Ali Abdelrahman, Salem Ayman M H, Muthalif Asan G A, Ramli Rahizar Bin, Julai Sabariah
Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar.
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
Materials (Basel). 2022 Apr 30;15(9):3238. doi: 10.3390/ma15093238.
Magnetorheological elastomers (MREs) are a class of emerging smart materials in which their mechanical and rheological properties can be immediately and reversibly altered upon the application of a magnetic field. The change in the MRE properties under the magnetic field is widely known as the magnetorheological (MR) effect. Despite their inherent viscoelastic property-change characteristics, there are disadvantages incorporated with MREs, such as slow response time and the suspension of the magnetic particles in the elastomer matrix, which depress their MR effect. This study investigates the feasibility of a hybrid magnetorheological elastomer-fluid (MRE-F) for longitudinal vibration isolation. The hybrid MRE-F is fabricated by encapsulating MR fluid inside the elastomer matrix. The inclusion of the MR fluid can enhance the MR effect of the elastomer by providing a better response to the magnetic field and, hence, can improve the vibration isolation capabilities. For this purpose, an MRE-based coupling is developed, and isolation performance is investigated in terms of the linear transmissibility factor. The performance of the hybrid MRE-F was compared against two different MRE samples. The results show that further enhancement of MR-effect in MREs is possible by including MR fluid inside the elastomer. The hybrid MRE-F exhibited better stiffness change with the current increase and recorded the highest value of 55.911 N/mm. The transmissivity curves revealed that the MRE-F contributed to a broader shift in the natural frequency with a 7.2 Hz overall shift at 8.9 mT. The damping characteristics are higher in MRE-F, recording the highest percentage increase in damping with 33.04%. Overall, the results reveal the promising potential of hybrid MRE-F in developing MRE-based coupling for longitudinal vibration isolation.
磁流变弹性体（MREs）是一类新兴的智能材料，在施加磁场时，其机械和流变性能能够立即且可逆地改变。MREs在磁场作用下性能的变化被广泛称为磁流变（MR）效应。尽管MREs具有固有的粘弹性性能变化特性，但也存在一些缺点，比如响应时间慢以及磁性颗粒在弹性体基质中的悬浮问题，这些都会削弱其MR效应。本研究探讨了一种用于纵向隔振的混合磁流变弹性体-流体（MRE-F）的可行性。通过将磁流变液封装在弹性体基质中来制备混合MRE-F。磁流变液的加入可以通过对磁场提供更好的响应来增强弹性体的MR效应，从而提高隔振能力。为此，开发了一种基于MRE的联轴器，并根据线性传递率因子研究其隔振性能。将混合MRE-F的性能与两种不同的MRE样品进行了比较。结果表明，通过在弹性体内加入磁流变液，可以进一步增强MREs的MR效应。混合MRE-F随着电流增加表现出更好的刚度变化，记录到的最高值为55.911N/mm。传递率曲线表明，MRE-F使固有频率有更广泛的偏移，在8.9mT时整体偏移7.2Hz。MRE-F的阻尼特性更高，记录到的阻尼最大百分比增加为33.04%。总体而言，结果揭示了混合MRE-F在开发用于纵向隔振的基于MRE的联轴器方面具有广阔的潜力。
