Effects of Surface Micro-Geometry on the Pressures and Internal Stresses of Pure Rolling EHL Contacts

Abstract

A fast approach for the calculation of 3-D pressures and subsurface stresses in pure rolling EHL contacts with real (measured) roughness is presented. For the calculation of pressures the model uses the analytical work of Greenwood and Morales-Espejel for transverse (to the rolling direction) moving sinusoidal waviness. The model is extended to handle longitudinal waviness as well. By using these two basic components the pressure distribution for real rough surfaces can now be calculated form the 3-D roughness map. From the surface pressures, the sub-surface stress field can then be calculated with a similar technique. The result is the total Stress State in a rolling rough EHL contact. In this paper the method for calculating the pressures and stress fields is first described. It is then applied to several types of surface finish.

Presented as a Society of Tribologists and Lubrication Engineers Paper at the ASME/STLE Tribology Conference in Cancun, Mexico October 27–30, 2002

KEY WORDS:

• Elasto-Hydrodynamic Lubrication
• Surface Roughness Effects

Notes

Presented as a Society of Tribologists and Lubrication Engineers Paper at the ASME/STLE Tribology Conference in Cancun, Mexico October 27–30, 2002