the start of external field excitation, MR-STF is more inclined to MRF. Finally, the apparent viscosity and shear rate of MR-STF are fitted. The results show that with the increase of magnetic induction strength, the plastic viscosity coefficient of MR fluid increases, the flow characteristic index decreases, and the shear thinning effect becomes more significant.
磁流变剪切增稠液的磁率灵敏度及剪切性能研究
研究了磁场控制和速度激活磁流变剪切增稠液(MR-STF)。高浓度STF是由悬浮在溶剂聚乙二醇(PEG)中的纳米级二氧化硅颗粒组成,然后在STF中加入不同质量分数的微米级羰基铁颗粒,制成不同的MR-STF。流变仪用于研究所有四种样品的粘弹性。研究和讨论了剪切速率、角频率和外加磁场对动态性能的影响。在较低的角频率范围内,损耗模量略大于存储模量,MR-STF表现为粘弹性状态。在临界角频率之后,存储模量急剧下降,远低于损耗模量。MR-STF以粘性和液态两种状态出现。随着外场激励的开始,MR-STF更倾向于MRF。最后对MR-STF的表观粘度和剪切速率进行了拟合。结果表明:随着磁感应强度的增大,磁流变液的塑性黏度系数增大,流动特性指数减小,剪切减薄效应更加显著;
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来源期刊
Journal of Magnetics
Journal of Magnetics MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED
CiteScore
1.00
自引率
20.00%
发文量
44
审稿时长
2.3 months
期刊介绍: The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.
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