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Stress relaxation behavior of isotropic and anisotropic magnetorheological elastomers
Continuum Mechanics and Thermodynamics ( IF 2.6 ) Pub Date : 2022-04-08 , DOI: 10.1007/s00161-022-01097-5
Tran Huu Nam , I. Petríková , B. Marvalová

The paper presents an experimental study and numerical simulation of stress relaxation behavior of isotropic and anisotropic magnetorheological elastomers (MREs) made from silicone rubber filled with micro-sized carbonyl iron powder. Effects of applied constant strains and magnetic fields of an electromagnet on the stress relaxation of the MREs were investigated for 10 h using the single relaxation test with double-lap shear samples. The isotropic MRE showed a linearly elastic behavior, while the anisotropic MRE indicated a highly nonlinear elastic response. The shear stress and relaxation modulus of anisotropic MRE are much higher than those of isotropic MRE. The shear stress of the MREs increased with increasing the constant strain, while their relaxation modulus decreased. The shear stress and relaxation modulus of the MREs within the first 0.25 h boosted with raising the magnetic flux density to about 0.5 T. However, the shear stress and relaxation modulus of the MREs under strong magnetic fields declined considerably after 0.25 h testing. This reduction was attributed to the temperature rise in the MRE samples caused by the heating of the electromagnet. The stress relaxation behavior of the MREs was examined using a four-parameter fractional derivative model. The model parameters were obtained by fitting the relaxation modulus to the measured data of the MREs. The shear stress and relaxation modulus with long-term predictions estimated from the studied model were in good agreement with the measured data for the MREs at various applied strains and under low magnetic fields. The model-predicted values did not agree well with the experimental data of the MREs under high magnetic fields because of the sample temperature gain caused by heat generation of the electromagnet. Therefore, the investigated model can be used to predict the long-term relaxation stress of the MREs under high magnetic fields of permanent magnets.



中文翻译:

各向同性和各向异性磁流变弹性体的应力松弛行为

本文介绍了由填充有微米级羰基铁粉的硅橡胶制成的各向同性和各向异性磁流变弹性体 (MRE) 的应力松弛行为的实验研究和数值模拟。使用双搭接剪切样品的单次松弛试验研究了施加的恒定应变和电磁体磁场对 MRE 应力松弛的影响 10 小时。各向同性 MRE 表现出线性弹性行为,而各向异性 MRE 表现出高度非线性的弹性响应。各向异性 MRE 的剪切应力和松弛模量远高于各向同性 MRE。MRE的剪切应力随着恒定应变的增加而增加,而它们的松弛模量减小。前 0 内 MRE 的剪切应力和松弛模量。25 h 随着磁通密度提高到 0.5 T 左右,MRE 在强磁场下的剪切应力和弛豫模量在 0.25 h 测试后显着下降。这种降低归因于电磁铁加热引起的 MRE 样品的温度升高。使用四参数分数导数模型检查 MRE 的应力松弛行为。通过将松弛模量拟合到 MRE 的测量数据来获得模型参数。从研究模型估计的具有长期预测的剪切应力和松弛模量与 MRE 在各种应用应变和低磁场下的测量数据非常一致。由于电磁体发热引起的样品温度增益,模型预测值与高磁场下 MRE 的实验数据不太吻合。因此,所研究的模型可用于预测永磁体高磁场下 MRE 的长期弛豫应力。

更新日期:2022-04-08
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