Experimental investigation on the influence of temperature on the hysteresis behavior of magnetorheological gel by employing a large-amplitude-oscillation-shear test method

It is of great significance to explore the mechanism of temperature influence on magnetorheological gel before employing materials for device design. Because of the temperature of the materials rising by the coil during the working process, the wall sliding effect, the interaction between the particles and the interaction between the particles and the polymer chain occur inevitably, which further affects the mechanical properties of the material. This study investigated the effect of temperature on magnetorheological hysteresis properties and its mechanism by employing a large-amplitude-oscillation-shear test method at different temperatures (i.e., 10 °C, 30 °C, 50 °C, 70 °C, 90 °C). The temperature behavior of the MR gel-70 is experimentally evaluated under various loading conditions, including five levels of current inputs of 0 A, 0.5 A, 1 A, 2 A and 4 A, and three excitation frequencies of 5 Hz, 10 Hz and 15 Hz, respectively. The microstructure and the magnetic performance of the sample are probed by employing a scanning electron microscope and vibrating sample magnetometer. It is indicated from the result that magnetorheological gel as a magnetized-induced material and its mechanical properties are greatly influenced by temperature, current and frequency.