Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 136, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105596
Keywords
Two-sided and simultaneous laser shock peening; Foreign object damage; Fatigue performance; Titanium alloy
Funding
- National Natural Science Foundation of China [51975261]
- Natural Science Foundation of Jiangsu Province [BK20160014]
- Innovation Team of Six Talents Peaks in Jiangsu Province [2019TD-KTHY-005]
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Two-sided and simultaneous laser shock peening (TSLSP) was used to strengthen the Ti-6Al-4V titanium alloy. The fatigue crack growth rate of the specimens was investigated by fatigue test. The results show that both direct TSLSP (TSLSP-D) and indirect TSLSP (TSLSP-I) can reduce the fatigue crack growth rate by producing high magnitude compressive residual stress. The maximum fatigue life increases by 94% (TSLSP-D) and 169% (TSLSP-I) compared with the original specimens. Moreover, the TSLSP-D results show decreased resistance to foreign object damage because of decreased plasticity while the TSLSP-I simultaneously achieves superior foreign object damage resistance and fatigue performance.
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