The invention provides a method for healing
copper thin film fatigue damages by a plurality of times of
laser impact and relates to the technical field of machinery manufacturing and
laser machining application. The method comprises the following steps: providing a
fatigue damage prefabrication device and a
laser impact healing device, wherein the
fatigue damage prefabrication device comprises a micro-fatigue tester and a video
microscope; the laser
impact healing device comprises a pulse laser device, a light path adjusting device and a culture dish; carrying out
fatigue damage prefabrication on a material and carrying out constant observation on the material; spraying a black
coating which is not dissolved in water on the surface of a thin
film material which is subjected to the fatigue damage prefabrication; fixing the material on a
metal base body so that a laser beam is vertically emitted to the surface of the material; placing the
metal base body for fixing the material into the culture dish filled with the water; taking the material from the
metal base body down and placing the material into an
acetone reagent for washing; cleanly washing the black
coating coated on the material; repeating the process for 1-4 times. According to the method disclosed by the invention,
crystal grains on the surface and the sub-surface of the material are continuously thinned, the working hardening degree is continuously improved and the accumulated fatigue life of the material is prolonged to the greatest extent.