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Residual stress testing method based on profile method, and ancillary device

A residual stress and cutting device technology, applied in the field of residual stress detection, can solve the problem that it is difficult to measure enough contour data for small-sized samples, and achieve the effect of lowering the test threshold, taking into account economy and practicability, and reducing test costs

Active Publication Date: 2019-05-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] d. It is necessary to consider the influence of the probe size, it is difficult to measure enough profile data for small-sized samples, etc.

Method used

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  • Residual stress testing method based on profile method, and ancillary device
  • Residual stress testing method based on profile method, and ancillary device
  • Residual stress testing method based on profile method, and ancillary device

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Embodiment Construction

[0066] The invention improves the profile method to test the residual stress, adopts a special linear slow wire cutting device, cuts the sample with the transition zone along the surface to be tested, and uses a laser profiler to scan the cut surface to obtain the deformation Contour data, after data processing, the displacement changes of each point on the cutting surface before and after stress release are obtained. Using the stress-strain relationship, the residual stress distribution of the entire section is finally obtained after finite element analysis. This test method can obtain the stress distribution of the entire section, and has no requirements on the shape and material of the test member, and has the characteristics of cost-effectiveness, high efficiency, and simple operation. The use of the transition zone in the method reduces the influence of the boundary effect and improves the test accuracy.

[0067] Before introducing the residual stress testing method of t...

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Abstract

The invention discloses a residual stress testing method based on the profile method, and an ancillary device. The method is characterized in that a sample is appropriately polished and wiped for pretreatment, and aluminum foils are firmly adhered to cutting paths as transitional belts; the sample, to which the transitional belts are adhered, is cut open through a special linear low-speed wire cutting device along a surface to be detected; the cut surface is scanned through a laser profiler to obtain deformed profile data; and data processing is carried out to obtain displacement changes of points on the cut surface before and after stress relief. The testing method disclosed by the invention has the advantages that finite element analysis is carried out through the stress-strain relationship, so that the residual stress distribution of a whole section is finally achieved; the testing method can achieve the residual stress distribution of the whole section, has no requirements for theshape and the material of a tested component, and has the characteristics of high economy and efficiency, and high simplicity in operation; and through the transitional belts adopted in the method, the influence of edge effect is reduced, so that the testing precision is improved.

Description

technical field [0001] The invention relates to the field of residual stress detection, in particular to a method for testing residual stress inside a structure and a corresponding testing device. Background technique [0002] Residual stress is the main factor that threatens the safety of service components. It will not only reduce the strength of components and produce defects such as deformation and cracks; it will also reduce the fracture toughness, fatigue strength, and stress corrosion resistance of materials. , will greatly increase the risk of equipment failure. In fields with complex and harsh service environments such as energy, chemical industry, aerospace, and transportation, if the residual stress is not effectively detected and controlled, it will often cause inestimable economic and social losses. Therefore, it is necessary to use residual stress measurement technology to accurately detect the stress state of components to evaluate its safety performance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00G01B11/24G01N1/28
Inventor 蒋文春彭伟万娱涂善东孙光爱李建
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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