Fig. 1. Schematics of LSP process. (a) Laser spot overlapping and LSP path; (b) distribution of residual stress test points

Fig. 2. Schematics of energy spatial distribution of laser beam. (a) Gaussian distribution; (b) flat-top distribution

Fig. 3. Surface residual stress distribution of specimens under different energy distributions. (a) Gaussian distribution; (b) flat-top distribution

Fig. 4. Residual stress of specimens along depth direction under different energy distributions

Fig. 5. Relationship between shock wave pressure and plastic deformation under different conditions. (a) Single spot; (b) spot lap

Fig. 6. Mean shock number and measured circle distribution for different spot areas