Analysis of the effect of deep-profile compressive residual stress induced by laser peening on fatigue strength of 7075 aluminum alloy

The effect of laser peening-induced compressive residual stress on the fatigue strength improvement of A7075 specimens was investigated. Rotary bending fatigue tests and residual stress distribution measurements using the sequential polishing method were conducted on untreated, shot-peened, and lase...

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Bibliographic Details
Published in:Results in optics 2024-05, Vol.15, p.100658, Article 100658
Main Authors: Watari, Takeshi, Kine, Yuta, Mitsubayashi, Masahiko, Kabeya, Yuki, Kurita, Takashi, Yoshimura, Ryo, Hirano, Katsuya, Kawashima, Toshiyuki
Format: Article
Language:English
Subjects:
Fatigue strength
High-power laser
Laser peening
Residual stress
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Summary:The effect of laser peening-induced compressive residual stress on the fatigue strength improvement of A7075 specimens was investigated. Rotary bending fatigue tests and residual stress distribution measurements using the sequential polishing method were conducted on untreated, shot-peened, and laser-peened specimens. The results revealed that laser peening provides a deeper compressive stress and a deeper fracture origin, resulting in higher fatigue strength. Furthermore, controlling the laser parameters could extend the depth of the compressive stress layer by approximately 5 mm, indicating the possibility of applying laser peening to thicker materials to improve the fatigue strength.
ISSN:2666-9501
2666-9501
DOI:10.1016/j.rio.2024.100658