Improving transient magnetorheological response of magnetorheological elastomer by incorporating CIP@FeNi particles

Abstract

The transient magnetorheological response of magnetorheological elastomer (MRE) is critical to the control system in its applications. Overlong magnetorheological response time will prolong the control time delay of whole application system, which will lead to the degradation of control accuracy and timeliness, or even bring unwanted results. Therefore, it is particularly important to improve the transient magnetorheological response property of MRE for enhancing control efficiency of system. To this end, this paper synthesized a kind of new magnetic filler particle, carbonyl iron powder (CIP)@FeNi, which possesses Fe–Ni nano-flakes on its surface. Vibrating sample magnetometer test results showed that CIP@FeNi possessed superior magnetization under low magnetic field when compared with CIP. By partially replacement of CIP with CIP@FeNi, new dimorphic MREs were prepared. The influence of CIP@FeNi content on both of the transient magnetorheological response and magnetorheological mechanical properties of MRE were experimentally studied. Results indicated that CIP@FeNi is efficacious for improving the response velocity of MRE. In the rise edge, characteristic response time shows obvious decrease trend with increasing content of CIP@FeNi. In addition, at CIP@FeNi content of 2 vol% and 4 vol%, the doped CIP@FeNi can also enhance the magnetorheological property of MRE. This study provides a novel and effective way to improve the transient magnetorheological response property of MRE, which is of great significance for improving the control efficiency of MRE devices.