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首页> 外文期刊>Journal of intelligent material systems and structures >Reversible and non-reversible motion of NdFeB-particles in magnetorheological elastomers
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Reversible and non-reversible motion of NdFeB-particles in magnetorheological elastomers

机译：NdFeB-颗粒在磁流变弹性体中的可逆和不可逆转的运动

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Magnetorheological elastomers are a class of smart hybrid material where magnetic microparticles are embedded in an elastomer matrix. The combination of elastic and magnetic properties leads to highly complex material behaviour, which is strongly affected by the arrangement and the magnetically induced motion of the magnetic particles. Thus, the knowledge of the internal particle structure is key to gain a deeper understanding of the complex material behaviour. In this paper, X-ray microtomography was applied to analyse the internal particle structure of a magnetorheological elastomer containing magnetically hard NdFeB-particles. A stepwise magnetisation of the material enabled a detailed characterisation of the occurring non-reversible chain formation process. Furthermore, the application of magnetic fields during measurements enabled an analysis of a mostly reversible particle motion occurring in connection with the magnetorheological effect. The collected tomography data of the particle structure was evaluated on a single particle basis as well as by means of a direction-dependent pair correlation function. To provide a scale bridging between macroscopic and microscopic properties, the found results regarding the particle motion were linked to mechanical and magnetic properties of the material.
机译：磁流变弹性体是一类智能混合材料，其中磁性微粒嵌入弹性体基质中。弹性和磁性的组合导致高度复杂的材料行为，其受到磁性颗粒的布置和磁诱导的运动的强烈影响。因此，内部粒子结构的知识是对复杂材料行为的更深理解的关键。本文施加X射线显微镜映谱法分析含有磁力硬NdFeB-颗粒的磁流变弹性体的内部颗粒结构。该材料的逐步磁化使得能够详细表征发生的不可逆转链形成过程。此外，在测量过程中施加磁场使得能够分析与磁流变效应有关发生的最可逆的颗粒运动。通过方向依赖于方向对相关函数评估粒子结构的收集的粒子结构数据以及依赖于方向的对相关函数。为了提供宏观和微观性质之间的横向桥接，关于颗粒运动的发现结果与材料的机械和磁性相关。

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