Investigation of the dynamic response of isotropic magnetorheological elastomers in shear-sandwich mode: Effects of frequency and temperature variations

Magnetorheological elastomers (MREs) are smart viscoelastic materials with tunable dynamic properties, typically consisting of an elastomeric matrix with suspended carbonyl iron particles (CIPs). When exposed to an external magnetic field, interactions between the magnetic particles cause deformations in the MRE structure, altering dynamic characteristics. These properties have spurred interest in MRE-based devices requiring tunable dynamics. This research examines the influence of frequency and temperature on isotropic MREs in shear mode with varying CIP compositions. Homogenously dispersed CIPs with concentrations of 5%, 10%, and 20% (hard or soft) are used. The frequency and temperature dependence are analyzed on a dynamic mechanical analyzer (DMA) in shear mode. The results show strong storage and loss moduli dependence on frequency. Increased external magnetic field intensity enhances MRE dynamic properties, with optimal effects at 10% volume fractions, especially for hard CIPs. Temperature effects are negligible, demonstrating strong thermal stability. These findings offer insights into the dynamic properties of MREs, aiding the development of MRE-based devices operating in shear mode.