Influence of specimen orientation on fatigue crack growth in 7050-T7451 and 2050-T8 aluminium alloys. (November 2022)

• Record Type: Journal Article
• Authors: Jesus, J.S.; Antunes, F.V.; Prates, P.; Branco, R.; Antunes, P.V.; Borrego, L.P.; Neto, D.M.
• Is Part Of: International journal of fatigue. Volume 164(2022)
• Publication Date: 2022-11
• Subjects: Fatigue crack growth -- AA7050-T7451 -- AA2050-T8 -- L-T and S-T orientations -- Microstructure; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107136
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Lower FCGR rates are obtained in the L-T orientation. Crack deflection induces: crack closure, longer crack path and lower effective ΔK. Larger cyclic plastic zone in L-T direction leads to higher crack closure level. Abstract: The effect of L-T and S-T orientations on FCGR is here in studied in 7050-T7451 and 2050-T8 aluminum alloys. The Low-cycle fatigue tests and hardness measurements have shown that specimen orientation has a minor effect on material plastic hardening. Lower FCG rates are obtained for both materials in the L-T orientation, which can be associated to the resistance at grain boundaries. The larger cyclic plastic zone attained in the L-T direction leads to an increase of the plasticity inducing crack closure. Crack deflection observed for L-T direction also affects the FCGR due to roughness inducing crack closure, longer crack path and lower effective ΔK.