Structural deformation in the low shear rate region that is an undeformed state is investigated for the isotropic and anisotropic magnetic particle–based magnetorheological (MR) fluid. Flow curves were obtained for both MR fluids between 0.1 s −1 and 500 s −1 in the absence and in the presence of magnetic fields. A model to describe the flow behavior over the full shear rate study is proposed. The proposed model accounts for the friction contribution coming from particle-particle as well as particle-carrier interactions of anisotropic particles particularly in flake-shaped particles. The parameters derived from the fit have physical meaning, and it correlates with the observed dependency in rheology study. To get a better understanding of particle-particle friction contribution, magnetic nanoparticles were added in the MR fluid and flow behavior is studied. The study clearly demonstrates the contribution of particle-particle friction on the MR properties. The contribution of particle-carrier friction, due to the shape of the particle, is verified by comparing the result with spherical-shaped particle–based MR fluid.

中文翻译：

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基于各向同性和各向异性粒子的 MR 流体的静态和动态屈服应力评估：建模和分析

针对基于各向同性和各向异性磁性颗粒的磁流变 (MR) 流体，研究了处于未变形状态的低剪切速率区域中的结构变形。在不存在和存在磁场的情况下，在0.1 s -1 和500 s -1 之间获得两种MR流体的流动曲线。提出了一个模型来描述整个剪切速率研究中的流动行为。所提出的模型解释了来自颗粒-颗粒以及各向异性颗粒的颗粒-载体相互作用的摩擦贡献，特别是在片状颗粒中。从拟合得出的参数具有物理意义，并且与流变学研究中观察到的相关性相关。为了更好地理解粒子-粒子摩擦贡献，将磁性纳米粒子添加到 MR 流体中并研究流动行为。该研究清楚地证明了粒子 - 粒子摩擦对 MR 特性的贡献。通过将结果与基于球形颗粒的 MR 流体进行比较，验证了由于颗粒形状而导致的颗粒-载体摩擦的贡献。