摘要
根据密封环的结构形式和服役特点,提出在微观尺度内密封环动态接触过程的离散建模方法。基于移动元胞自动机算法,结合复合材料密封环多种组成材料的特点,对密封摩擦副两粗糙表面局部接触区域进行离散建模。根据实际的工况条件加载相应载荷,通过可视化的模拟过程获得密封接触面微观动态响应,表达出磨损颗粒和润滑油组成的机械混合层的形成与演变过程,研究表明机械混合层对密封动态接触有显著影响,在混合摩擦过程中起到流体润滑和固体润滑的双重效果;同时定量模拟密封接触表面颗粒的旋转角和速度场,分析微观磨损颗粒运动规律;模拟计算获得瞬态摩擦因数曲线及其拟合曲线,通过与实测数据对比发现具有较高吻合度。表明微观动态接触离散模型在密封接触研究方面的适用性,是密封及其相关摩擦副微观接触状态分析的有效方法。
According to the characteristics of the structures and working conditions of sealing rings,a discrete modeling method is presented to investigate the sliding contact in the microscale.Based on the movable cellular automata and considering of the properties of several materials in the composite sealing ring,the discrete model is built in the local contact area of two rough sealing surfaces.The microscopic dynamic responses of sealing surfaces are visualized when loads are applied according to the actual working conditions.The formation and evolution of the mechanically mixed layer composed of loose worn particles and lubricating oil are properly investigated.The results show that the mechanically mixed layer has a significant influence on the sliding contact and this layer has the dual effect of liquid and solid lubrication during the mixed friction process.The automata rotation angles and automata velocities are calculated quantitatively and the dynamic behaviors of worn particles are analyzed.The local friction coefficients and its fitting curve are obtained,which agree well with the test data.The microscopic discrete model of sliding contact has the applicability in the field of sealing contact and provides a reliable approach to study contact states of sealing rings and other friction pairs in the microscale.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第9期77-83,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(51005104)
江苏省基础研究计划(自然科学基金)(BK2011477)
江苏大学青年骨干教师培养工程资助项目
关键词
密封环
动态接触
移动元胞自动机
微观尺度
sealing ring
sliding contact
movable cellular automata
microscale
作者简介
宫燃,男,1978年出生,博士,副教授.主要从事车辆摩擦、密封方面的研究.E-mail：gongran@ujs.edu.cn
