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Portable residual stress measurement device and method

A technology of residual stress and measuring equipment, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of unsuitable residual stress measurement requirements on engineering sites, complicated equipment, etc., and achieve the effect of easy operation and portable equipment

Inactive Publication Date: 2014-12-24
BEIHANG UNIV
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Problems solved by technology

However, the equipment of this kind of system and method is complicated, and it is not suitable for the residual stress measurement requirements of the engineering site

Method used

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  • Portable residual stress measurement device and method
  • Portable residual stress measurement device and method
  • Portable residual stress measurement device and method

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Embodiment Construction

[0026] specific implementation plan

[0027] The residual stress measurement equipment and method provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Such as Figure 2-Figure 5 As shown, the convenient and flexible residual stress measurement method provided by the present invention comprises the following steps in order:

[0029] 1) Prepare the test piece Partially polish the test piece 1, and spray the white primer and black speckle on the test piece in turn.

[0030] 2) Install the component 3, fix the three magnetic brackets of the component 3 on the specimen, adjust the height of the bracket 8 and the electron microscope 4, and turn on the LED lighting 8, so that the microscope 4 can obtain a clear image.

[0031] 3) The calibration plate 6 is placed between the microscope 4 and the test piece 1, the electron microscope 4 takes images of the calibration plate 6, and the internal parameters of the el...

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Abstract

The invention relates to a portable residual stress measurement device and a method. A two-dimensional digital speckle correlation method is used for conducting correlation calculation on speckle images obtained before and after the residual stress of a planar test piece is released, so regional strain fields formed before and after the residual stress of the planar test piece is released are obtained. The stress of the test piece can be released through a drilling device or an impacting indentation device. According to the theoretical equation, used in the drilling method or the impacting indentation method, for the residual stress, the intensity of the residual stress of the test piece is worked out. According to the portable residual stress measurement device, the method for releasing the stress can be flexibly selected according to different needs, and meanwhile the portable residual stress measurement device has the advantages of being high in precision, contactless, convenient and rapid to operate and the like.

Description

technical field [0001] The invention relates to a small and convenient metal plate residual stress measuring device, which belongs to optical measurement experimental mechanics, engineering materials, residual stress measurement of drilling method and residual stress measurement of impact indentation method. technical background [0002] During the manufacturing process, the components will be affected and affected by factors such as various processes; when these factors disappear, if the above-mentioned effects and influences on the components cannot disappear completely, there will still be some effects and influences remaining on the components. Inside, this residual effect and influence is called residual stress or residual stress. Residual stress is the initial stress on the section of the component that has not been loaded yet. During the service process of the component, it is superimposed with the working stress caused by other loads, causing secondary deformation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00
Inventor 李晓星葛宇龙杨岩峰郑航
Owner BEIHANG UNIV
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