Experimental investigation of surface initiated rolling contact fatigue using dented surfaces

Autor: G. Dudragne, Fabrice Ville, R. Guers, Daniel Girodin
Přispěvatelé: Colin, Anne-Marie, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2001
Předmět:
Zdroj: Proceedings du 28th Leeds-Lyon Symposium on Tribology
28th Symposium Leeds-Lyon : Tribology Research: From model experiment to industrial problem: A century of efforts in mechanics, materials science and physico-chemistry
28th Symposium Leeds-Lyon : Tribology Research: From model experiment to industrial problem: A century of efforts in mechanics, materials science and physico-chemistry, Sep 2001, Vienne, Austria. pp.449-458
HAL
DOI: 10.1016/s0167-8922(01)80129-2
Popis: Generally, rolling bearing fatigue is divided into subsurface and surface initiated types. Subsurface fatigue has long been considered as the major damaging mechanism in lubricated contact submitted to cyclic loading. The improvement in steel processing during the last 20 years resulted in high steel cleanliness and as a consequence in a large reduction of subsurface inclusion initiated damage. Nowadays one of the main causes of damage (the other one corresponding to starvation) is surface initiated failure due to lubricant contamination. In fact, hard particles present in lubricants with various origins (coming from either external or internal sources) can not be completely eliminated in most commercial applications. Passing through the contact, they produce dents on the raceways, which generate stress concentrations, leading to fatigue life reduction. This paper describes the experimental procedures developed at SNR Roulements to investigate the impact of dents on bearing performance and to study the damage mechanisms. The evaluation was conducted using 2 types of pre-damaging processes to simulate contaminant defects prior to fatigue test under clean lubrication: u - dent printing on the raceway of flat washers using a Rockwell hardness indenter, - performing well-controlled and repeatable level of natural dents on the raceways of bearings using a specific equipment to damage bearing surface. Three-dimensional surface topography was used to characterise dent morphology and to compare the influence of materials and heat treatments. The results show that the pre-denting method on roller bearings is efficient to reproduce surface morphology and damage encountered on the components of equipment under practical operating conditions but in a shorter time interval. They also reveal significant differences in the performance of various bearing products and materials. It demonstrates the ability of this process to quantify the damaging effect of contaminants on bearing life.
Databáze: OpenAIRE
Externí odkaz: