Abstract
The residual stress introduced by laser shock peening (LSP) is one of the most important factors in improving metallic fatigue life. The shock wave pressure has considerable influence on residual stress distribution, which is affected by the distribution of laser energy. In this work, a titanium alloy is treated by LSP with flat-top and Gaussian laser beams, and the effects of spatial energy distribution on residual stress are investigated. Firstly, a 3D finite element model (FEM) is developed to predict residual stress with different spatial energy distribution, and the predicted residual stress is validated by experimental data. Secondly, three kinds of pulse energies, 3 J, 4 J and 5 J, are chosen to study the difference of residual stress introduced by flat-top and Gaussian laser beams. Lastly, the effect mechanism of spatial energy distribution on residual stress is revealed.
Highlights
In most case, fatigue cracks are likely to initiate in the materials surface
Nie et al [11] studied the effects of residual stress distribution on TC6 titanium alloy with multiple Laser shock peening (LSP) treatment, and the results showed that the compressive residual stress increased with the increment of the LSP impact
The finite element model (FEM) results show that the compressive residual stress induced by LSP with
Summary
Fatigue cracks are likely to initiate in the materials surface. optimization of the materials surface integrity can effectively improve the reliability of parts and prolong the service life of components [1]. The depth of compressive residual stress induced by LSP can extend to 1 mm, so the processed materials have a robust resistance to crack initiation and propagation, and the fatigue performance is markedly improved [8,9]. Significant work has been conducted in residual stress distribution induced by different LSP parameters such as power density [13], LSP impact [14] and overlapping rate [15]. These investigations mainly focused on the traditional physical LSP parameters. The effect mechanism of spatial energy distribution on residual stress is revealed
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