A process design and fabrication method for laser shock strengthening of rounded corner structures

Abstract

This invention provides a process design and processing method for laser shock strengthening of rounded corner structures. The method includes oblique laser shock strengthening of a flat sample plate using a preferred power density as the processing power density, each spot size in the laser beam spot size set as the processing spot size, and the energy distortion angle corresponding to each spot size in the energy distortion angle set as the laser beam processing incident angle. The method compares the surface residual compressive stress test data of the vertically and obliquely laser-strengthened flat sample plates to obtain the surface residual stress difference between the vertical and oblique directions, and the target laser beam spot size whose number of spots covering the rounded corner structure meets a threshold value. Based on the spot overlap rate and spot size of the target laser beam, the method determines the movement step size, starts laser shock strengthening processing from one side of the rounded corner structure, moves one movement step on the rounded corner structure, and then performs laser shock strengthening processing until the other side of the rounded corner structure is reached.

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