Tahir Shayan, Usman Muhammad, Umer Malik Adeel
School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), H-12 Sector, Islamabad 44000, Pakistan.
School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), H-12 Sector, Islamabad 44000, Pakistan.
Polymers (Basel). 2022 Jul 21;14(14):2968. doi: 10.3390/polym14142968.
In this research, the synergistic behavior of magnetorheological elastomers containing nickel and cobalt along with iron particles as magnetically polarizable fillers is examined experimentally under dynamic shear loading. Two different types of magnetorheological elastomer were fabricated having equal proportions of iron and nickel in one kind, and iron and cobalt in the other. The concentrations of magnetic particles in each type are varied from 10% to 40% and investigated for several frequencies, displacement amplitude, and magnetic field values. A test assembly with moveable permanent magnets was used to vary magnetic field density. Force displacement hysteresis loops were studied for dynamic response of magnetorheological elastomers (MREs). It was observed that MREs showed a linear behavior at low strains while nonlinearity increased with increasing strain. The percentage filler content and frequency increased the MRE stiffness whereas it decreased with displacement amplitude. The computed maximum magnetorheological (MR) effect was 55.56 percent. While MRE with iron and cobalt gave the highest effective stiffness, MRE with iron and nickel gave the highest MR effect.
在本研究中，对含有镍、钴以及铁颗粒作为可磁极化填料的磁流变弹性体在动态剪切载荷下的协同行为进行了实验研究。制备了两种不同类型的磁流变弹性体，一种是铁和镍比例相等，另一种是铁和钴比例相等。每种类型中磁性颗粒的浓度在10%至40%之间变化，并针对多个频率、位移幅值和磁场值进行了研究。使用带有可移动永磁体的测试组件来改变磁场密度。研究了力-位移滞后回线以考察磁流变弹性体（MREs）的动态响应。观察到MREs在低应变时表现出线性行为，而随着应变增加非线性增强。填料含量百分比和频率增加了MREs的刚度，而其随位移幅值减小。计算得到的最大磁流变（MR）效应为55.56%。虽然含铁和钴的MREs具有最高的有效刚度，但含铁和镍的MREs具有最高的MR效应。
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