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根据磁性颗粒的偶极子理论,建立了磁性颗粒的三维动力学模型,模拟了三维状态下磁流变液磁性颗粒成链的过程,对影响成链速度的因素如磁场强度等进行了分析,结果表明:静态磁流变液的成链速度与磁性颗粒的体积分数、颗粒的大小及磁场强度成正比。对剪切速率为200s-1时磁流变液的动态特性进行仿真,结果发现:磁性链条处于一种动态平衡,但支链明显增多,导致剪切屈服应力下降。
According to the dipole theory of magnetic particles, a three-dimensional dynamic model of magnetic particles was established to simulate the process of magnetic particles into chains in the state of three-dimensional magneto-rheological fluid. The factors that affect the chain speed such as magnetic field strength were analyzed. The results show that the rate of chain formation of static MRF is proportional to the volume fraction of magnetic particles, particle size and magnetic field strength. The simulation of the dynamic properties of MR fluids at a shear rate of 200s-1 shows that the magnetic chain is in a kind of dynamic equilibrium, but the branch chain increases obviously, resulting in the decrease of shear yield stress.