Review : Material Aspects of Electrorheological Systems

Weiss, Keith D.; Carlson, J. D.; Coulter, John P.

doi:10.1177/1045389x9300400103

Cited by 145 publications

(63 citation statements)

References 97 publications

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“…Thus, the applications of the ER materials had been presented by many studies regarding the active control of the structural vibration and damping effect in recent years. Widely introduction about the applications of the ER material was presented by Weiss et al [20]. The detail investigations of the ER material on the composite structural vibration and damping effect can be traced to Yalcintas and Coulter [21] and they also studied the vibration behavior of the sandwich beam with ER fluid core and also discussed variations of the modal loss factors with different designed parameters.…”

mentioning

confidence: 98%

Vibration and damping analysis of orthotropic cylindrical shells with electrorheological core layer

Yeh

2011

Aerospace Science and Technology

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mentioning

confidence: 98%

Vibration and damping analysis of orthotropic cylindrical shells with electrorheological core layer

Yeh

2011

Aerospace Science and Technology

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“…The magnetic field required to activate an MR fluid is of the order of magnitude of tenths of Tesla [5] (which may be achieved using an ordinary 12 V battery if the magnetic circuit is properly designed). The corresponding electric field to activate an ER fluid is of the order of magnitude of kV, which requires high voltage equipment [7]. …”

Section: Mr-and Er-fluidsmentioning

confidence: 99%

Performance of isotropic magnetorheological rubber materials

2003

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Magnetorheological (MR) rubber materials are controllable composites that consist of magnetically polarisable particles in a rubber matrix. They belong to a group of socalled "smart materials" that have seen an increased interest recently. These materials have rheological properties that can be changed continuously, rapidly and reversibly by an applied magnetic field. With suitable control algorithms and solid state electronics, they can respond to changes in their environment. Although few applications of these materials have yet been reported in the literature, the possibilities for materials with controllable stiffness are numerous. Examples of potential applications are tuned vibration absorbers, and stiffness-tuneable mounts and suspensions.The purpose of this work is to increase our knowledge relating to magnetorheological materials for damping applications, using construction rubber as the matrix. The materials should exhibit large responses to an applied magnetic field and have good mechanical properties. In order to simplify their manufacture, the use of a magnetic field during production should, if possible, be avoided.MR rubber materials were made from nitrile and natural rubber, and irregularly shaped iron particles several micrometers in size. The particles were not aligned by a magnetic field prior to the vulcanisation; hence, the materials can be considered to be isotropic. These materials show a large MR effect, e.g. an increase in the shear modulus when a magnetic field is applied, although the particles are not aligned within the material. This is explained by the low critical particle volume concentration (CPVC) of such particles. Similar behaviour can be obtained with materials containing carbonyl iron, if the particles are aggregated and thereby behave like large irregular particles. The iron particle concentration has to be very close to the CPVC in order to obtain a large MR effect.The absolute MR effect in isotropic MR rubber materials with large irregular iron particles is independent of the matrix material, and the relative MR effect can thus be increased by the addition of plasticisers. Other ways of increasing the MR effect are to increase the strength of the magnetic field, although the materials saturate magnetically at high field strengths, or to use small strain amplitudes. The strong strain amplitude dependence of the MR effect suggests that isotropic MR rubber materials are most suitable for low amplitude applications, such as sound and vibration insulation. Measurements at frequencies within the audible frequency range show that this is a promising application for isotropic MR rubber materials.

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“…Works on structural transformations and relevant effects in MRSs are reviewed in [1]. The results of original computer and laboratory experiments on structural transformations can be found in [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

On the Theory of Phase Transitions in Magnetorheological Suspensions

Iskakova¹,

Zubarev²,

Romanchuk³

2005

Colloid J

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The "condensation" of the particles of magnetorheological suspensions (MRSs) under the action of an external magnetic field is theoretically studied. The analysis demonstrated that the formation of rather long linear chain aggregates preceded the condensation of particles into the dense phase. The phase transition of the "gas-liquid" type proceeded in a particle ensemble via the "condensation" of such chains caused by their magnetic interaction. In thin MRS layers oriented perpendicular to the external magnetic field, the scenario of phase transition differs from that observed in systems with infinite volume. After the completion of the phase transition, the ensemble of dense domains discretely distributed in dilute dispersion is formed in thin layers rather than two simple connected phases with different particle concentrations, as it takes place in infinite media. Under fairly strong external magnetic fields, the transition of the "gas-solid" type occurs in a system of particles.

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Review : Material Aspects of Electrorheological Systems

Cited by 145 publications

References 97 publications

Vibration and damping analysis of orthotropic cylindrical shells with electrorheological core layer

Vibration and damping analysis of orthotropic cylindrical shells with electrorheological core layer

Performance of isotropic magnetorheological rubber materials

On the Theory of Phase Transitions in Magnetorheological Suspensions

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