分析磁流变流体屈服应力微观力学模型

剪切屈服应力是磁流变流体固化强度的重要指标之一,具有重要的工程意义。基于磁性物理学理论,从磁流变流体在磁场作用下铁磁性固体颗粒极化成链的微观结构出发,探讨磁流变流体中固体颗粒间的相互作用机理,分析研究颗粒间的相互作用力,建立了一种微观力学模型,可用于分析磁流变流体在外加磁场作用下屈服应力及其影响因素的作用效果,揭示磁流变效应的微结构机理,为磁流变流体的性能优化、工程开发及应用磁流变流体提供理论依据。

Model for the Yield Stress of Magnetorheological Fluids

The magnitude of the yield stress of magnetorheological fluids is important for engineering applications. Based on the magnetomechanics, the microstructure of chains consisting of polarized particles, and the interaction between particles, the shear stress distribution contributed by a single chain of polarized particles is formulated, and then the yield stress of magnetorheological fluids is obtained under the assumption that the distribution of chains tends normally. The effects of the applied magnetic field intensity, the size of the particles, and the volume fraction of the particles on the macroscopic yield stress are analyzed. The proposed model is capable of analyzing the effects of other influencing factors on the yield criterion of MRFs, which may assist the design and development of high-performance MRFs.