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Method and system for measuring residual stresses

A residual stress and measurement method technology, applied in the direction of measuring devices, instruments, and mechanical devices, can solve the problems of cumbersome and complicated measurement process and low measurement efficiency, and achieve the effect of improving measurement efficiency and simplifying the measurement process

Inactive Publication Date: 2011-09-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0007] Embodiments of the present invention provide a residual stress measurement method and measurement system, which are used to solve the problems of cumbersome and complicated measurement process and low measurement efficiency of existing measurement methods

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  • Method and system for measuring residual stresses
  • Method and system for measuring residual stresses

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Embodiment Construction

[0059] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0060] First of all, it needs to be explained that the residual stress measurement method and measurement system provided by the embodiment of the present invention are suitable for measuring the residual stress of a certain area on a substrate such as a bent pipe, a metal plate, a metal structural support, and a stressed box.

[0061] Such as figure 2 As shown, the embodiment of the present invention provides a method for measuring residual stress, comprising the following steps:

[0062] Step 201. Acquire a first speckle image of the area to be measured after speckle is sprayed on the surface of the area to be measured.

[0063] Step 202, after drilling holes on the surface of the region to be measured, acquire a second speckle ima...

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Abstract

The invention provides a method and system for measuring residual stresses, which are used for solving the problems of fussy and complexed measuring process and lower measuring efficiency in the traditional measuring method. The method comprises the following steps of: acquiring a first speckle image of a region to be measured after the surface of the region to be measured is sprayed with speckles; acquiring a second speckle image of the region to be measured after the surface of the region to be measured is drilled; determining an axial displacement difference between a first axial point anda second axial point and an annular displacement difference between a first annular point and a second annular point according to the first speckle image, the second speckle image and a digital speckle correlation method; and determining the axial residual stress and the annular residual stress of a position where a hole is in according to the axial displacement difference and the annular displacement difference. By means of the technical scheme, fussy pasting and wiring processes are not required in the measurement process so that the measurement process is simplified, therefore the measurement efficiency of the residual stresses is greatly improved, and the whole deformation field before and after the residual stress of the position, where the hole is in, is released can be acquired.

Description

technical field [0001] The invention relates to the field of metrology and testing, in particular to a method and system for measuring residual stress. Background technique [0002] The pipeline system is an important part of the current mechanical and electrical products. With the development of modern technology, the safety application of pipelines has attracted more and more attention from the engineering community. Among them, the elbow is an important component of the pipeline system. In addition to changing the flow direction of the medium, it can also improve the flexibility of the pipeline, relieve the vibration and restraint of the pipeline, and also compensate for thermal expansion. Since the processing of the bent pipe is a process of plastic deformation of the pipe, this leads to a large residual stress inside the bent pipe. These residual stresses affect the selection of springback compensation in the pipe bending process during processing. In the assembly pro...

Claims

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Application Information

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IPC IPC(8): G01N19/08
Inventor 刘检华宁汝新陈涛唐承统
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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