摘要
在ZrO2-Steel接触副两表面上分别设计方向与卷吸速度垂直的横向纹理,使用点接触瞬态非牛顿热弹流模型进行微弹流问题的数值分析,分析高速滑滚工况下的热黏度楔效应及微弹流现象,并与理想光滑表面结果进行比较。结果表明:快速运动表面采用导热系数低的氧化锆陶瓷材料会得到更厚的膜厚;两固体表面的横向凹槽及凸峰会引起油膜和压力的局部增大或减小,且氧化锆为慢速运动表面时粗糙度引起压力的局部变化更为剧烈;微观形貌会影响摩擦因数,滚滑工况下随两固体表面的运动,摩擦因数值会围绕光滑表面的摩擦因数值上下波动,且两表面的峰谷足够靠近相互作用时摩擦因数值显著降低。因此,工程设计中尽量使用导热率小的材料作为接触副的快速表面,且选择合适的微观形貌来提高润滑性能。
A transverse ridge or groove perpendicular to the entrainment velocity was set on each surface of ZrO2-Steel contact pair,respectively,and the transient non-Newtonian thermal elastohydrodynamic lubrication(EHL)model was established to analyze the micro-EHL problems numerically.The thermal viscosity wedge effect and micro-EHL phenomenon under high-speed rolling-sliding conditions were analyzed,and were compared with the ideal smooth surface results.The results show that a thicker film thickness can be obtained by using zirconia ceramic material with low thermal conductivity as a fast moving surface.The groove or ridge on two solid surface causes a local increase or decrease of the oil film and pressure,while the local variation in the pressure is more serious when using the zirconia as a slow moving surface.The transverse textures will influence the friction coefficient undoubtedly,the values of friction coefficient fluctuates up and down around the value of smooth surface friction coefficient with the motion of solid surfaces.Especially,the values of friction coefficient are decreased significantly when the ridge and groove of the two surfaces are close enough to interact.Therefore,it is suggested to use the materials with low thermal conductivity as the fast moving surface in the engineering design,and select appropriate micro-topography to improve the lubrication performance.
作者
赵金玲
崔金磊
王静
ZHAO Jinling;CUI Jinlei;WANG Jing(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao Shandong 266520,China;School of Mechanical Engineering,Donghua University,Shanghai 201620,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2020年第10期59-66,共8页
Lubrication Engineering
基金
国家自然科学基金项目(51875298)
山东省自然科学基金项目(ZR2019MEE040).
关键词
氧化锆
横向纹理
微弹流
热黏度楔效应
zirconia
transverse texture
micro-EHL
thermal viscosity wedge
