Optimizing Parameters with FEM Model for 20CrMnTi Laser Shocking

As a new surface treatment technology, laser shock peening (LSP) is a multi-point overlay process of single-point laser shock. In this study, the finite element method (FEM) was used to build a model of single-point laser shock, and the model was verified by experiments. The difference in residual stresses between the experimental and simulated results was less than 20%. Then, the effects of the stress field and deformation of 20CrMnTi with different laser shock parameters were simulated and analyzed. According to the mechanical response of 20CrMnTi to different laser shock parameters, the optimal shocking process parameters for single-point shocking via LSP were determined to be a shock energy of 5 J, a laser pulse width of 20 ns, and an impact number of 5. Lastly, a simulation of multi-point laser shock was performed with the optimal parameters, and the residual compressive stress values of multi-point impacts are close to those of single-point impacts under the same process conditions.

Automated summary

Laser shock peening (LSP) is a novel surface treatment technology that involves multi-point overlay process of single-point laser shock. In this study, a finite element method (FEM) model of single-point laser shock was constructed and verified through experiments, with less than 20% difference in residual stresses between experimental and simulated results. The stress field and deformation of 20CrMnTi under different laser shock parameters were then simulated and analyzed. Based on the mechanical response of 20CrMnTi, the optimal parameters for single-point shocking via LSP were determined to be a shock energy of 5 J, a laser pulse width of 20 ns, and an impact number of 5. Lastly, a simulation of multi-point laser shock was conducted using the optimal parameters, and the residual compressive stress values of multi-point impacts were found to be similar to those of single-point impacts under the same process conditions.