Method for identifying absolute stress of steel component based on transverse wave spectrum analysis

A technology of frequency spectrum analysis and identification method, which is applied in the field of absolute stress identification of steel components, can solve the problems of high sampling rate of sampling equipment, limited application, and high-frequency noise influence of test results, etc.

Active Publication Date: 2017-11-03
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, the above method is based on the measurement of ultrasonic sound time, and there are two deficiencies. First, the measurement method based on sound time requires a high sampling rate of the sampling equipment, usually above 1GS / s; second, the test results are less affected by high-frequency noise. Big
This limits the application of the above methods in complex environments to some extent

Method used

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  • Method for identifying absolute stress of steel component based on transverse wave spectrum analysis
  • Method for identifying absolute stress of steel component based on transverse wave spectrum analysis
  • Method for identifying absolute stress of steel component based on transverse wave spectrum analysis

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Embodiment 1

[0043] Embodiment 1 Test method of the present invention and relevant principle explanation

[0044] The principle of the absolute stress identification method of steel members based on shear wave spectrum analysis is as follows.

[0045] When absolute stress exists in the steel member under test, the stress induces acoustic anisotropy of the material. When a beam of shear wave propagates along the direction perpendicular to the stress, the shear wave can be decomposed into two wave components, among which, the wave component whose polarization direction is parallel to the stress direction and the wave component whose polarization direction is perpendicular to the stress direction have different propagation speeds, this phenomenon It is called birefringence, and it is a phenomenon unique to transverse waves.

[0046] Such as image 3 Shown is a schematic diagram of the shear wave propagating in the steel member, where the contact point of the shear wave probe and the steel m...

Embodiment 2

[0098] Embodiment 2 The method for identifying the absolute stress of steel components based on shear wave spectrum analysis in the present invention is used for testing the absolute stress of steel components

[0099] In order to further verify the accuracy of the method of the present invention for detecting the absolute stress of steel components, the following tests and comparative tests for detecting the absolute stress of steel components were done.

[0100]No. 65 high-quality structural steel can not only be used in load-bearing components of building steel structures, but also widely used in mechanical welding and parts processing. Therefore, the study on the identification of absolute stress of steel members by using the spectrum analysis method with No. 65 high-quality structural steel as the object has reference significance for the study of welding residual stress detection and loading stress detection. A series of steel components were manufactured and processed b...

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Abstract

The invention provides a method for identifying the absolute stress of a steel component based on transverse wave spectrum analysis. According to the method, the absolute stress of the steel component is solved by calibrating the correlation coefficient between the stress of transverse waves on a replica of an in-service steel component and the reciprocal of a first characteristic frequency and by detecting a first characteristic frequency value of an amplitude spectrum curve of the propagation signals of the transverse waves on the in-service steel component. The invention has the beneficial effects that non-destructive testing of the absolute stress of the in-service steel component can be realized; requirements on the sampling rate of a data acquisition system during testing is not high; and the testing is barely affected by the high-frequency noise of an environment.

Description

technical field [0001] The invention relates to a method for identifying the absolute stress of a steel component, in particular to a method for identifying the absolute stress of a steel component based on shear wave spectrum analysis. Background technique [0002] The absolute stress of steel members is an important index for evaluating the performance of steel structures under construction and in operation. It is of great significance to use effective and reliable means to detect the absolute stress of steel members in service to ensure the safety of steel structures. Especially for steel structures that have been in service for a long time and experienced natural disasters, the spatial stress state may be redistributed, and local components may produce stress concentration, which may lead to partial or even overall failure of the steel structure. Therefore, it is of great significance to study the absolute stress non-destructive testing of steel structure components for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0234G01N2291/0258G01N2291/02827G01N2291/0422G01N2291/101
Inventor 李祚华何京波杨晨滕军
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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