The paper deals with the thermal mechanical fatigue (TMF) of stainless steels used for exhaust manifolds. A thermal fatigue test on V-shape specimen was early developed at Ugine & Alz to simulate such thermal and mechanical conditions. The examination of failed specimens indicates that cracks could be generally attributed to out-of-phase TMF. However, in specific cases, in-phase TMF may be dominant. For instance, manifolds made of austenitic stainless steel grades usually fail by in-phase TMF. Based on finite element calculation of the V-shape test, a damage criterion is proposed for out-of-phase TMF, which correlates the amplitude of the viscoplastic strain, the maximal temperature, the dwell time during the thermal cycle and the number of cycles to failure.
Thermal Fatigue Design of Stainless Steel Exhaust Manifolds
Sae Technical Papers
SAE World Congress & Exhibition ; 2007
2007-04-16
Aufsatz (Konferenz)
Englisch
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