Hydrodynamic lubrication under severe conditions

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5757769

Huang, Xiubao

Three different rheological models for viscoplastic lubricants were compared and Reynolds equations developed. The Reynolds equations were applied to analyze the wide slider bearing, the short slider bearing, and the metal forming inlet zone. The element analysis method, which reveals the local effect of asperities, was developed and applied to generate an average flow model for rough surface lubrication with isoviscous lubricants. Simple analytical expressions for flow factors and shear stress factors were derived, and were applied in the analyses of a wide slider bearing and a metal forming inlet zone. The method was also used to calculate the pressure distribution and load capacity for these cases when the number of asperities are finite. The Reynolds equation and a semiempirical plasticity equation were coupled to solve for the film shape and pressure profile for different loading conditions in a metal forming work zone with rough tooling. The combined effect of roughness and temperature difference between two surfaces were studied. The modified element analysis method was used to derive a modified average Reynolds equation, modified flow factors, and shear stress factors for thermoviscous lubricants.

• Research Organization: Northwestern Univ., Evanston, IL (USA)
• OSTI ID: 5757769
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BEARINGS
FLUID MECHANICS
HYDRODYNAMICS
LUBRICATION
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
PLASTICITY
PRESSURE GRADIENTS
REYNOLDS NUMBER
RHEOLOGY
ROUGHNESS
SHEAR
SURFACE PROPERTIES
TEMPERATURE EFFECTS
TEMPERATURE GRADIENTS