Topic
Magnetorheological fluid
About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.
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01 Jan 2002
TL;DR: In any discussion of fluids which have magnetic properties, it is convenient to divide them into the following categories, (A) ferrofluids; (B) magnetorheological fluids; (C) dispersions of micron-sized particles of a non-magnetic material containing magnetic nano-size particles, and (D) fluids containing paramagnetic particles.
Abstract: In any discussion of fluids, which have magnetic properties, it is convenient to divide them into the following categories, (A) ferrofluids; (B) magnetorheological fluids; (C) dispersions of micron-sized particles of a non-magnetic material containing magnetic nano-sized particles, and (D) fluids containing paramagnetic particles
117 citations
TL;DR: In this paper, the effects of interactions between iron particles and the matrix on the performance of MR elastomers based on silicon rubber, including MR effect and mechanical properties, were investigated.
117 citations
TL;DR: In this article, the yield stress of a magnetorheological suspension is calculated from two different approaches: a mesoscopic description of the structure taking only into account the shape anisotropy of the strained aggregates, and a microscopic approach where the interparticle forces, due to the application of the field, are calculated numerically by taking into account magnetostatics between the particles inside the aggregates.
Abstract: The yield stress of a magnetorheological suspension is calculated from two different approaches. The first one is based on a mesoscopic description of the structure taking only into account the shape anisotropy of the strained aggregates. The second one is based on a microscopic approach where the interparticle forces, due to the application of the field, are calculated numerically by taking into account the magnetostatics between the particles inside the aggregates. We show that the macroscopic description well applies to suspensions of nonmagnetic particles in a ferrofluid and that a layered structure, consisting of parallel slabs of magnetizable materials should have a yield stress much higher than a structure made of cylindrical aggregates. On the other hand the microscopic approach is appropriated for the description of suspensions of particles of high permeability. In this case, the yield stress is mainly determined by the rupture between pairs of particles and, consequently, it strongly increases with the angle between the line of centers of the pair undergoing the rupture and the field.
117 citations
TL;DR: In this article, the viscoelastic properties of silicone-based magnetorheological elastomer matrix composites have been investigated in terms of their storage and loss moduli.
Abstract: Magnetorheological (MR) elastomers are composite materials consisting of magnetic particles in elastomer matrices, whose mechanical properties can be influenced by applying a magnetic field. Main parameters which determine the behavior of these smart materials are the concentration of the magnetic particles and the mechanical stiffness of the elastomer matrix. The viscoelastic properties of silicone-based MR elastomers are outlined in terms of their storage and loss moduli. The mechanical behavior of the material is also influenced by a magnetic field during the curing of the elastomer matrix, which leads to materials with anisotropic microstructures. The storage modulus of soft elastomer matrix composites can be increased in the presence of a magnetic field by significantly more than one order of magnitude or several hundreds of kPa. The relative increase exceeds that of all previously reported data. A shape memory effect, i. e. the deformation of an MR elastomer in a magnetic field and its return to original shape on cessasion of the magnetic field, is described.
116 citations
TL;DR: In this paper, the elasticity of urethane magnetorheological elastomers (MREs) consisting of carbonyl-iron particles in a polyurethane matrix were studied.
Abstract: In this paper, urethane magnetorheological elastomers (MREs) consisting of carbonyl-iron particles in a polyurethane matrix were studied. The volume fraction of particles was equal to 11.5%. Three types of ferromagnetic particles were used, with average particle size ranging from 1 to 70 μm. The elastic (storage) modulus G ′ was measured as a function of angular frequency ω and strength of magnetic field. The measured G ′ values were approximated with empirical model. The highest magnetorheological effect has been found for samples with 6–9 μm carbonyl-iron powder. The highest increase in the yield stress is observed for samples with particles aligned at 30° to the magnetic field lines. It has been found that rheological properties strongly depend on the MRE microstructure, in particular on the size/shape of particles and their arrangement. By optimizing the particles size, shape and alignment, the stiffness of MREs has been increased under applied magnetic field.
116 citations