Simulating investigation of pulsed laser impact LY12-CZ alloy by a hybrid BEM/FEM

A hybrid method of the boundary element method (BEM) and the finite element method (FEM) is proposed to establish the dynamics model before and after pulsed laser impact an LY12-CZ alloy materials, and the model with the size of 30 × 10 × 1 mm3 was obtained by the hybrid BEM/FEM. The modal responses before laser impact and the strengthening effects after laser impact were investigated by simulations and tests. As a result, the eigenvalues and frequencies before laser impact were calculated, and the distribution characteristics of residual stresses and the material’s deformation after different laser impact ways were described by comparing the single-sided, non-simultaneous double-sided, and simultaneous double-sided laser impacts. The results demonstrated that the model was feasible and effective by validating the measured and simulated values. In particular, the significant bending deformation had arisen from the model during single-sided and non-simultaneous double-sided laser impacts, and the maximum deformation amount arrived at 4.36 and 2.31 μm. However, the maximum compressive residual stress in the x direction reached 253.1 MPa during non-simultaneous double-sided laser impact, while the maximum depth of the plastic deformation layer was close to 0.188 mm during simultaneous double-sided laser impact.