Magnetic-field-induced stress in confined magnetoactive elastomers.,Soft Matter

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Magnetic-field-induced stress in confined magnetoactive elastomers.
Soft Matter ( IF 2.9 ) Pub Date : 2020-09-07 , DOI: 10.1039/d0sm01337d
D Romeis ₁ , S A Kostrov ₂ , E Yu Kramarenko ₃ , G V Stepanov ₄ , M Shamonin ₅ , M Saphiannikova ₁

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We present a theoretical approach for calculating the state of stress induced by a uniform magnetic field in confined magnetoactive elastomers of arbitrary shape. The theory explicitly includes the magnetic field generated by magnetizable spherical inclusions in the sample interior assuming a non-linear magnetization behavior. The initial spatial distribution of particles and its change in an external magnetic field are considered. This is achieved by the introduction of an effective demagnetizing factor where both the sample shape and the material microstructure are taken into account. Theoretical predictions are fitted to the stress data measured using a specifically designed experimental setup. It is shown that the theory enables the quantification of the effect of material microstructure upon introducing a specific microstructural factor and its derivative with respect to the extensional strain in the undeformed state. The experimentally observed differences between isotropic and anisotropic samples, compliant and stiff elastomer matrices are explained.

中文翻译：

受限磁活性弹性体中的磁场感应应力。

我们提出了一种计算任意形状的受限磁活性弹性体中均匀磁场引起的应力状态的理论方法。该理论明确包括假设非线性磁化行为的样品内部可磁化球形夹杂物产生的磁场。考虑了粒子的初始空间分布及其在外部磁场中的变化。这是通过引入有效的退磁因子来实现的，其中考虑了样品形状和材料微观结构。理论预测与使用专门设计的实验装置测量的应力数据相吻合。结果表明，该理论能够通过引入特定的微观结构因素及其相对于未变形状态下的拉伸应变的导数来量化材料微观结构的影响。解释了实验观察到的各向同性和各向异性样品、柔顺和刚性弹性体基质之间的差异。

更新日期：2020-10-15

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