Experimental and numerical research of stress relaxation behavior of magnetorheological elastomer

Nam, Tran Huu; Petríková, Iva; Marvalová, Bohdana

doi:10.1016/j.polymertesting.2020.106886

Cited by 24 publications

(15 citation statements)

References 42 publications

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“…The microstructural morphology of micro-sized CIPs and their diameter as a function of the volume fraction in overall distribution were presented in our earlier papers. [10][11][12] Fabrication of isotropic SRC samples Fabrication of isotropic cylindrical SRC samples is depicted hereinafter. First of all, the silicone rubber ZA13 mixed with its catalyst in the mass ratio of 1:1.…”

Section: Methodsmentioning

confidence: 99%

“…There has been a lot of research focusing on the investigation of changing the dynamic and rheological properties of MREs in the presence of a magnetic field. [1][2][3][4][5][10][11][12][13][14][15] However, the examination of varying the performance and life of MREs due to heat generation and temperature rise under dynamic loadings was rare and inadequate. 16,17 Moreover, the scientific problem is the impact of heat generation in SRC structures under cyclic loadings on their dynamic mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical behavior of viscoelastic materials depended powerfully on several factors such as temperature, excitation frequency, amplitude, loading rate, etc. [10][11][12][13][30][31][32][33] Besides, the self-heating characteristic in the structures made of viscoelastic materials was dependent on their properties and loading conditions like static preload, frequency, and amplitude. [21][22][23][34][35][36] Cazenove et al 21 showed that the temperature inside the viscoelastic damper under the shear harmonic loading increases considerably with increasing the excitation frequency and amplitude, resulting in a huge decrease in the damping capacity of the damper.…”

Section: Introductionmentioning

confidence: 99%

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Self-heating and dynamic mechanical behavior of silicone rubber composite filled with carbonyl iron particles under cyclic compressive loading

Nam

Petríková

Marvalová

et al. 2021

Journal of Composite Materials

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Self-heating and dynamic mechanical behavior of isotropic silicone rubber composite (SRC) filled with micro-sized carbonyl iron particles (CIPs) subjected to cyclic compressive loading have been studied. Effects of pre-strains from 5 to 20%, strain amplitudes from 1 to 5%, and excitation frequencies from 10 to 50 Hz on the self-heating and dynamic mechanical response of the isotropic SRC were investigated. The self-heating temperatures were measured on the surface and at the center of cylindrical SRC specimens. The self-heating temperatures of the isotropic SRC samples showed a fast increase in an initial transient stage and the following isothermal stage. The temperature distribution in the isotropic SRC specimens was non-homogeneous and the temperature decreased from the center to sample edges. The self-heating temperatures of the isotropic SRC increased gradually with raising the strain amplitude and frequency. However, the difference between the internal and surface temperatures was slight for low strain amplitudes and frequencies, while it was significant for high strain amplitudes and frequencies. The temperatures of the isotropic SRC boosted rapidly with increasing the pre-strain to 10% and thereafter gained slightly. Although the isotropic SRC dynamic moduli reduced with the rise of the strain amplitude, they enhanced with increasing the pre-strain and frequency. Besides, the storage modulus of the isotropic SRC varied slightly with time, while the loss modulus reduced markedly especially at the initial period. The decrease in the loss modulus of the isotropic SRC under cyclic compressive loading is attributed to its self-heating temperature rise. A finite element simulation of the heat transfer in the SRC cylinder was conducted. The calculated temperatures in the SRC cylinder were in good agreement with the measured ones at different strain amplitudes and frequencies.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-heating and dynamic mechanical behavior of silicone rubber composite filled with carbonyl iron particles under cyclic compressive loading

Nam

Petríková

Marvalová

et al. 2021

Journal of Composite Materials

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“…Additionally, it is very important to demonstrate the rheological behavior of MREs, particularly the time-dependent rheological nature of MRE and stress releases under constant strain, known as stress relaxation properties in detail microscopic analysis, in order to design a material that has good durability. Stress relaxation tests are, therefore, important to demonstrate the rheological viscoelastic behavior of MRE durability and to provide guidance on their application [ 20 ]. Previously, studies related to stress relaxation have attracted significant critical interest in natural rubber, modified rubber, nanocomposites, and amorphous solid [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, studies related to stress relaxation have attracted significant critical interest in natural rubber, modified rubber, nanocomposites, and amorphous solid [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. However, in the stress relaxation investigation based on MRE, only a few have been published [ 20 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

An Insight into Amorphous Shear Band in Magnetorheological Solid by Atomic Force Microscope

et al. 2021

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Micro mechanism consideration is critical for gaining a thorough understanding of amorphous shear band behavior in magnetorheological (MR) solids, particularly those with viscoelastic matrices. Heretofore, the characteristics of shear bands in terms of formation, physical evolution, and response to stress distribution at the localized region have gone largely unnoticed and unexplored. Notwithstanding these limitations, atomic force microscopy (AFM) has been used to explore the nature of shear band deformation in MR materials during stress relaxation. Stress relaxation at a constant low strain of 0.01% and an oscillatory shear of defined test duration played a major role in the creation of the shear band. In this analysis, the localized area of the study defined shear bands as varying in size and dominantly deformed in the matrix with no evidence of inhibition by embedded carbonyl iron particles (CIPs). The association between the shear band and the adjacent zone was further studied using in-phase imaging of AFM tapping mode and demonstrated the presence of localized affected zone around the shear band. Taken together, the results provide important insights into the proposed shear band deformation zone (SBDZ). This study sheds a contemporary light on the contentious issue of amorphous shear band deformation behavior and makes several contributions to the current literature.

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Controllable construction of cross‐linking network for regulating on the mechanical properties of polydimethylsiloxane and polydimethylsiloxane/carbon nanotubes composites

Cai

Huang

Chen

et al. 2021

J of Applied Polymer Sci

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Herein, the cross‐linking density was adjusted controllably by tuning the curing reaction to gain polydimethylsiloxane (PDMS) elastomers with different mechanical performances. First of all, the cross‐linking network of PDMS was adjusted by tuning the parameters of the fabrication process such as curing temperature, curing time, and component ratio. Lowering the temperature, shortening the curing time, and using less curing agent were discovered to effectively reduce the cross‐linking density. Then, the effects of important factors on cross‐linking density, including the fabrication process, the time for post‐curing, and the content of carbon nanotube (CNT), were thoroughly discussed. Furthermore, the dynamic mechanical performance, mechanical characteristics, and viscoelastic properties of PDMS and PDMS/CNT composites were studied based on the regulation of the cross‐linking network. The stronger the cross‐linking density, the higher the storage modulus, the greater the restriction on the molecular chain of silicone rubber. Besides, the post‐curing for 5 months and the introduction of CNT fillers appeared to be a viable option for promoting the cross‐linking reaction with higher density and thereby strengthening the mechanical properties of PDMS.

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Experimental and numerical research of stress relaxation behavior of magnetorheological elastomer

Cited by 24 publications

References 42 publications

Self-heating and dynamic mechanical behavior of silicone rubber composite filled with carbonyl iron particles under cyclic compressive loading

Self-heating and dynamic mechanical behavior of silicone rubber composite filled with carbonyl iron particles under cyclic compressive loading

An Insight into Amorphous Shear Band in Magnetorheological Solid by Atomic Force Microscope

Controllable construction of cross‐linking network for regulating on the mechanical properties of polydimethylsiloxane and polydimethylsiloxane/carbon nanotubes composites

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