摘要:

AbstractThe effect of a solid wall on Poiseuille flow of ultra thin film has been simulated by molecular dynamics for a simple Lennard‐Jones fluid. Results showed that the velocity profile and flow are consistent with the prediction of the Stokes equations when the film thickness is considerably greater than the molecular ‘diameter’; that Poiseuille or hydrodynamic flow will be blocked by the solid walls, and the effective viscosity will increase as the film thickness corresponds more closely to only a few molecular diameters; and that when the film thickness is reduced to just the molecular diameter, the fluid molecules between the walls will be solidified or crystallised, and the Poiseuille flow will vanish. This may be one of the mechanisms of transition from hydrodynamic to boundary lubric

ISSN:1354-4063    

DOI:10.1002/tt.3020010402

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe tribological behaviour of different ceramics in contact with steel was studied for the case of oscillating sliding motion with a ball‐on‐disc apparatus. The influence of several test condition parameters was investigated by a systematic variation of the stroke, frequency, and normal load at room temperature in laboratory air at different levels of relative humidity. Each of the four parameters was varied in three stages. While the coefficient of friction was only mildly influenced by the operational variables, the coefficient of wear showed great variations and depended strongly on the humidity of the surrounding air. The effect of the operational variables and of the humidity on friction and wear varied for the different materials under investigat

ISSN:1354-4063    

DOI:10.1002/tt.3020010403

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA model, consisting of the stochastic formulae which describe the relationship between the friction coefficient and the parameters known to be significant in dry friction, is proposed for dry sliding friction between two randomly rough surfaces. The model considers the frictional phenomena which dominate in energy dissipation and which may occur simultaneously between contacting elements. The kind of interaction in a given spot of asperity contact depends on the local energy flux density. The effect of several parameters on the friction coefficient, the real area of contact, and the number of contact spots can be calculated with the FRI‐SIM program. A comparison of the simulation and experimental data shows a convergence of result

ISSN:1354-4063    

DOI:10.1002/tt.3020010404

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1354-4063    

DOI:10.1002/tt.3020010405

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1354-4063    

DOI:10.1002/tt.3020010406

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1354-4063    

DOI:10.1002/tt.3020010407

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1354-4063    

DOI:10.1002/tt.3020010408

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1354-4063    

DOI:10.1002/tt.3020010409

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1354-4063    

DOI:10.1002/tt.3020010401

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY