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Thermomechanical fatigue of stainless steels for automotive exhaust systems

Published online by Cambridge University Press:  22 February 2006

P. -O. Santacreu ,
L. Bucher ,
A. Koster  and
L. Remy
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Abstract

Exhaust systems are submitted to ever more severe service conditions, high temperature thermomechanical fatigue in particular. A numerical method is proposed for the design and the lifetime prediction of stainless steel exhaust manifolds submitted to a thermal fatigue load that is deducted from motor bench tests. The method relies on behaviour and damage models and on finite element analysis design of stainless steel exhaust manifolds. A dedicated damage criterion is proposed on the basis of the peak temperature and plastic strain amplitude reached during a thermal cycle. A more general thermomechanical fatigue damage model is also discussed.

Type
Research Article
Information
Metallurgical Research & Technology , Volume 103 , Issue 1: Compte rendu des Journées Sidérurgiques Internationales 2005 de l'ATSCoulée continueAciers inoxydables , January 2006 , pp. 37 - 42
Copyright
© La Revue de Métallurgie, 2006

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