High Cycle Thermal Fatigue of two austenitic stainless steels - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Article Dans Une Revue International Journal of Fatigue Année : 2024

High Cycle Thermal Fatigue of two austenitic stainless steels

Résumé

Thermal fatigue is one of the main damage mechanisms that engineers must take into account in the design of current or future nuclear power plants. Fluctuations of temperature in the fluid is indeed inevitable, as a partial transfer of these fluctuations to the solid walls, and the resulting oscillations of thermal gradients must stay low enough to prevent the formation of typical crack networks. A chain of simulations, from thermohydraulics to thermo-mechanics of materials, is usually used to estimate the material loading that needs to be compared to material fatigue curves. There are not so many thermal fatigue experimental results in the literature that can serve to validate the last part of this chain of simulations, especially in the High Cycle Fatigue (HCF) regime. In this study, HCF thermal fatigue tests are performed under helium environment on two types of austenitic stainless steels, with an original apparatus in which cyclic thermal loading is imposed by a pulsed laser beam. Crack initiation and crack network developments are detected by an InfraRed (IR) camera that is also used with IR pyrometers to measure the thermal loading on the area impacted by the laser. The influence of temperature variation, pulse duration and a mean mechanical stress on crack initiation, crack propagation rate and crack network morphology is evaluated. Eventually, a numerical analysis of thermal fatigue tests, fed by proper experimental measurements on the crack initiation surface, allows deducing that the number of cycles to crack initiation is similar to the one obtained in more classical uniaxial isothermal fatigue results.
Fichier sous embargo
Fichier sous embargo
0 3 13
Année Mois Jours
Avant la publication
dimanche 1 septembre 2024
Fichier sous embargo
dimanche 1 septembre 2024
Connectez-vous pour demander l'accès au fichier

Dates et versions

cea-04491226 , version 1 (05-03-2024)

Identifiants

Citer

Ludovic Vincent, Elodie Rouesne. High Cycle Thermal Fatigue of two austenitic stainless steels. International Journal of Fatigue, 2024, 182, pp.108204. ⟨10.1016/j.ijfatigue.2024.108204⟩. ⟨cea-04491226⟩
18 Consultations
3 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More