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  • MECHANICAL ENGINEERING  (3)
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  • 1
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    Elastohydrodynamic lubrication calculations used as a tool to study scuffing (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new Reynolds equation was developed that takes into account the nonlinear viscous behavior of the fluid. The new Reynolds equation considers the nonlinear viscous fluid model of Eyring, the equilibrium equation, the constant mass flow, and the kinematic boundary condition. The new Reynolds equation and the elasticity equation are solved simultaneously by using a system approach and a Newton-Raphson technique. Comparisons are made with results obtained from the classical Reynolds equation. The effects of sliding speed and introducing a bump or a groove within the conjunction are studied. Results are shown for both moderate and heavy loads.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-87097 , E-2658 , NAS 1.15:87097
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Fast numerical calculations of EHD sliding traction forces Application to rolling bearings (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Based on analytical calculations assuming isothermal elastohydrodynamic (EHD) lubrication conditions, and on curve-fitting of a thermal correction factor, a new formula is proposed to calculate the sliding traction force developed in a concentrated contact, assuming a nonlinear, viscoelastic lubricant and undirectional sliding. When sliding occurs in the rolling and transverse directions (bidimensional sliding), a simplified numerical method is outlined by which the components of the local shear stress are quickly calculated. The latter method is applied to the calculation of the shear stress and temperature distribution in the ball-raceway contacts of an angular-contact ball bearing. Because of the viscoelastic behavior of the lubricant, a nonzero lateral traction force is obtained.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 84-TRIB-26
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fast approach for calculating film thicknesses and pressures in elastohydrodynamically lubricated contacts at high loads (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The film thicknesses and pressures in elastohydrodynamically lubricated contacts have been calculated for a line contact by using an improved version of Okamura's approach. The new approach allows for lubricant compressibility, the use of Roelands' viscosity, a general mesh (nonconstant step), and accurate calculations of the elastic deformation. The new approach is described, and the effects on film thickness, pressure, and pressure spike of each of the improvements are discussed. Successful runs have been obtained at high pressure (to 4.8 GPa) with low CPU times.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 85-TRIB-42 , ASME, Transactions, Journal of Tribology (ISSN 0742-4787); 108; 411-419;
    Format: text
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    NASA TECHNICAL REPORTS
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