Tuning Active Magnetorheological Elastomers for Damping Applications

Abstract

Magnetorheological elastomers (MREs) were obtained by mixing soft polyurethane and carbonyl-iron particles. The effect of the volume fraction of the ferromagnetic particles on the MREs microstructure and properties, as well as their arrangement in relation to the external magnetic field were investigated. As a ferromagnetic component carbonyl–iron powder, with particle size from 6-9µm, was used. The amount of the carbonyl iron particles was varied from 1.5 to 33.0 %(v/v). The samples were produced with randomly dispersed and aligned carbonyl iron particles. Scanning electron and light microscopy techniques were used for the MRE microstructure observations. The rheological properties (G’, G’’ and tan δ) of the MRE were tested without and with the application of the magnetic field. It was found that the microstructure of MREs, particularly the amount and arrangement of the carbonyl-iron particles, has a significant influence on their rheological and damping properties.

Shear Elasticity of Magnetic Gels with Internal Structures

“…Magnetic gels are composites of nano- and micron-sized magnetic particles in soft polymer matrixes. The combination of a rich set of physical properties of the polymer and magnetic materials is very valuable for many progressive industrial, bioengineering, and biomedical applications [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. In part, for address drug delivery, for industrial and biological sensors [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ], for the construction of soft actuators and artificial muscles [ 2 , 15 ], and for regenerative medicine and tissue engineering [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Silicon carbide‐strengthened magnetorheological elastomer: Preparation and mechanical property

“…As the magnetic particles were locked within the polymer matrix, the sedimentation, instability, and leakage problem can be avoided in the MREs. As a solid analogy of MR fluids, the MREs have been proven to be the critical components for their applications in damper , brake , vibration control , isolator , and so on [].…”

Magnetorheological Effect of Magnetoactive Elastomer with a Permalloy Filler

“…The dependence of their macroscopic rheological properties on external magnetic fields is one of their fascinating features, which is attractive from the viewpoint of practical applications and challenging for scientific study. Opening the possibility to control their behavior with the help of moderate magnetic fields ranging from ~50 to ~600 mT, it makes these composites usable as magnetocontrollable active and passive devices such as actuators and dampers [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Thus, employing magnetorheological/magnetoactive elastomers (MREs/MAEs) as the operating element in shock-absorbing devices seems to be a sound design concept.…”

“…As may be noticed from the literature, among other materials, which might be used for the fabrication of magnetorheological (MR) materials including carrageenan [ 9 ], polyurethane [ 17 , 36 ], and copolymer gels SEBC [ 34 ], leadership has stably been held by silicone rubber [ 1 , 3 , 12 , 14 , 16 , 18 , 23 , 32 , 36 ]. Partly it is caused by the convenience of controlling the polymerization degree and thus the stiffness of the matrix [ 32 ].…”