| Autor: |
Guangteng, G, Smeeth, M, Cann, P M, Spikes, H A |
| Zdroj: |
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology; March 1996, Vol. 210 Issue: 1 p1-15, 15p |
| Abstrakt: |
Experimental work using ultrathin film interferometry has shown that some polymer solutions in oil form much thicker films at slow speeds in rolling, concentrated contacts than predicted from elastohydrodynamic (EHD) theory. This behaviour can be interpreted as resulting from the polymers forming adsorbed, surface layers of enhanced concentration on the two solid surfaces. Such layers, which are typically 20 nm thick, would be significantly more viscous that the bulk solution and thus produce thicker EHD films. This concept has been supported by modelling the elastohydrodynamic point contact using control volume analysis with a layered surface viscosity. The film thickness behaviour predicted computationally using this technique is quite similar to that found experimentally using polymer solutions. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
