Soldered joint stress concentration testing device and stress concentration testing method based on laser speckle technology

A technology of welding joints and laser speckle, which is applied in the interdisciplinary fields of materials science, optics and mechanics, can solve problems such as poor flexibility, inability to measure actual components, and cumbersome and complicated process of adjusting the optical path, so as to reduce errors and save the cumbersome adjustment of the optical path work, the effect of error reduction

Inactive Publication Date: 2013-09-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing laser speckle technology has a cumbersome and complicated process of adjusting the optical path, and the flexibility is po

Method used

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  • Soldered joint stress concentration testing device and stress concentration testing method based on laser speckle technology
  • Soldered joint stress concentration testing device and stress concentration testing method based on laser speckle technology
  • Soldered joint stress concentration testing device and stress concentration testing method based on laser speckle technology

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specific Embodiment approach 1

[0035] Specific implementation mode 1. Combination figure 1 This embodiment is specifically described. The device for stress concentration testing of welded joints based on laser speckle technology described in this embodiment includes a digital CCD camera 1, two collimating beam expanders 2, a single-mode laser 3, a fiber coupler 4, Optical fiber beam splitter 5 and computer 6,

[0036] After the laser light emitted by the single-mode laser 3 is coupled by the fiber coupler 4, it is sent to the fiber beam splitter 5 through the optical fiber. The optical fiber is sent to two collimating beam expanders 2,

[0037] The two collimated parallel laser beams emitted by the two collimated beam expanders 2 irradiate the welded joint area on the surface of the test piece to form a speckle field, and the two collimated parallel laser beams are located on both sides of the normal of the tested surface And the angle with the normal is the same, and the axes of the two collimated parall...

specific Embodiment approach 2

[0047]Embodiment 2. The difference between this embodiment and the device for stress concentration testing of welded joints based on laser speckle technology described in Embodiment 1 is that the digital CCD camera 1 is an industrial camera with 1.3 million pixels, and the The lens of the camera is a microscopic magnifying lens.

specific Embodiment approach 3

[0048] Embodiment 3. The difference between this embodiment and the device for stress concentration testing of welded joints based on laser speckle technology described in Embodiment 1 is that the single-mode laser 3 is a single-mode He-Ne laser.

[0049] The single-mode He-Ne laser described in this embodiment is a single-mode He-Ne laser with a power of 40 mW.

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Abstract

The invention relates to a soldered joint stress concentration testing device and stress concentration testing method based on the laser speckle technology. The soldered joint stress concentration testing device and stress concentration testing method based on the laser speckle technology solves the problems that according to an existing laser speckle technology, a process for regulation of a light path is cockamamie and complex, flexibility is poor, and the existing laser speckle technology can be only used for laboratory measurement analysis and cannot carry out on-site measurement on actual components with large sizes and complex space shapes. Two collimation beam expanding mirrors are adopted in the soldered joint stress concentration testing device and stress concentration testing method and are arranged above a tested piece symmetrically, two beams of collimation light can be obtained, a digital CCD camera is used for collecting two speckle field images loaded before and after deformation respectively, model reduction processing is carried out on the two speckle field images through a computer, and then a bar chart reflecting a deformation condition can be obtained to further achieve testing and analysis of a stress concentration state. The soldered joint stress concentration testing device and stress concentration testing method is applied to crossing fields of materials science, optics and mechanics.

Description

technical field [0001] The invention relates to the cross fields of material science, optics and mechanics, in particular to a device and a stress concentration test method for welded joint stress concentration tests based on laser speckle technology. Background technique [0002] Laser speckle interferometry, also known as electronic speckle interferometry, is an optical-based, full-field, non-contact non-destructive measurement and detection technology. When a beam of coherent light is irradiated on a flat and rough reflective surface, the diffusely reflected light waves are superimposed on each other, forming a speckle-like distribution of light and dark, that is, the speckle field. The speckle field records the geometric information of the surface of the object. Using appropriate optical path and image processing technology, the surface displacement, strain, roughness, three-dimensional shape, etc. can be measured and detected. [0003] Due to the existence of weld rein...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 刘雪松潘海博闫忠杰尚哲王帅丽王强李书奇王为董志波方洪渊
Owner HARBIN INST OF TECH
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