boundary lubrication


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boundary lubrication

[′bau̇n·drē ‚lü·brə′kā·shən]
(engineering)
A lubricating condition that is a combination of solid-to-solid surface contact and liquid-film shear.

boundary lubrication

A phase in lubrication in which a thin film of oil only a few molecules thick separates two rubbing surfaces. It can occur because of a high bearing load, inadequate viscosity, oil starvation, or loss of oil pressure. Boundary lubrication is not a desirable phase of lubrication as a rupture of the thin film means wear and even seizure.
References in periodicals archive ?
Consequently, friction at this location may be in the boundary lubrication regime.
This is because the viscous shear torque increases at squeezing stage and boundary lubrication stage due to the increase of lubricant viscosity and thus the corresponding viscous shear heat flux density increases.
All experiments related to the adhesion component were performed under boundary lubrication at a sliding velocity of 3.
Epoxidized vegetable oil is of higher viscosity, resistant to oxidation and less inclined to form sediments, lacquers and burnings; nevertheless, it retains similar boundary lubrication properties as appropriate fresh vegetable oil.
Thermal distortion) and will operate in the boundary lubrication regime.
It means that boundary lubrication plays an important role in the friction of synovial joints.
These industrial grade fluids protect metal parts from corrosion and rust, and provide boundary lubrication to the bearing and vanes.
Contributed paper gives experimental apptroach to defining the boundary lubrication frictional coefficient, ie.
Although the effect of galling sensitivity factors (such as roughness, boundary lubrication and temperature) upon skidmarking are not well documented, they are likely.
Malshe, CTO and founder of NanoMech, added, "we have conclusively proved we can dramatically enhance performance and life of all machines by reducing the coefficient of friction to near-zero including the ability to withstand extreme pressure (EP) under severe boundary lubrication with our new nGlide[R] grease innovation, and look forward to extending this scientific advancement now to motor oil which could ultimately decrease global fuel consumption and save U.
At top dead center (TDC) and bottom dead center (BDC) where the sliding velocity is extremely low and the load is high, the piston rings work under boundary lubrication.
They cover near-field spectroscopic delineation of interphase boundaries for chemical mapping at the sub-micron resolution, indentation size effect and the Hall-Petch "law," boundary lubrication and adhesion of rubber from wipers to the JKR equation, the effect of surface roughness on the adhesion of elastomers to hard surfaces, contact problems at the nanometer and micrometer scales and depth sensing indentation techniques, indentation in ceramics, the effect of solid solution impurities on dislocation nucleation in a (001) molybdenum-1.