制备了不同质量分数（50%，70%，80%）羰基铁粉的聚氨酯基磁流变胶（MRG），研究具有较宽剪切应力范围的MRG在不同磁感应强度、剪切速率、应变幅下的静态和动态剪切流变特性，并基于试验结果对Herschel-Bulkley本构模型参数进行了识别。结果表明：随着磁感应强度的增强，含质量分数80%羰基铁粉MRG的剪切应力范围最宽、磁流变效应最明显；含质量分数80%羰基铁粉MRG的屈服剪切应力随磁感应强度增强而增大，且不同磁感应强度下的动力学黏度都随着剪切速率的增大而减小；该MRG是一种具有屈服剪切应力以及剪切稀化特性的非牛顿流体，其流变特性满足Herschel-Bulkley剪切稀化模型；储能模量和损耗模量受剪切应变幅及磁感应强度的影响较大，而对频率的依赖性微弱；磁流变效应及线性黏弹性临界应变幅都随磁感应强度增强而增大；相比于剪切速率及应变幅，磁感应强度对法向应力的影响更显著。

Polyurethane-based magnetorheological gels (MRG) with different mass fractions of carbonyl iron powder (50%,70%,80%) were prepared. The static and dynamic shear rheological properties of the MRG with a wide shear stress range under different magnetic induction intensities, shear rates and strain amplitudes were studied, and Herschel-Bulkley constitutive model parameters were identified based on the test results. The results show that the shear stress of MRG with 80wt% carbonyl iron powder had the widest range, and megnetorheological effect was the most obvious. The yield shear stress of MRG with 80wt% carbon iron powder increased with the magnetic induction intensity; the kinetic viscosity at different magnetic induction intensities decreased with the increase of shear rate. The MRG was a non-Newtonian fluid with yield shear stress and shear thinning characteristics, and its rheological properties satisfied Herschel-Bulkley shear thinning model. The storage or loss modulus was greatly affected by the shear strain amplitude and magnetic induction intensity, but had a weak dependence on the frequency. The megnetorheological effect and linear viscoelastic critical strain amplitude both increased with the increase of magnetic induction intensity. The effect of magnetic induction intensity on normal stress was more significant than that of shear rate and shear strain amplitude.