Influence of Pressure Load on Dynamic Characteristics of Granular Lubrication Interface
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摘要: 本文利用离散单元法建立了颗粒流润滑的数值分析模型，研究了压力载荷对颗粒流润滑的宏观流动、配位数和力链演变以及接触承载等动力学特性的影响规律。研究结果表明，颗粒润滑介质的平均速度沿间隙y向自下而上逐渐减小，而颗粒润滑介质的波动速度沿间隙y向的变化趋势则与此相反；颗粒介质间的微观接触结构和动力学特性具有瞬态性和易变性，且颗粒介质间的接触紧密程度和接触强度会随着压力载荷P的增大而变强；颗粒润滑系统的承载能力与系统内部的力链变化息息相关，且颗粒润滑系统的承载能力随着压力载荷P的增大而变强。Abstract: A numerical analytical model of the granular lubrication interface was established with the discrete element method (DEM). With the DEM, the dynamic characteristics of granular macro-flow, coordination number and force chain evolution as well as the bearing capacity of the pressure load were studied. The study results show that the average velocity of the granular lubrication interface decreases with the increasing height of the gap y, while its fluctuation velocity of is opposite to the average velocity. The microscopic contact structures and dynamic properties of the granular lubrication interface are transient and changeable, and its contact intensity and contact strength increase with the increasing pressure load P. The bearing capacity of the granular lubrication interface is closely related to the variation of force chain evolution and increases with the increasing pressure load P.
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Key words:
- granular lubrication interface /
- pressure load /
- velocity /
- bearing capacity /
- force chain evolution
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