Numerical simulation of 3-D nondestructive marking based on laser shock wave

In order to study the distribution of residual stress and distortion,a FEM model of marking by means of laser shock waves was established based on ANSYS/LS-DYNA.By loading the shock waves induced by laser,a numerical simulation of marking was carried out.The simulated results showed that the mesh of marking area acted by laser shock waves formed a crater with dimension similar to the diameter of the load,and its residual stress was compressive stress.As the amount of the deformation increased gradually,the residual compressive stress in the center of marking area reached the maximum;the residual compressive stress along the thickness of the material declined as the thickness increased,and the loading effect was not obvious in the depth of 1mm~1.4mm.The results are applicable in theoretical analysis and experimental research of residual stress field of 3-D nondestructive marking based on laser shock wave.