By M. Priest, P. Ehret, L. Flamand, G. Dalmaz, T.H.C. Childs, D. Dowson, Y. Berthier, C.M. Taylor, A A Lubrecht, J.M. Georges
The twenty fifth Leeds-Lyon Symposium on Tribology was once held on the Institut des Sciences Appliqu?es de Lyon, from 8-11th September, 1998. Its primary subject matter was once, ''Lubrication on the frontier: the position of the interface and floor layers within the skinny movie and boundary regime''. This subject was once selected since it represents an enormous evolution of the learn box. The Symposium opened with a keynote deal with entitled ''Role of surface-anchored polymer chains in polymer friction'' which defined the procedures occurring on the interface among ''solid'' and ''liquid''. The keynote deal with was once via invited lectures. to begin with, ''Fuel effective engine oils, additive interactions, boundary friction and wear'' provided the economic standpoint on lubricant formula and engine checking out and its evolution. the second one lecture was once entitled ''For institution of a brand new EHL theory'' and under pressure the necessity to expand the present EHL thought. starting in 1974, The Leeds-Lyon Symposia have now lined a variety of themes. the fundamental objective every year is to choose a subject matter of present curiosity to tribologists and to give a contribution to extra the development of data in chosen fields.
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Extra resources for Lubrication at the Frontier: The Role of the Interface and Surface Layers in the Thin Film and Boundary Regime,
Sample text
3 ,4,,I 300 E pri-MoDTP o I-c 0 11. BOUNDARY CONTACT- TRIBOCHEMICAL REACTOR o Q. Tribochemical reactions in the boundary contact take place under more severe conditions than those in the bulk oil. They generally occur under higher loads, speeds and stresses which produce higher reaction temperatures and pressures. The more severe conditions affect not only the rate of film formation but also the rate of film removal in a dynamic process which could be characterized by the general equation given in Figure 22.
As the sliding speed increases, a slight increase in film thickness occurs at the inlet region of the EHL conjunction and just before the exit constriction (Fig. 2A(c)); there are two shallow dimples in the contact area. Note that under steady state conditions, a very shallow dimple is produced in the whole area surrounded by the horseshoe shaped constriction in a slower speed region as compared with the speed region where the two dimples are formed. Such two dimples were not produced in a light load.
These additives, in combination with properly selected zinc dialkyldithiophosphates (ZnDTP), not only reduce friction but also provide good wear protection [11, 12, 13]. Issues of designing such oils and their performance characteristics were recently reviewed by Inoue [14]. One shortcoming of these MoDTC/ZnDTP containing oils is that their friction reducing capabilities are gradually depleted with mileage accumulation (Figure 8). 04; F ~" ~ " ~ ' 1000 2gO0 g~ ' 5W-20 5W-30 1 ii! 5W-20 5W-30 5W-20 5W-30 5W-20 Figure 7 Power loss estimates.