The Effect of Surface Irregularities on The Elastohydrodynamic Lubrication of Sliding Line Contacts
Goglia, Peter Ross
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https://hdl.handle.net/2142/70112
Description
Title
The Effect of Surface Irregularities on The Elastohydrodynamic Lubrication of Sliding Line Contacts
Author(s)
Goglia, Peter Ross
Issue Date
1982
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Abstract
A method for studying the effects of surface irregularities on the elastohydrodynamic (EHD) lubrication of sliding line contacts is presented. A series of case studies illustrates the effect of furrow, asperity, and wavy surface irregularities on the pressure distribution, film thickness, and subsurface octahedral shear stresses in such contacts. The method is based on the solution of the combined Reynolds and elastic surface displacement integro-differential equation in finite difference form by the Newton-Raphson technique for systems of nonlinear equations. The results of the case studies show that the presence of surface irregularities has a significant effect on the fluid film pressure distribution, film thickness, and state of stress in the solid surface. The practical significance of the analytical results is the implied accelerated fatigue and scuffing failure in machine elements under sliding line contact EHD lubrication conditions.
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