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Importance of matrix inelastic deformations in the initial response of magnetic elastomers
Soft Matter ( IF 3.4 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1039/c7sm02366a
Pedro A. Sánchez 1, 2, 3, 4, 5 , Thomas Gundermann 6, 7, 8, 9 , Alla Dobroserdova 4, 5, 10 , Sofia S. Kantorovich 1, 2, 3, 4, 5 , Stefan Odenbach 6, 7, 8, 9
Affiliation  

Being able to predict and understand the behaviour of soft magnetic materials paves the way to their technological applications. In this study we analyse the magnetic response of soft magnetic elastomers (SMEs) with magnetically hard particles. We present experimental evidence of a difference between the first and next magnetisation loops exhibited by these SMEs, which depends non-monotonically on the interplay between the rigidity of the polymer matrix, its mechanical coupling with the particles, and the magnetic interactions in the system. In order to explain the microstructural mechanism behind this behaviour, we used a minimal computer simulation model whose results evidence the importance of irreversible matrix deformations due to both translations and rotations of the particles. To confirm the simulation findings, computed tomography (CT) was used. We conclude that the initial exposure to the field triggers the inelastic matrix relaxation in the SMEs, as particles attempt to reorient. However, once the necessary degree of freedom is achieved, both the rotations and the magnetisation behaviour become stationary. We expect this scenario not only to be limited to the materials studied here, but also to apply to a broader class of hybrid SMEs.

中文翻译:

基质弹性变形在磁性弹性体初始响应中的重要性

能够预测和理解软磁材料的行为为它们的技术应用铺平了道路。在这项研究中,我们分析了具有硬磁性颗粒的软磁弹性体(SME)的磁响应。我们提供了这些中小型企业展示的第一个磁化回路和下一个磁化回路之间差异的实验证据,该差异非单调地取决于聚合物基体的刚度,其与颗粒的机械耦合以及系统中的磁相互作用之间的相互作用。为了解释此行为背后的微观结构机制,我们使用了最小的计算机仿真模型,该模型的结果证明了由于粒子的平移和旋转而引起的不可逆基体变形的重要性。为了确认模拟结果,使用计算机断层扫描(CT)。我们得出的结论是,当粒子试图重新定向时,最初暴露于磁场会触发SME中的非弹性基质松弛。但是,一旦达到必要的自由度,旋转和磁化行为都会变得静止。我们希望这种情况不仅限于此处研究的材料,而且还将适用于更广泛的混合型中小企业。
更新日期:2018-02-12
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