Objetivo The analytical models which describe the contacts, the stress field, the initiation of crack and the conditions to reach the surface spalling have led to establish four typical criteria regarding the endurance limit (H1, H2, H3 and H4). The fatigue tests conducted either on simulated contacts or on full bearings have been evaluated from damage point of view. The endurance limit of several materials has been obtained through the residual stress analysis of a wide range of samples. In order to predict the endurance limit in relation with the residual stress versus depth, a representative parameter has been created: the characteristic deformation number. The effect of temperature has been also determined on these steels : * 100Cr6, M50-NIL and CRONIDUR 30 The values found on M50 correlated the H1 limit obtained from the analysis. A part of the tests was devoted to contacts in gears. The Barkhausen noise technic was used. A good correlation was observed with residual stress on 100Cr6 steel.Deviation between calculated lives and services lives is due to a combination of material improvements,inadequate representation of the stress mechanism that cause failures and general oversimplification embodied in the general power law assumption.This project proposes:1. To support a significant progress in the development of a new fatigue model based on a physical/metallurgical microscopic approach with a macroscopic approach of the stress tensor (continuum mechanics).2. To conduct monitored test in order to evaluate the real endurance limit of actual bearing steels and to identify the weight of influencing parameters:- temperature- hertzian stress- hoop stress- residual stress.3. To achieve similar test in industrial situations,particularly in high speed conditions representing turbines engines applications.4. To investigate damage effect on after service bearings and to correlate above analysis.5. To investigate influence of similar parameters on the rolling/sliding contact subjected to similar fatigue phenomenon in gear applications. Ámbito científico social scienceslaw Programa(s) FP3-BRITE/EURAM 2 - Specific programme (EEC) of research and technological development in the field of industrial and materials technologies, 1990-1994 Tema(s) 2.1.3 - Maintainability and reliability Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador TURBOMECA Aportación de la UE Sin datos Dirección 64511 BORDES Francia Ver en el mapa Coste total Sin datos Participantes (9) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo BMW ROLLS-ROYCE GMBH Alemania Aportación de la UE Sin datos Dirección HOHEMARKSTRAßE 60-70 61440 OBERURSEL Ver en el mapa Coste total Sin datos FAG KUGELFISCHER GEORG SCHAFER KGAA Alemania Aportación de la UE Sin datos Dirección GEORG-SCH FER STRAßE 30 97421 SCHWEINFURT Ver en el mapa Coste total Sin datos Hispano-Suiza SA Francia Aportación de la UE Sin datos Dirección Rue du Capitaine Guynemer 92270 Bois-Colombes Ver en el mapa Coste total Sin datos Institut National des Sciences Appliquées (INSA) Francia Aportación de la UE Sin datos Dirección 20 avenue Albert Einstein 69621 Villeurbanne Ver en el mapa Coste total Sin datos Motoren- und Turbinen-Union München GmbH (MTU) Alemania Aportación de la UE Sin datos Dirección Dachauer Straße 665 80995 München Ver en el mapa Coste total Sin datos RENAULT Francia Aportación de la UE Sin datos Dirección 8-10 AVENUE EMILE ZOLA 92109 BOULOGNE BILLANCOURT Ver en el mapa Coste total Sin datos Rolls Royce plc Reino Unido Aportación de la UE Sin datos Dirección BS12 7QE Filton Ver en el mapa Coste total Sin datos SNR ROULEMENTS Francia Aportación de la UE Sin datos Dirección 1 RUE DES USINES 74010 ANNECY Ver en el mapa Coste total Sin datos Société Nationale d'Études et de Construction de Moteurs d'Aviation (SNECMA) Francia Aportación de la UE Sin datos Dirección 2 boulevard du Général Martial Valin 75724 Paris Ver en el mapa Coste total Sin datos
