Elastoplastohydrodynamic Lubrication with Dent Effects

A line contact elastoplastohydrodynamic lubrication (EPHL) model has been developed to investigate the effect of a dent on heavily loaded rolling/sliding contacts. The Jinite element analysis (FEA) was used to obtain the plastic deformation of the surfaces caused by the high-pressure spikes that occur in the contact due to the presence of a dent. The effects of various dent sizes on the pressure and film thickness were studied. The results indicate that by including the plastic deformation of the surfaces in the analysis, the pressure spikes that occur due to a dent in the contact are smaller than those of the purely elastic case, and local material yielding occurs, resulting in bumps at the edges of the dent. Effects of diflerent bump shapes at the dent edges were then studied in elastohydrodynamic lubrication (EHL) contacts and the results indicated that these bumps can reduce the magnitude of pressure spikes.

[1]  M. W. Brown,et al.  Shear mode crack growth and rolling contact fatigue , 1991 .

[2]  F. Sadeghi,et al.  Effects of a single bump or dent in time dependent thermal line EHD lubrication , 1994 .

[3]  A. Jackson,et al.  A Line-Contact Micro-EHL Model With Three-Dimensional Surface Topography , 1994 .

[4]  Xiaolan Ai,et al.  The influence of moving dent on point EHL contacts , 1994 .

[5]  J. C. Hamer,et al.  Particle Deformation and Counterface Damage When Relatively Soft Particles are Squashed Between Hard Anvils , 1989 .

[6]  C. Venner.  Multilevel solution of the EHL line and point contact problems , 1991 .

[7]  Huseyin Sehitoglu,et al.  An Analytical Approach to Elastic-Plastic Stress Analysis of Rolling Contact , 1994 .

[8]  G. T. Hahn,et al.  Analysis of rolling contact spall life in 440C bearing steel , 1994 .

[9]  Farshid Sadeghi.  A Comparison of the Fluid Models Effect on the Internal Stresses of Rough Surfaces , 1991 .

[10]  J. C. Hamer,et al.  The Effects of Particulate Contamination in Rolling Bearings—a State of the Art Review , 1990 .

[11]  A. A. Lubrecht,et al.  The numerical solution of the elastohydrodynamically lubricated line- and point contact problem, using multigrid techniques , 1987 .

[12]  Leon M Keer,et al.  Surface Crack Initiation Under Contact Fatigue: Experimental Observation and Contact Analysis , 1993 .

[13]  W. Holzhauer.  Surface Changes Around Large Raceway Indentations During Run-in of Tapered Roller Bearings , 1991 .

[14]  Henry Peredur Evans,et al.  Simulation of Elastohydrodynamic Contacts Between Rough Surfaces , 1992 .

[15]  Charles A. Moyer.  The Influence of Debris on Bearing Performance: Chapter II , 1989 .

[16]  J. M. de Mul,et al.  The influence of certain raceway dent geometries (3-D) on contact stresses and rating fatigue life of rolling bearings , 1987 .

[17]  R. S. Sayles,et al.  Debris Damage in Rolling Bearings and Its Effects on Fatigue Life , 1988 .

[18]  R. Bosma,et al.  The Influence of Longitudinal and Transverse Roughness on the Elastohydrodynamic Lubrication of Circular Contacts , 1988 .