Abstract
Magnetorheological gel (MRG) is a smart material that can change its stiffness property by external magnetic field and has been applied as a smart rubber in suppressing vibration. Recent studies show that the electrical resistance of MRG also can be affected with external magnetic field. Thus, this study aimed to conduct analysis on MRG resistance variation due to external magnetic field with DC and AC input voltage. With an DC input voltage, the resistance change due to magnetic field was modeled. In addition, the capacitance variation of the material was observed. The impedance of MRG due to AC input voltage was analyzed and was observed that the impedance of MRG was affected by both the magnetic field and the input frequency. With the experiment data, the impedance modeling of MRG in frequency domain was derived. Based on experiment results, the performance and limitation of MRG as a magnetometer sensor are discussed.
Highlights
Magnetorheological elastomers (MREs) and magnetorheological gels (MRGs) are smart materials with rheological properties that change depending on the strength of the externally applied magnetic field [1]
MREs are manufactured by mixing iron particles with a silicon or rubber base, whereas MRGs are composed of iron particles in gelatin-based materials [2,3]
The results show that the repeatability of MRG resistance due to external magnetic field was within acceptable error
Summary
Magnetorheological elastomers (MREs) and magnetorheological gels (MRGs) are smart materials with rheological properties that change depending on the strength of the externally applied magnetic field [1]. An external magnetic field is applied to the magnetorheological (MR) materials during the fabrication process to form chain structures of iron particles aligned along the direction of the magnetic field. The internal stress among the chain structures of iron particles is the main factor that causes changes in the viscoelastic properties of MR materials, and this phenomenon is known as the MR effect (MR effect) [4,5,6,7,8]. Most research on MR materials focuses on the development of vibration suppression systems using the MR stiffness effect. Deng et al [9] developed a tunable vibration absorber (TVA) made of MREs that increases in stiffness by 118% when a current of 1.5 A is applied to the electromagnet
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