表面粗糙纹理对非牛顿热弹流润滑性能的影响  

Influence of Surface Roughness on the Lubricating Behavior of Elliptic EHL Contacts under Thermal Non-Newtonian Conditions

作　　者：杨志强[1] 崔金磊[1] 杨沛然[1] 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033

出　　处：《润滑与密封》2008年第4期8-11,23,共5页Lubrication Engineering

基　　金：国家自然科学基金资助项目(50575108);青岛市科技发展基金资助项目(05-1-JC-94).

摘　　要：建立了考虑表面粗糙度的点接触热弹流润滑模型,假设滚滑工况下慢速运动的固体表面是粗糙的,而快速运动的固体表面绝对光滑。卷吸速度沿接触区短半轴方向,表面粗糙纹理以正弦函数来表征,润滑剂符合Ree-Eyring非牛顿流体粘性定律。通过完全数值求解,讨论了3种不同构成的粗糙纹理对弹流润滑性能的影响。其中2种是周期性时变问题,求解是从一个准稳态解开始逐个瞬时迭代来实现的。结果表明,粗糙纹理会使得接触区里对应处产生明显的局部高压,局部温升,油膜厚度也相应减小。而纵向粗糙度时润滑效果最差,因为具有更危险的最小膜厚值。The thermal EHL model of roughness surface for elliptic contact composed of two steel bodies was established.It was assumed that the slower surface was rough while the faster surface was smooth in a rolling-sliding condition.The entrainment velocity was assumed to be along the minor axis of the Hertzian contact ellipse.The waviness were given by sinusoidal functions,and the non-Newtonian flow of the lubricant was described by the Ree-Eyring model.The influence of three kinds of different surface waviness on...

关 键 词：粗糙纹理 非牛顿 热弹流 周期性时变问题 

分 类 号：TH117[机械工程—机械设计及理论]