Friction and wear characteristics of magnetorheological elastomer under vibration conditions

Lian, Chenglong; Lee, Kwang-Hee; Lee, Chulhee

doi:10.1016/j.triboint.2016.02.037

Cited by 33 publications

(27 citation statements)

References 16 publications

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“…Comparing with the initial roughness Ra = 1.67 µm, the roughness of the MRE is decreased. The simulation results are consistent with previous experimental observations (Lian et al, 2015(Lian et al, , 2016Li et al, 2018) where the magnetic fields reduce the friction coefficient of MREs. However, when we evaluate the relative roughness changes as a function of the initial surface roughness of MREs, the magnetic fields do not always induce negative changes in surface roughness.…”

Section: Simulation Results and Discussionsupporting

confidence: 91%

“…Lee et al (2013) employed a homemade linear sliding tester to evaluate the friction characteristics of MREs, and found that the friction coefficient of MRE decreased with the external magnetic field. Later, the same group (Lian et al, 2015(Lian et al, , 2016) applied a reciprocating friction tester to characterize four MRE samples, which were prepared by embedded particles in different matrix materials, and found the same phenomenon for all test conditions. The authors argued that the friction reduction of MREs under a magnetic field was due to the field-stiffening effect.…”

Section: Introductionmentioning

confidence: 94%

“…Recently, several experimental studies (Lee et al, 2013;Lian et al, 2015Lian et al, , 2016Li et al, 2018) have shown that the tribological properties of MREs also change with external magnetic fields, which would possibly extend the MRE's application in interfacial friction control. However, the mechanism of field-induced friction behavior of MREs is still unclear.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2018

Front. Mater.

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In this work, we propose mesoscopic model to investigate the surface micro structures of magnetorheological elastomers (MREs) under a magnetic field. By comparing the surface roughness changes of MREs, we found that the surface micro-deformation of MREs, not the field-induced hardness, mainly accounts for the controllable friction characteristics of MREs. The results also demonstrate that the field-induced friction of MREs depends on the particle contents as well as the initial surface roughness. The model predicts that the maximum relative roughness change of MREs occurs when the MRE has particle volume fraction of around 9%, which is validated by experimental results.

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Section: Simulation Results and Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2018

Front. Mater.

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“…They found that the hardness of all MRE samples increased to varying degrees after application of the magnetic field, resulting in a change in the friction and wear characteristics of MRE. In addition, Lian et al [17,18] have also carried out experiments to study the effects of some external environmental factors on the friction characteristics of MRE. The research shows that vibration, temperature, and relative humidity all affect the friction characteristics of MRE.…”

Section: Introductionmentioning

confidence: 99%

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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“…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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Friction and wear characteristics of magnetorheological elastomer under vibration conditions

Cited by 33 publications

References 16 publications

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

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

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

Effect of Material Composition on Tunable Surface Roughness of Magnetoactive Elastomers

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