表面微凸体形态对三体摩擦界面间隙的影响

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The 2-D granular matter parallel shearing cell models with different shape of micro-asperity surfaces were established by the explicit finite element method（FEM） to study the gap of the three- body friction interface. These models were applied to analyzing the influence of normal load and coefficient of friction of contact pairs on the gap. The simulation results indicate that the gap decreases with the increasing load in the pointed micro-asperity model, but the value almost remains stable in the blunt micro-asperity model. The gap increases with the coefficient of friction getting larger in the both models, while the variation amplitude is different. The results also show that the stability of granule System closely relates to granule distribution structure and friction force among particles.为了研究颗粒介质三体摩擦界面间隙变化规律，文章利用显式有限单元法建立了具有不同微凸体形态表面的二维平行板剪切模型，利用该模型分析了法向载荷、接触摩擦因数对三体摩擦界面间隙的影响。分析结果表明：随载荷增加，尖锐微凸体模型中界面间隙呈减小趋势，圆滑微凸体模型中界面间隙保持不变；2个模型中界面间隙均随接触摩擦因数增加而变大，但变化幅度并不一致，剪切过程中颗粒体系的稳定性与其分布形态结构和颗粒间摩擦力密切相关。