Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint
Joint Authors
Wang, Qingyuan
He, Chao
Kitamura, Kazuhiro
Yang, Kun
Liu, Yong-jie
Chen, Qiang
Source
Advances in Materials Science and Engineering
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-11-27
Country of Publication
Egypt
No. of Pages
10
Abstract EN
Very high cycle fatigue behavior of nugget zone in AA 7075 friction stir welded joint was experimentally investigated using ultrasonic fatigue testing system (20 kHz) to clarify the crack initiation mechanism.
It was found that the fatigue strength of nugget zone decreased continuously even beyond 107 cycles with no traditional fatigue limits.
Fatigue cracks initiated from the welding defects located at the bottom side of the friction stir weld.
Moreover, a special semicircular zone could be characterized around the crack initiation site, of which the stress intensity factor approximately equaled the threshold of fatigue crack propagation rate.
Finally, a simplified model was proposed to estimate the fatigue life by correlating the welding defect size and applied stress.
The predicted results are in good agreement with the experimental results.
American Psychological Association (APA)
He, Chao& Kitamura, Kazuhiro& Yang, Kun& Liu, Yong-jie& Wang, Qingyuan& Chen, Qiang. 2017. Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint. Advances in Materials Science and Engineering،Vol. 2017, no. 2017, pp.1-10.
https://search.emarefa.net/detail/BIM-1124622
Modern Language Association (MLA)
He, Chao…[et al.]. Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint. Advances in Materials Science and Engineering No. 2017 (2017), pp.1-10.
https://search.emarefa.net/detail/BIM-1124622
American Medical Association (AMA)
He, Chao& Kitamura, Kazuhiro& Yang, Kun& Liu, Yong-jie& Wang, Qingyuan& Chen, Qiang. Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint. Advances in Materials Science and Engineering. 2017. Vol. 2017, no. 2017, pp.1-10.
https://search.emarefa.net/detail/BIM-1124622
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1124622