Magnetic Field Induced Surface Micro-Deformation of Magnetorheological Elastomers for Roughness Control

Chen, Shiwei; Li, Rui; Li, Xi; Wang, Xiaojie

doi:10.3389/fmats.2018.00076

Cited by 13 publications

(9 citation statements)

References 30 publications

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“…By varying the particle number, different particle volume fractions can be achieved. Because of the preparation with an unsmoothed mold, the surface of MRE exhibits a certain roughness, which can be confirmed by our previous study [23]. Therefore, the initial surface microstructure of MRE should be considered in the study of surface morphology changes under the magnetic field.…”

Section: Development Of the Finite Element (Fe) Modelsupporting

confidence: 66%

“…Recently, some researchers [19][20][21][22] have found that the surface microstructures of MRE will change under the influence of the magnetic field, which provides a new idea for exploring the mechanism of magnetroncontrolled friction of MRE. In previous studies [23], we found that the surface roughness of MRE would change under the action of the magnetic field. However, the observation of MRE surface topography is only from a two-dimensional perspective; thus, the discussion about which factors affect the change trend of roughness is not comprehensive.…”

Section: Introductionmentioning

confidence: 74%

“…Previous experimental studies [23] have shown that the initial surface roughness of MRE is 2-3 μm. The width of the rough surfaces to be modeled is limited to 150 μm, based on Eqs.…”

Section: Development Of the Finite Element (Fe) Modelmentioning

confidence: 90%

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Experimental and numerical study on surface roughness of magnetorheological elastomer for controllable friction

et al. 2019

Friction

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Magnetorheological elastomer (MRE) is a type of smart material of which mechanical and electrical properties can be reversibly controlled by the magnetic field. In this study, the influence of the magnetic field on the surface roughness of MRE was studied by the microscopic modeling method, and the influence of controllable characteristics of the MRE surface on its friction properties was analyzed by the macroscopic experimental method. First, on the basis of existing studies, an improved mesoscopic model based on magnetomechanical coupling analysis was proposed. The initial surface morphology of MRE was characterized by the W-M fractal function, and the change process of the surface microstructures of MRE, induced by the magnetic interaction between particles, was studied. Then, after analyzing the simulation results, it is found that with the increase in the magnetic field and decrease in the modulus of rubber matrix, the surface of MRE changes more significantly, and the best particle volume fraction is within 7.5%-9%. Furthermore, through experimental observation, it is found that the height of the convex peak on the surface of MRE decreases significantly with the action of the magnetic field, resulting in a reduction in the surface roughness. Consistent with the simulation results, a particle volume fraction of 10% corresponds to a maximum change of 14%. Finally, the macroscopic friction experiment results show that the friction coefficients of MREs with different particle volume fractions all decrease with the decrease in surface roughness under the magnetic field. When the particle volume fraction is 10%, the friction coefficient can decrease by 24.7% under a magnetic field of 400 mT, which is consistent with the trend of surface roughness changes. This shows that the change in surface morphology with the effect of the magnetic field is an important factor in the control of MRE friction properties by magnetic field.

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Section: Development Of the Finite Element (Fe) Modelsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 74%

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Experimental and numerical study on surface roughness of magnetorheological elastomer for controllable friction

et al. 2019

Friction

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“…The mechanical properties and magnetic controlled deformation of MR materials have been systematically investigated. Due to the tunable mechanical characteristics, MR materials have been widely used in vibration control (Fu et al, 2016;Liu et al, 2019b;Zhang et al, 2019), magnetic sensing (Ding et al, 2018;Ren et al, 2018;Hu et al, 2020), magnetic controlled movement (Lum et al, 2016;Chen et al, 2018;Ubaidillah et al, 2019) and robot manufacturing (Eric et al, 2014;Feng et al, 2017;Vien et al, 2019). In consideration of their easy deformation, tunable mechanical properties and contactless magnetic actuation, the MR materials are expected to have wonderful performance in sound absorption.…”

Section: Introductionmentioning

confidence: 99%

Deformation Dependent Sound Absorption Property of a Novel Magnetorheological Membrane Sound Absorber

Sun

Cao

Zhou³

et al. 2020

Front. Mater.

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A novel membrane sound absorber based on the magnetorheological membrane (MRM) is developed for active sound absorption. Due to its good flexibility and stretch-ability, the MRM consisting of carbonyl iron particles (CIPs) and polydimethylsiloxane elastomer matrix can be easily deformed. The deformation of MRM is investigated by the digital image correlation method. The off-plane displacement is positively related to both of the CIPs mass fractions and magnetic field strength. The sound absorption performance of MRM sound absorber is investigated and it is found that the thickness of the membrane, CIPs mass fractions, and air cavity length behind the membrane significantly influence the sound absorption performance. The magnetic field can adjust the sound absorption frequency without affecting the high acoustical absorption coefficients. The double-layer membrane structure has two sound absorption peaks within the testing frequency range and further improves the frequency adjustability of the sound absorber. Therefore, it is expected to be a particularly promising alternative for active sound absorption. Finally, the numerical solutions calculated by the equivalent circuit method also support the experimental results.

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“…Very recently, the surface properties of MAEs have attracted the attention of several research groups, as it was demonstrated that they can be strongly modulated by applied magnetic fields as well [32,33,34,35,36,37,38,39,40,41]. This interest is driven by a large number of potential applications, ranging from magnetically controllable hydrophobic coatings [33] and biomedical substrates [42] to magnetically reconfigurable diffractive optical elements [34].…”

Section: Introductionmentioning

confidence: 99%

Effect of Material Composition on Tunable Surface Roughness of Magnetoactive Elastomers

et al. 2019

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We investigated magnetic-field-induced modifications of the surface roughness of magnetoactive elastomers (MAEs) with four material compositions incorporating two concentrations of ferromagnetic microparticles (70 wt% and 80 wt%) and exhibiting two shear storage moduli of the resulting composite material (about 10 kPa and 30 kPa). The analysis was primarily based on spread optical reflection measurements. The surfaces of all four materials were found to be very smooth in the absence of magnetic field (RMS roughness below 50 nm). A maximal field-induced roughness modification (approximately 1 μm/T) was observed for the softer material with the lower filler concentration, and a minimal modification (less than 50 nm/T) was observed for the harder material with the higher filler concentration. All four materials showed a significant decrease in the total optical reflectivity with an increasing magnetic field as well. This effect is attributed to the existence of a distinct surface layer that is depleted of microparticles in the absence of a magnetic field but becomes filled with particles in the presence of the field. We analyzed the temporal response of the reflective properties to the switching on and off of the magnetic field and found switching-on response times of around 0.1 s and switching-off response times in the range of 0.3–0.6 s. These observations provide new insight into the magnetic-field-induced surface restructuring of MAEs and may be useful for the development of magnetically reconfigurable elastomeric optical surfaces.

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Magnetic Field Induced Surface Micro-Deformation of Magnetorheological Elastomers for Roughness Control

Cited by 13 publications

References 30 publications

Experimental and numerical study on surface roughness of magnetorheological elastomer for controllable friction

Experimental and numerical study on surface roughness of magnetorheological elastomer for controllable friction

Deformation Dependent Sound Absorption Property of a Novel Magnetorheological Membrane Sound Absorber

Effect of Material Composition on Tunable Surface Roughness of Magnetoactive Elastomers

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