Journal
OPTICS AND LASER TECHNOLOGY
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2019.105784
Keywords
Fatigue behavior; Residual stress; Foreign object damage; Double-sided laser shock peening; Ti-6Al-4V alloy
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Funding
- Nature Science Foundation of Jiangsu Province [BK20160014]
- National Natural Science Foundation of China [51479082]
- 333 Project of Jiangsu Province [BRA2017389]
- Research Innovation Program for College Graduates of Jiangsu Province [KYCX18_2222]
- Innovation & Entrepreneurship Project of Jiangsu Province
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Foreign object damage (FOD) can seriously shorten the fatigue life of aviation components. On the other hand, double -sided laser shock peening (LSP) has been developed to improve the service-time of thin Ti-6Al-4V alloy specimen by inducing homogeneous compressive residual stresses (CRS). In order to study the effect of FOD on fatigue properties of the double-sided LSP treated specimens, damage characteristics, local stress evolution and fatigue crack propagation laws of FOD specimens were investigated. The results suggest that double-sided LSP can reduce the adverse effect of FOD on the fatigue performances of the specimens by introducing CRS, and the local stress field is relatively stable under fatigue-related conditions, with 25% relaxation after 500 blocks and 40% relaxation after 1000 blocks, thus improving the fatigue properties of specimens.
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