Compression properties of magnetostrictive polymer composite gels

Farshad, M.; Roux, Magali Le

doi:10.1016/j.polymertesting.2004.09.007

Cited by 83 publications

(57 citation statements)

References 8 publications

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“…In order to develop constitutive models characterising the complex behaviour of MREs, extensive experimental data derived from uniaxial and multiaxial deformation modes on the same type of material are required [10,11,12]. The large strain behaviour of MREs has been studied mainly under compression and simple shear [13,14,15,16,17] while, to the best of the authors knowledge the behaviour of MREs under pure shear or multi-axial deformations has yet to be investigated. So far, the variety of materials used in previous large-strain experiments makes it difficult to compare results from different investigations.…”

Section: Introductionmentioning

confidence: 99%

Large-strain behaviour of Magneto-Rheological Elastomers tested under uniaxial compression and tension, and pure shear deformations

2015

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The large-strain behaviour of Magneto-Rheological Elastomers (MREs) is characterised experimentally under uniaxial compression, uniaxial tension and pure shear deformation both in the absence and in the presence of magnetic fields. MREs are ''smart' materials that can alter their properties instantaneously by the application of external stimuli. They hold great potential for use in adaptive stiffness devices. So far, the large-strain behaviour of MREs has not been well explored, and their behaviour under pure shear deformation has not been characterised. Tests on silicone rubber based isotropic and anisotropic MREs, without and with the application of an external magnetic field have been performed in this investigation. The MR effect, defined as the increase in tangent moduli, is studied versus large engineering strain. Strains were measured optically using a Digital Image Correlation (DIC) system. Relative MR effects up to 284% were found under uniaxial tension, when a magnetic field strength of 290 mT was applied with the loading direction parallel to the direction of particle alignment.

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Section: Introductionmentioning

confidence: 99%

Large-strain behaviour of Magneto-Rheological Elastomers tested under uniaxial compression and tension, and pure shear deformations

2015

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“…MREs exhibit reversible changes of their properties and shape under the magnetic field, what makes them attractive for applications as dampers, sensors or actuators, e.g. An and Shaw [5], Farshad and Le Roux [6]. The automotive bushing based on MREs, adjusted to reduce suspension deflection and to improve passenger comfort, were patented by Watson [7] and Steward et al [8] for Ford Motor Company.…”

Section: Introductionmentioning

confidence: 99%

Effect of the elastomer stiffness and coupling agents on rheological properties of magnetorheological elastomers

Boczkowska

Awietjan

2011

WIT Transactions on Engineering Sciences

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The reported studies are related to a new group of intelligent materials, such as magnetorheological elastomers (MREs), which are composites of ferromagnetic particles embedded in elastomer matrix. Studies on fabrication of MREs were carried out using two different polyurethane elastomers as a matrix, ferromagnetic particles and coupling agent. The matrices were differed in elastomer stiffness and hardness. As a ferromagnetic component carbonyl-iron powder with particle size of 6-9 µm was used. Particles were oriented into chains under the external magnetic field of 240 kA/m. Samples with anisotropic particles arrangement and particles volume fraction equal to 11.5% were examined. Microstructure of MREs was observed using Scanning Electron Microscopy. Structural and magnetic anisotropy of the MREs was derived from the magnetic studies. Rheological properties of the MREs, such as storage and loss modulus and loss factor, were characterized as a function of shear frequency and strength of the magnetic field. Absolute and relative magnetorheological effects were calculated taking the microstructure into account, which was formed in the course of the MRE fabrication, by changing the elastomer type and application of the coupling agent. As a result of the studies it was found that the MREs with stiffer matrix exhibit much lower MR effect than the soft ones. Also the application of coupling agent lead to a decrease of MR effect by the formation of bound elastomer surrounding the particles, which increases the stiffness of the matrix.

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“…This type of magneticpolymer composite (Magpol), also termed ferrogel, [1][2][3][4][5][6][7][8] magnetic gels, [9,10] magnetic field sensitive gel, [11][12][13][14][15][16] magnetorheological elastomer, [17,18] or magnetoactive polymer, [19] can readily change its shape and mechanical properties upon exposure to an external magnetic field. Many applications have been identified for Magpol including controllable dampers, [20] stiffness tunable supports, [21] miniature fluid pumps, [22] drug delivery, [23] cancer treatment, [23] sensors, [24,25] soft transducers, and artificial muscles. [26] Actuation occurs because an external magnetic field exerts a force on the magnetic filler particles, causing the movement of the entire composite.…”

Section: Introductionmentioning

confidence: 99%

Novel Coiling Behavior in Magnet‐Polymer Composites

Nguyen

Ramanujan

2010

Macro Chemistry & Physics

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Magnet‐polymer (Magpol) composites have an interesting ability to undergo large strains in response to an external magnetic field. The contraction behavior of composites of silicone and micron sized iron particles induced by an external magnetic field was studied. Simply by changing boundary conditions, Magpol can exhibit shape change from axial contraction to a novel coiling mechanism due to buckling. The analytically predicted magnetic fields for buckling agreed well with the measured values. The strain versus magnetic field relationship suggested that postbuckling behavior is a stable symmetric bifurcation, which is useful for continuous actuation. The coiling mode of Magpol exhibited high actuation strain (up to 60%) and actuation stress (up to 184 kPa), thus shows good potential for use in soft actuators.magnified image

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Compression properties of magnetostrictive polymer composite gels

Cited by 83 publications

References 8 publications

Large-strain behaviour of Magneto-Rheological Elastomers tested under uniaxial compression and tension, and pure shear deformations

Large-strain behaviour of Magneto-Rheological Elastomers tested under uniaxial compression and tension, and pure shear deformations

Effect of the elastomer stiffness and coupling agents on rheological properties of magnetorheological elastomers

Novel Coiling Behavior in Magnet‐Polymer Composites

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