Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 164, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.107136
Keywords
Fatigue crack growth; AA7050-T7451; AA2050-T8; L-T and S-T orientations; Microstructure
Funding
- Operational Program for Competitiveness and Internationalization [POCI-01-0145-FEDER-031657, PTDC/EME-EME/31657/2017]
- FEDER/FNR component
- Portuguese Foundation of Science and Technology (FCT)
- State Budget component (OE)
- national funds through FCT - Fundacao para a Ciencia e a Tecnologia [UIDB/00285/2020, LA/P/0112/2020]
- Fundação para a Ciência e a Tecnologia [PTDC/EME-EME/31657/2017] Funding Source: FCT
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The effect of L-T and S-T orientations on FCGR in 7050-T7451 and 2050-T8 aluminum alloys is studied. Lower FCG rates are obtained in the L-T orientation, which can be attributed to increased resistance at grain boundaries. Additionally, crack deflection observed in the L-T direction also affects the FCGR.
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 delta K.
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