Method for healing copper thin film fatigue damages by plurality of times of laser impact

A technology of fatigue damage and laser shock, applied in the fields of mechanical manufacturing and laser processing applications, to achieve the effect of increasing cumulative fatigue life, simple construction, and improved fatigue life

Inactive Publication Date: 2013-09-25
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of improving the fatigue life of polycrystalline copper thin film material

Method used

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  • Method for healing copper thin film fatigue damages by plurality of times of laser impact
  • Method for healing copper thin film fatigue damages by plurality of times of laser impact
  • Method for healing copper thin film fatigue damages by plurality of times of laser impact

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, the method of the present invention is further described, please refer to Figure 1 to Figure 6 , a polycrystalline copper thin film material laser shock healing method, the steps are:

[0030] Step 1): Provide a prefabricated fatigue damage device 1 and a laser shock healing device 2 for metal specimens, the prefabricated fatigue damage device 1 includes a micro-fatigue testing machine A1 and a video microscope A2, and the laser shock healing device 2 includes a pulsed laser B1, Optical path adjusting device B2 and culture dish 23, described optical path adjusting device B2 comprises mirror adjusting device 21, lens adjusting device 22; Reflecting mirror adjusting device 21 is made up of reflecting mirror support, reflecting mirror and slider mechanism, lens adjusting device 22 is made up of lens holder, convex lens and slide block;

[0031] Step 2): Prefabricate fatigue damage to the material and observe it from time to...

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PUM

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Abstract

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.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing and laser processing application, in particular to a method for healing copper film fatigue damage by multiple laser shocks. Background technique [0002] During the working process of various large, small and micro instrument structures in our country, there are different degrees of fatigue damage or cracks in the key parts of their structures, and the annual maintenance and replacement costs are huge. At present, the maintenance of large-scale structural cracked parts usually adopts grinding to remove cracks or patches such as glue joints, riveting, and connections, or through laser welding and redistribution of loads to reduce the stress around the cracks and prevent them from expanding. Strength and longevity of the structure. However, this grinding and repairing method has its obvious disadvantages. In the grinding and repairing process, the overall structural strength will ...

Claims

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Application Information

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IPC IPC(8): C21D1/09
Inventor 尚德广刘小冬靳佳
Owner BEIJING UNIV OF TECH
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