Transverse isotropy in magnetoactive elastomers

Chougale, Sanket; Romeis, Dirk; Saphiannikova, Marina

doi:10.1016/j.jmmm.2020.167597

Cited by 17 publications

(32 citation statements)

References 33 publications

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“…MAEs can also alter the material parameters such as elastic and shear moduli in the magnetic field. For instance, the field-induced increase and decrease in the elastic modulus of MAEs with respect to the orientation of the applied magnetic field are recently predicted [ 15 ]. The wide variety of applications of MAEs makes it crucially important to understand mechanics triggering the change in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

2021

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Magnetoactive elastomers (MAEs) claim a vital place in the class of field-controllable materials due to their tunable stiffness and the ability to change their macroscopic shape in the presence of an external magnetic field. In the present work, three principal geometries of shear deformation were investigated with respect to the applied magnetic field. The physical model that considers dipole-dipole interactions between magnetized particles was used to study the stress-strain behavior of ellipsoidal MAEs. The magneto-rheological effect for different shapes of the MAE sample ranging from disc-like (highly oblate) to rod-like (highly prolate) samples was investigated along and transverse to the field direction. The rotation of the MAE during the shear deformation leads to a non-symmetric Cauchy stress tensor due to a field-induced magnetic torque. We show that the external magnetic field induces a mechanical anisotropy along the field direction by determining the distinct magneto-mechanical behavior of MAEs with respect to the orientation of the magnetic field to shear deformation.

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Section: Introductionmentioning

confidence: 99%

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

2021

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“…The presence of external magnetic field transforms initially isotropic MAE samples into transversely isotropic ones with an axis of symmetry defined by the direction of magnetic field. Uniaxial deformations applied along and perpendicular to the field direction lead to a strong anisotropy in the magnetically induced stress response, as predicted in a very recent work [80]. In this study, an attempt was made to derive an effective material model from the free energy functional based on the dipole approximation for magnetic interactions.…”

Section: Effective Macroscopic Behavior-minimum Of Global Energymentioning

confidence: 77%

Magneto-Mechanical Coupling in Magneto-Active Elastomers

et al. 2021

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In the present work, the magneto-mechanical coupling in magneto-active elastomers is investigated from two different modeling perspectives: a micro-continuum and a particle–interaction approach. Since both strategies differ significantly in their basic assumptions and the resolution of the problem under investigation, they are introduced in a concise manner and their capabilities are illustrated by means of representative examples. To motivate the application of these strategies within a hybrid multiscale framework for magneto-active elastomers, their interchangeability is then examined in a systematic comparison of the model predictions with regard to the magneto-deformation of chain-like helical structures in an elastomer surrounding. The presented results show a remarkable agreement of both modeling approaches and help to provide an improved understanding of the interactions in magneto-active elastomers with chain-like microstructures.

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“…Figure 2b shows the same values of We at which transition from deposition to splashing occurs, but this time plotted versus the Young's modulus E of the MAE substrates. The values of the latter were calculated from the data on shear storage modulus as a function of B (described in the Experimental Section) by assuming that MAEs are incompressible neo–Hookean solids, for which E = 3G , [ 42 ] and taking the low‐frequency shear storage modulus G ′ as a reasonable approximation for static G . Here, only the lines corresponding to 50% probability of splashing are shown for clarity.…”

Section: Resultsmentioning

confidence: 99%

Tunable Drop Splashing on Magnetoactive Elastomers

Kravanja

Belyaeva

Hribar

et al. 2021

Adv Materials Inter

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The significant effect of an external dc magnetic field on the splashing behavior of ethanol drops impacting on the unstructured (flat) surface of soft magnetoactive elastomers (MAEs) is reported. The Weber number corresponding to the transition between the deposition and the splashing regime is reduced by ≈20% in a moderate magnetic field of ≈300 mT. Alongside this effect, a two‐fold increase of the initial deceleration of the ejection sheet is observed for the softest sample. The main underlying mechanism for the observed phenomena is believed to be the magnetic‐field‐induced stiffening of the MAEs. Further possible mechanisms are magnetically induced changes in the surface roughness and magnetic‐field‐induced plasticity (magnetic shape memory effect). The potential application areas are magnetically regulable wetting and magneto‐responsive surfaces for controlling the drop splashing.

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Transverse isotropy in magnetoactive elastomers

Cited by 17 publications

References 33 publications

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

Magneto-Mechanical Coupling in Magneto-Active Elastomers

Tunable Drop Splashing on Magnetoactive Elastomers

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