Abstract

In the presence of a magnetic field, the viscosity and storage modulus of magnetic materials like magnetorheological (MR) fluids and magnetorheological elastomers change significantly. There are numerous studies on these MR fluid and elastomer materials. In contrast, the MR brush is less frequently investigated and comprehended. The brush-like structures made from chains of magnetic particles embedded in a carrier matrix, typically fluids or elastomers, are what make up an MR brush. The magneto-mechanical properties of the magnetorheological fluid (MRF) brush and themagnetorheological elastomer (MRE) brush are the focus of this investigation. The investigation measured the stiffness and the MR response, which is the change in MRF and MRE brushes’ properties when subjected to a magnetic field.The concentration of magnetic particles and the curing flux density (for MRE brush) were examined to learn more about how the magnetic effect is influenced by the material and preparation parameters. In this study, a proposed metric for comparing the brushes’ responsiveness is the Magnetorheological response index. The MRE brush has a higher absolute stiffness but a lower MR response than the MRF brush, according to the findings. When there are more magnetic fillers in MRF and MRE brushes, the MR response gets stronger. MRE brushes have a better MR response than MRF brushes, which could be related to an increase in the magnetic flux density during the curing process. This study opens up a new avenue in the field of magnetic materials thanks to its fundamental investigation of both solid and fluid MR brushes. When soft and tuneable bristle-like structures are desired, this new category of magnetically controllable materials might be used.