Influence of specimen orientation on fatigue crack growth in 7050-T7451 and 2050-T8 aluminium alloys

• Main Author: Jesus, J. S.
• Publication Date: 2022
• Other Authors: Antunes, F. V., Prates, P., Branco, R., Antunes, P. V., Borrego, L. P., Neto, D. M.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10773/34169
• topic: Fatigue crack growth; AA7050-T7451; AA2050-T8; L-T and S-T orientations; Microstructure

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.