磁流变脂是继磁流变液和磁流变弹性体之后,又一个具有巨大发展潜力的磁流变智能材料。参照作者提出的圆形颗粒的建模过程,建立了非圆形磁性颗粒磁流脂的剪切应力模型,并以六边形磁性颗粒磁流变脂为例,推导出六边形磁性颗粒磁流变脂剪切应力公式。该模型对半径和边长相同时剪切屈服应力与磁场强度的关系,体积相同时剪切屈服应力与磁场强度的关系,零场下的剪切力应力进行了模拟计算。结果表明同体积下的非圆形磁性颗粒磁流变脂的剪切应力比圆形磁性颗粒磁流变脂大,且随接触边长的减少剪切应力亦减少,但都比圆形磁性颗粒磁流变脂的剪切应力大。即使零场条件下,非圆形磁性颗粒磁流变脂的剪切应力比圆形磁性颗粒磁流变脂大,说明球形磁流变液不是最佳选择。所以,非圆形磁性颗粒的磁流变脂机理研究对高性能磁流变液制备及其应用具有极其重要的指导意义。
Magnetorheologic grease is another magnetorheologic intelligent material with great development after magnetorheologic liquid and elastomer.This paper,constructed the shear stress model of non-magnetic particle.This model simulated the relation between shearing yield stress and magnetic density when radius and side length are equal,and when the volume is the same,and simulated the shearing stress under zero field.The result indicates that when the volume is the same the shear stress of non-round magnetorheologic grease of magnetic particle is bigger round one,and shear stress decreases with contacting border length,however,it is always bigger than round magnetic particle.Even though under zero field,the shear stress of non-round magnetorheologic grease of magnetic particle is bigger round one,which demonstrates that round magnetorheologic liquid is not the best choice.Thus,the mechanism investigation on magnetorheologic grease of non-round magnetic particle is significant for the manufacturing and application of high performance magnetorheologic liquid.
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