Vers une optimisation de la tenue à la fatigue de pièces forgées intégrant l’histoire mécanique des matériaux
DOI:
https://doi.org/10.13052/REMN.17.283-301Keywords:
multiaxial fatigue, high cycle fatigue, forging, anisotropy, residual stressesAbstract
Forging of metal components induces grain flow orientation, which gives rise to anisotropic mechanical properties. Our study deals with the definition and the use of this grain flow anisotropy into fatigue life calculation. We have focused on high cycle fatigue, and we deal with steels containing malleable inclusions above a critical size. A new multiaxial criterion has been developed on the basis of the Murakami equation. This criterion has been implemented in the finite element code Forge 3®. This computational tool uses a new variable to represent the grain flow orientation provided by forging simulation to account for subsequent fatigue anisotropic behaviour. Moreover, residual stresses resulting from forging are also taken into account to perform the fatigue calculation. Finally, a virtual simulation chain, including Forging and Fatigue calculation is carried out. The final goal is to improve fatigue properties by modifying forging conditions.
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