Effects of Texture Modification on Bearing RCF Life
Highly localized tribological contacts can modify the surface texture of rolling element bearing surfaces. The evolution of the surface texture generates modified subsurface stress fields within the contact and subsequently may alter the bearing rolling contact fatigue (RCF) life. In this present study, relationships between bearing surface topography and subsurface stress states are examined for their effects on bearing RCF life in the limiting case of boundary or dry contact. Results show that seemingly minor changes to surface topography may influence the stress distribution enough to affect RCF life under heavily loaded conditions.Copyright © 2009 by ASME
A study of concrete behavior over a large range of strain rates has been the focus of research conducted at the Joint Research Center-Ispra (JRC). The program was developed to produce new data concerning a few basic but debated subjects of industrial importance. In this paper, the influence of increasing aggregate size on the strain-rate tensile behavior of plain concrete is described. This study is a first step toward calibrating the constitutive law of concrete in the high-strain-rate field.