Author
Ghobadlou, Ali Hosseinzadeh, Salahi, Salar, Radi, Amin, Sajadifar, Seyed Vahid, Yapıcı, Güney Güven
Publication Date
2021-11
Publication Place
-
Springer
Subject
Cyclic response, Fracture, Friction stir welding, Low-cycle fatigue, Mechanical behavior, Pure copper
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1059-9495
Record ID
2bf0013a-8197-4a65-b4ab-b5230f58b915
Library Location
Mechanical Engineering
Date
2021-11
Notes
Ozyegin University
Sample Text
Investigation of the fatigue response of friction stir-welded (FSWed) joints is especially important in the design and manufacturing of components with exposure to cyclic loading. In this study, cyclic response of FSWed pure copper joints is investigated in the low-cycle fatigue regime. Microstructural characterizations revealed that FSW introduced a severely deformed microstructure in the nugget zone (NZ). Fatigue response was determined at a strain ratio of 0.1 by varying the total strain amplitude from 0.1 to 0.6%. Cyclic softening was observed for the low strain amplitude of 0.1%, whereas hardening was detected at higher strain amplitudes. The hysteresis loops demonstrated symmetricity along with noticeable linear behavior after the reversals. Typical fractures occurred in the heat affected zone (HAZ) rather than the NZ or the base metal due to grain coarsening of the HAZ. Improved cyclic properties of the NZ along with stable behavior up to 1000 cycles at a total strain amplitude of 0.3% were attributed to its fine and homogeneous microstructure. Moreover, fracture surface analysis demonstrated a ductile behavior represented by dimples in the sample strained at 0.1% in contrast with a brittle fracture surface of the sample fatigued at 0.5% strain amplitude.
DOI
10.1007/s11665-021-06034-2
Cilt
30
