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

Type
Articles dans des revues avec comité de lecture
Author
LE, Viet Duc
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
PESSARD, Etienne
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
MOREL, Franck
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
PRIGENT, Serge
302954 IRT Jules Vernes

URI
http://hdl.handle.net/10985/19376
DOI
10.1016/j.ijfatigue.2020.105811
Date
2020
Journal
International Journal of Fatigue

Abstract

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.

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