磁流变胶泥流变学特性测试装置研究

现有的商用磁流变仪不能满足磁流变胶泥高剪切率和高剪切应力测试的要求,对比设计了密闭圆筒剪切模式的磁流变胶泥流变特性测试装置。在完成总体结构设计的基础上,建立了剪切通道励磁磁路的分析模型,得出了剪切通道磁场强度与励磁电流的关系,并进行了有限元仿真验证。考虑转子与外筒存在倾斜,建立了磁流变胶泥转矩传递的力学模型,得到了转子与外筒倾斜角度与传递转矩误差的理论关系。完成了测量装置样机的制作,开展了磁流变胶泥流变学特性测试,在低剪切率下测量装置测试结果与安东帕流变仪测试结果能较好吻合。研究表明,测试装置能够实现25 000 s-1的高剪切率和200 k Pa的高剪切应力测试。

Study on testing device for rheological properties of magneto rheological glues

The existing commercial rheometer cannot satisfy the demand of the high shear rate and stress data of Magneto rheological glue. To solve this problem, a testing device with airtight cylinder shear mode is designed to measure the parameters of Magneto rheological Glues in this study. Based on the overall structural design, the relationship of the exciting current and the magnetic field is obtained by establishing the analytical model of magnetic circuit in shear channel. The relationship is verified by the finite element simulation. Considering the tilt between the rotor and outer cylinder, the torque transmission mechanical model is proposed to get the theoretical relationship between the incline angle and the error of torque transmission. The prototype of testing device is fabricated and the tests for Magneto rheological glue are executed. The experimental data by testing device agree with those by Anton Paar rheometer at the low shear rates. It shows that the test device can reach the measurement with high shear rate of 25 000 s-1 and high shear stress of 200 kPa.