A flexible modelling framework leading to a pobabilistic multiaxial Kitagawa-Takahashi diagram : applied to cast Al-Si alloys

Viet-Duc Le (1, 2, 3) , Daniel Bellett (1) , Franck Morel (1) , Nicolas Saintier (2) , Thierry Palin-Luc (2) , Etienne Pessard (1) , Pierre Osmond (3)

1 LAMPA - PMD - Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité
2 I2M - Institut de Mécanique et d'Ingénierie de Bordeaux
3 PSA - PSA Peugeot - Citroën

The aim of this work is to propose simple analytical tools to predict the fatigue strength of cast aluminium components as a function of the casting process and post-cast treatment. The proposed methodology is based on the Murakami approach to predict the maximum defect size and a flexible modelling framework which leads to the construction of a probabilistic, multiaxial Kitagawa-Takahashi diagram. This framework is capable of modelling two independent co-existing fatigue damage mechanisms. This methodology will be applied to fatigue data taken from the literature as well as tests conducted on AlSi7 cast specimens manufactured via three different processes.

Mots clés: Kitagawa-Takahashi; Al-Si alloy

Domaines: Mécanique [physics.med-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des structures [physics.class-ph]

Viet-Duc Le, Daniel Bellett, Franck Morel, Nicolas Saintier, Thierry Palin-Luc, et al.. A flexible modelling framework leading to a pobabilistic multiaxial Kitagawa-Takahashi diagram : applied to cast Al-Si alloys. 2nd International Symposium on Fatigue Design and Material Defects, Jun 2014, Paris, France. pp.1-3, ⟨10.1051/matecconf/20141202002⟩. ⟨hal-01083703⟩