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The magnetic field dependent dynamic properties of magnetorheological elastomers based on hard magnetic particles

机译：基于硬磁性颗粒的磁流变弹性体的磁场依赖性动态性能

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摘要

In this study, novel magnetorheological elastomers based on hard magnetic particles (H-MREs) were developed and the magnetic field dependent dynamic properties of the H-MREs were further investigated. The storage modulus of H-MREs could not only be increased by increasing magnetic field but also be decreased by the increasing magnetic field of opposite orientation. For the anisotropic H-MREs with 80 wt% NdFeB particles, the field-induced increasing and decreasing modulus was 426 kPa and 118 kPa respectively. Moreover, the dynamic performances of H-MREs significantly depended on the pre-structure magnetic field, magnetizing field and test magnetic field. The H-MREs were initially magnetized and formed the chain-like microstructure by the pre-structure magnetic field. The field-induced increasing and decreasing modulus of H-MREs both raised with increasing of the magnetizing field. When the magnetizing field increased from 400 to 1200 kA m(-1), the field induced decreasing modulus of the 80 wt% isotropic H-MREs raised from 3 to 47 kPa. The magnetic field dependent curves of H-MREs' storage modulus were asymmetric if the magnetizing field was higher than the test magnetic field. Based on the dipolar model of MREs and magnetic properties of hard magnetic material, a reasonable explanation was proposed to understand the H-MREs' field dependent mechanical behaviors.
机译：在该研究中，开发了基于硬磁性颗粒（H-MRE）的新型磁流变弹性体，进一步研究了H-MRE的磁场依赖性动态性质。 H-MRE的储存模量不能通过增加磁场来增加，但也可以通过相反方向的增加的磁场减小。对于具有80wt％NdFeB颗粒的各向异性H-MR，分别诱导的增加和降低的模量分别为426kPa和118kPa。此外，H-MRE的动态性能显着依赖于预结构磁场，磁化场和试验磁场。 H-MRE最初通过预结构磁场磁化并形成链状微结构。随着磁化场的增加，H-MR培养的现场诱导的增加和降低模量。当磁化场从400升至1200ka m（-1）时，该场诱导从3至47kPa升高的80wt％各向同性H-MR升的模量降低。如果磁化场高于测试磁场，则H-MRES储存模量的磁场依赖性曲线是不对称的。基于硬磁材料的MRS和磁性的偶极模型，提出了合理的解释，以了解H-MRES的场依赖性机械行为。

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