Thermomechanical fatigue of stainless steels for automotive exhaust systems
| Autor: | Pierre-Olivier Santacreu, Alain Köster, Luc Rémy, Laurent Bucher |
|---|---|
| Přispěvatelé: | Ugine, Arcelor, Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2006 |
| Předmět: |
010302 applied physics
Engineering Exhaust manifold business.industry Constitutive equation Metals and Alloys Automotive industry Mechanical engineering 02 engineering and technology Structural engineering Converters 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Durability Finite element method 13. Climate action Range (aeronautics) 0103 physical sciences [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Materials Chemistry Physical and Theoretical Chemistry 0210 nano-technology business Automotive exhaust |
| Zdroj: | Revue de Métallurgie Revue de Métallurgie, 2006, pp.37-42 |
| ISSN: | 1156-3141 0035-1563 |
| DOI: | 10.1051/metal:2006102 |
| Popis: | National audience; Stainless steel grades are now widely used for automotive exhaust systems, in order to increase their durability. Indeed, the exhaust systems are subjected to ever more severe conditions and they include high technology components such as manifolds, catalytic converters and particle filters. This evolution is a direct consequence of the worldwide effort to decrease automotive pollutant emissions in accordance with the new environmental regulations. This paper deals with the thermomechanical fatigue (TMF) of stainless steels at high temperature, specially behaviour and damage models, and with the recent progress in the development TMF fatigue design tools using FEA related to the design of stainless steel exhaust manifolds. A numerical method is proposed for the design and the lifetime prediction of stainless steel exhaust manifold under a thermal fatigue load. It includes the modeling of manifolds submitted to the thermal cycle reproduced from motor bench tests. The identification of the constitutive law, in particular the elasto-viscoplastic model, for a wide range of temperatures, provides the most realistic stress-strain response of the structure. Finally, a dedicated damage criterion is proposed on the basis of the maximal temperature and plastic strain amplitude reached during a thermal cycle (modified-Taira model). Identification of a more general damage model on the basis of TMF tests is also discussed. |
| Databáze: | OpenAIRE |
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