检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:方燕飞 马丽然[2] FANG Yanfei;MA Liran(College of Mechanical Engineering and Automation,Huaqiao University,Fujian Xiamen 361021,China;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China)
机构地区:[1]华侨大学机电及自动化学院,福建厦门361021 [2]清华大学摩擦学国家重点实验室,北京100084
出 处:《摩擦学学报》2022年第6期1138-1147,共10页Tribology
基 金:国家自然科学基金(51922058);福建省自然科学基金(2021J05055);华侨大学高层次人才科研启动费项目(21BS101)经费资助。
摘 要:针对球-盘滑动试验,在磨合过程中获得超低摩擦的液体润滑状态,建立耦合流体润滑、粗糙接触力学、Archard磨损方程和相关物理参数(液体黏度、表面粗糙度和磨损系数)时变函数的混合模型,研究磨合过程中液体润滑的摩擦系数演化.通过数值模拟结果可知:在磨合过程中,润滑介质等效黏度增大,形成流体动压润滑薄膜,有效隔开粗糙表面;其次在磨合过程中,新生成的表面粗糙度降低,减少粗糙峰承载比,实现超低摩擦润滑状态;最后在适当的液体黏度和提高表界面效应减少边界摩擦系数,可进一步实现液体超低摩擦润滑状态.为磨合过程宏观液体润滑性能演化所建立的混合数值模型对提高液体润滑超低摩擦设计效率具有重要价值意义.Ultra-low friction operating state has attracted more and more attention from academia and industry.In the past thirty years,liquid lubrication system achieving ultra-low friction coefficient are fruitfully discovered on the balldisk sliding experiment during running-in.Among them,it can be found many researches of liquid lubrication with ultralow friction are carried out dependent on experiments.However,theoretical research of liquid lubrication with ultra-low friction is relatively backward,and quantitative of analysis are relatively a few.For this purpose,a hybrid model of the friction coefficient evolution was established during running-in coupling of fluid lubrication,asperity contact mechanics and Archard wear model.The time varying function of liquid viscosity,surface roughness and wear coefficient were also proposed in this model,which were a common“S”shape to describe those parameters change based on the state evolution.Subsequently,the hybrid model of liquid lubrication performance evolution during running-in was numerical programmed to simulate and analyze the influence mechanism of liquid lubricant’s viscosity and surface parameters on tribological performance.The surface profile,the film hydrodynamic pressure,contact pressure and friction coefficient can be predicted during running-in.Numerical results can be shown that:the worn surface profile changed sharply in the early period of running-in,while the contact surface became relatively flatted after running-in process.Based on the curve of asperity contact ration and film load ratio,the liquid lubrication gradually transformed from boundary/mixed lubrication to hydrodynamic film lubrication.At the same time,the friction coefficient evolved from large value to ultralow value.Under the liquid superlubricity state,the thickness of the liquid lubrication film was sufficient to completely separate the contact surface.The friction mainly came from the internal viscous shear of the lubricant.Further,the effect of lubricant viscosity and surface rough
关 键 词:液体润滑 磨合 流体动压效应 粗糙峰接触 超低摩擦 时变函数
分 类 号:TH117.1[机械工程—机械设计及理论]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.171