Laser & Optoelectronics Progress, Volume. 60, Issue 1, 0114002(2023)
Residual Stress and Fatigue Property of Laser Shock Peening 2050 Aluminum-Lithium Alloy
Laser shock peening (LSP) is an advanced surface modification technique for anti-fatigue manufacturing. In this paper, the orthogonal test method was employed to investigate the distribution of residual stress on the surface of 2050 aluminum-lithium alloy. The correspondingly optimal LSP parameters were obtained. Furthermore, the fatigue life extension was verified with these parameters. Results show that there is a strong correlation between the LSP-induced residual stress and the geometric characteristics of the specimen. For the LSP parameters which affected residual stress, the effect of overlapping rate is greater than laser energy, and further more significant than impact times. The optimal LSP parameters are laser power density of 5.30 GW·cm-2, overlapping rate of 50%, and peened twice. With the optimal LSP parameters, the fatigue life increased by 22% and 63% at 260 MPa and 200 MPa stress level, respectively.
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Rujian Sun, Ziwen Cao, Xiaoguang Ma, Zhigang Che, Shikun Zou, Junfeng Wu. Residual Stress and Fatigue Property of Laser Shock Peening 2050 Aluminum-Lithium Alloy[J]. Laser & Optoelectronics Progress, 2023, 60(1): 0114002
Category: Lasers and Laser Optics
Received: Oct. 28, 2021
Accepted: Nov. 29, 2021
Published Online: Dec. 5, 2022
The Author Email: Sun Rujian (rukingson@163.com)