复合材料密封环微观摩擦状态模拟与摩擦性能对比分析  

Numerical Simulation and Comparative Analysis of Microscopic Frictional Behavior of Composite Sealing Ring

作　　者：宫燃[1] 张鹤[2] 车华军[1] 徐宜[2] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]中国北方车辆研究所,北京100072

出　　处：《兵工学报》2015年第3期421-426,共6页Acta Armamentarii

基　　金：国家自然科学基金项目(51005104);江苏省自然科学基金项目(BK2011477);江苏省六大人才高峰项目(2014-JXQC-005);江苏大学青年骨干教师培养工程项目(2012年)

摘　　要：根据复合材料密封环材料非均匀性的特点,构建密封环微观摩擦接触的移动元胞自动机计算模型。按照实际工况条件施加负荷,可视化的模拟结果可以直观地表达出密封摩擦副微观表层结构的动态演化过程。对聚酰亚胺(PI)和聚四氟乙烯(PTFE)两种复合材料密封环进行对比分析,获得在模拟时间内摩擦系数变化过程。分析结果表明:在相同负荷下,两种材料的机械混合层的形成过程基本一致,PI密封环的摩擦系数大于PTFE密封环的摩擦系数,填充材料的性质和形态决定微观尺度的摩擦特征。开展两种材料的密封环摩擦试验,对宏观和微观的摩擦系数进行对比分析,证明移动元胞自动机模拟微观尺度摩擦状态的有效性,为密封材料选型提供一个合理的数值实验方法。According to the characteristics of the material heterogeneity of the composite sealing ring, the microscopic sliding contact is investigated based on the movable cellular automata. The microscopic dy- namic responses of sealing surfaces are visualized when loads are applied according to the actual working conditions. The frictional behaviors of the polyimide （PI） and the polytetrafluoroethylene （PTFE） com- posite sealing rings are analyzed, and the changing processes of friction coefficients are obtained within the simulation time. The results show that the formation and evolution processes of the mechanically mixed layers of PI and PTFE sealing rings are basically the same. The friction coefficient of PI sealing ring is greater than that of PTFE one. The properties and morphology of filler materials determine the mi- croscopic friction behaviors. The friction test is conducted for PI and PTFE sealing rings. The coefficients of friction in the simulations and tests are calculated and compared. The results indicate the effectiveness of microscopic frictional simulations in the mixed lubrication based on the movable cellular automata.

关 键 词：工程通用技术 密封环 微观尺度 复合材料 摩擦性能 移动元胞自动机 

分 类 号：TH117[机械工程—机械设计及理论]