Magnetorheological fluid is a kind of intelligent material with a controllable state. It has three working modes: valve mode, shear, and squeeze. The squeeze mode can produce greater response under the external excitation conditions, with significant application potential and advantages. In this paper, a magnetorheological fluid squeeze performance test device was designed, and the squeeze experiments under different magnetic field strengths and loading speed conditions were implemented, and then the MRF squeeze flow theory model was established, which is the key factor affecting the squeeze force are revealed. The experimental results show that the squeeze force change trend presents three stages, of which the first stage represents the state before yielding; the loading speed has a significant effect on the change of the squeeze force curves, especially around 1 mm/s, the squeeze force curves show different development trends. Through theoretical analysis, it is concluded that loading speed, magnetic field change gradient, and magnetorheological fluid dynamic yield strength are the key factors affecting the squeeze force, which provide basic theoretical support for the evaluation and research application of the extrusion performance of magnetic material.

磁流变流体是一种状态可控的智能材料。它具有三种工作模式：阀门模式，剪切和挤压。挤压模式可以在外部激励条件下产生更大的响应，具有巨大的应用潜力和优势。本文设计了一种磁流变液挤压性能试验装置，并进行了在不同磁场强度和加载速度条件下的挤压实验，建立了MRF挤压流动理论模型，这是影响挤压力的关键因素。被揭示。实验结果表明，挤压力的变化趋势呈现三个阶段，其中第一阶段代表屈服前的状态；第二阶段代表屈服前的状态。加载速度对挤压力曲线的变化有很大影响，尤其是在1 mm / s左右时，挤压力曲线显示出不同的发展趋势。通过理论分析得出结论，加载速度，磁场变化梯度和磁流变流体动态屈服强度是影响挤压力的关键因素，为磁性材料挤压性能的评价和研究应用提供了基础理论依据。