| Autor: |
R Fougeres, P Lamagnère, A Vincent, Daniel Girodin, L Gosset, G. Dudragne, G Lormand |
| Rok vydání: |
2009 |
| Předmět: |
|
| DOI: |
10.1520/stp12123s |
| Popis: |
A method of calculating fatigue life of bearing steels, which accounts for the material fatigue process in relation with its microstructure, is required for optimizing these materials. Such a new approach is presented for bearing steels submitted to rolling contact fatigue, for which inclusions are well known to play a fundamental role on steel fatigue strength. A characterization of the steel is carried out by means of nano-indentation tests for determining the elastoplastic properties of the inclusions, and compression tests for determining the microyield stress and cyclic plasticity behavior of the steel matrix. Furthermore the number of cycles to crack nucleation is determined by high frequency ultrasonic echography. A model is developed to estimate movement and accumulation of dislocations around high modulus inclusions. This model enables one to calculate shape and size of white etching areas formed around inclusions as well as the number of cycles to crack nucleation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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