NDLI: Non-steady state non-conformal contacts: friction and film thickness studies

Content Provider	Springer Nature Link
Author	Ciulli, E.
Copyright Year	2008
Abstract	Many machine elements work under non-steady state conditions. Velocity, load and geometry can be time-dependent, and this can influence in a significant way two important quantities of a lubricated contact: friction and film thickness.This work is devoted to non-conformal lubricated contacts under transient conditions and consists of two parts.In the first part a review is made of studies on transient conditions related to the systems themselves (as occurs in gears, valve train, piston assembly and rolling bearings), to particular operating conditions (as starting and stopping of the motion) and to variations localized in the contact (as the ones related to surface defects and roughness).The second part is specifically addressed to investigations on friction and film thickness under conditions of periodically variable velocity. Loops of film thickness and friction coefficient appear when these quantities are plotted as a function of the velocity, mainly due to squeeze effects. The friction is higher and the film thickness smaller for increasing speed than for decreasing speed. A time shift between the film thickness and the speed variations occurs. The loops amplitude increases by increasing the frequency of the speed variation.
Starting Page	409
Ending Page	425
Page Count	17
File Format	PDF
ISSN	00256455
Journal	Meccanica
Volume Number	44
Issue Number	4
e-ISSN	15729648
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-10-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	EHL Transient conditions Friction coefficient Film thickness Periodically variable velocity Mechanical Engineering Automotive Engineering Civil Engineering Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Mechanical Engineering

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