Method for optimizing thickness in process of simultaneously impacting alloy by using lasers from two sides

The invention discloses a method for optimizing the thickness in the process of simultaneously impacting an alloy by using lasers from two sides. The method comprises the following steps of: simulating a situation that lasers simultaneously impact a target material from two sides by establishing multiple groups of different thicknesses of 2D (2-dimensional) axisymmetric model; and comparing and analyzing a residual stress curve of models with different thicknesses along the axial depth direction to obtain an optimal thickness so that a strengthening effect is the best. The method can be applied to a plurality of fields, such as aircraft turbines, blisks, steam turbines and water turbines in aviation and civil use. As blades of the components are too thin and large in bending torque, the blades are easy to deform and damage when the laser at one side is used for impacting and strengthening; and in addition, during impacting by using the laser from one side, the impact surface represents high-amplitude residual pressure and stress, and meanwhile, the impact back surface represents a tension and stress state, therefore a method for simultaneously impacting the blades by using the lasers from two sides is an effective blade strengthening method.