Fatigue behaviour of additively manufactured Ti-6Al-4V alloy: The role of defects on scatter and statistical size effect

Viet-Duc Le (1) , Etienne Pessard (1) , Franck Morel (1) , Serge Prigent (2)

1 LAMPA - Laboratoire Angevin de Mécanique, Procédés et InnovAtion
2 IRT Jules Verne - Institut de Recherche Technologique Jules Verne [Bouguenais]

This work is focused on the influence of defects on scatter and statistical size effect of Ti-6Al-4V alloy fabricated by the SLM process. A vast fatigue test campaign has been undertaken, for two surface conditions (as-built and machined surfaces) and two specimen geometries with different highly loaded volume sizes. It was shown, for machined specimens, that a large variety of crack initiation mechanisms is the principal origin of the fatigue scatter. Regarding the size effect, the change of the mechanism is the first order factor that governs the size effect. For as-built specimens, these effects are much less pronounced.

Mots clés: Mechanical Engineering; Modelling and Simulation; Industrial and Manufacturing Engineering; General Materials Science; Mechanics of Materials; fatigue; fabrication additive; Ti-6Al-4V; SLM; defauts

Domaines: Sciences de l'ingénieur [physics]

Viet-Duc Le, Etienne Pessard, Franck Morel, Serge Prigent. Fatigue behaviour of additively manufactured Ti-6Al-4V alloy: The role of defects on scatter and statistical size effect. International Journal of Fatigue, 2020, 140, pp.105811. ⟨10.1016/j.ijfatigue.2020.105811⟩. ⟨hal-02969486⟩