Ananzeh Hammam M, Ramli Rahizar, Julai Sabariah, Muthalif Asan G A
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar.
Polymers (Basel). 2024 Apr 26;16(9):1215. doi: 10.3390/polym16091215.
Magnetorheological (MR) materials are smart materials that can change their rheological characteristics when exposed to a magnetic field. Such rheological properties include viscosity and dynamic modulus. MR materials have emerged as one of the most efficient smart materials that can modify mechanical and viscoelastic characteristics. Depending on the medium used, MR materials can be classified into two types: magnetorheological fluids (MRFs) and magnetorheological elastomers (MREs). MREs are classified as isotropic or anisotropic based on CIP distribution inside the elastomer matrix. A unique hybrid material incorporating MRE and MRF is constructed in this work to investigate, compare, and the dynamic properties of isotropic, anisotropic, hybrid isotropic, and hybrid anisotropic MREs under various magnetic fields (0, 104, and 160.2 mT). The created samples are subjected to extensive testing, including static and dynamic evaluations. In the static tests, experiments use a compression linear displacement mode with a fixed maximum gap change of 3 mm. The temperature is maintained at a constant level of 24 °C throughout the 40 s test duration for each test, and the magnetic field is incrementally increased by varying the number of magnets, ranging from 0 to 160.2 mT for dynamic qualities using compression oscillations on a dynamic mechanical analyzer (DMA), including frequency and strain-dependent data. These experiments, carried out using sinusoidal shear movements, include an excitation frequency range of 0.1 Hz to 15 Hz while preserving, with a fixed shear strain of 2%.
磁流变（MR）材料是一种智能材料，当暴露于磁场中时，其流变特性会发生变化。这种流变特性包括粘度和动态模量。MR材料已成为能够改变机械和粘弹性特性的最高效智能材料之一。根据所使用的介质，MR材料可分为两类：磁流变液（MRF）和磁流变弹性体（MRE）。根据弹性体基质内部的CIP分布，MRE可分为各向同性或各向异性。在这项工作中，构建了一种独特的包含MRE和MRF的混合材料，以研究、比较各向同性、各向异性、混合各向同性和混合各向异性MRE在各种磁场（0、104和160.2 mT）下的动态特性。对制备的样品进行了广泛的测试，包括静态和动态评估。在静态测试中，实验采用压缩线性位移模式，最大间隙变化固定为3 mm。在每次测试持续40 s的过程中，温度保持在24℃的恒定水平，通过改变磁体数量使磁场逐渐增加，在动态机械分析仪（DMA）上使用压缩振荡来测量动态特性，包括频率和应变相关数据，磁场范围从0到160.2 mT。这些使用正弦剪切运动进行的实验，激发频率范围为0.1 Hz至15 Hz，同时保持固定的2%剪切应变。
