Method for discriminating stress concentration of ferromagnetic materials by utilizing detection of metal magnetic memory

A metal magnetic memory and stress concentration technology, applied in the direction of material magnetic variables, can solve the problems of missed diagnosis or misdiagnosis, metal magnetic memory detection signal noise, etc., to achieve the effect of eliminating interference and high discrimination accuracy.

Inactive Publication Date: 2010-06-02
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there is noise in the metal magnetic memory detection signal at present, and the signal must be processed, and whether it is a stress c

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  • Method for discriminating stress concentration of ferromagnetic materials by utilizing detection of metal magnetic memory
  • Method for discriminating stress concentration of ferromagnetic materials by utilizing detection of metal magnetic memory

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Embodiment Construction

[0020] The specific implementation manner of the present invention is described in conjunction with the detection of the stress concentration of ferromagnetic materials by using a stress concentration magnetic detector with two scanning channels.

[0021] The specific steps are:

[0022] Step 1, pre-inspection preparation, remove the ferromagnetic components around the ferromagnetic material to be inspected, and calibrate the magnetic measuring instrument according to the relevant technical documents of the stress concentration magnetic detector;

[0023] Step 2, according to the detection method of the stress concentration magnetic detector, open at least two scanning channels of the stress concentration magnetic detector, and measure the normal magnetic field strength H on the surface of the detection object-ferromagnetic material along a length direction y (x) and tangential magnetic field strength H x (x), wherein x is the longitudinal direction coordinate value;

[0024...

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Abstract

The invention provides a method for discriminating stress concentration of ferromagnetic materials by utilizing detection of metal magnetic memory, which belongs to the field of metal nondestructive detection. The method adopts a stress concentration magnetic detector at least comprising two scan channels, and specifically comprises the following: step 1, preparing for pre-detection; step 2, using the stress concentration magnetic detector to measure normal magnetic field intensity Hy(x) and tangential magnetic field intensity Hx(x) on the surface of a detected ferromagnetic material along a length direction; step 3, performing arithmetic mean on the acquired normal magnetic field intensity Hy(x) and tangential magnetic field intensity Hx(x) of two or more channels respectively; Step 4, performing smoothed data filtering on data after arithmetic mean; step 5, performing wavelet filtering on the data after smoothed data filtering; step 6, calculating normal magnetic field gradient, tangential magnetic field gradient and peak-to-peak value according to the data after wavelet filtering calculation; and step 7, discriminating stress concentration.

Description

technical field [0001] The invention belongs to the field of metal non-destructive testing, and in particular relates to a method for detecting stress concentration of ferromagnetic materials by using metal magnetic memory. Background technique [0002] In modern industry, a large number of ferromagnetic metal components, especially boiler pressure vessels, pipes, bridges, railways, steam turbine blades, rotors and important welded parts, etc., will bear fatigue loads to varying degrees during use, resulting in fatigue cracks. Frequency damage failure occurs. Since fatigue cracks mostly originate in stress concentration areas caused by microscopic defects on the surface or near the surface, it is of great significance to effectively implement stress detection on the surface and near the surface of components for the safe use of ferromagnetic material components. Currently, non-destructive testing methods are commonly used to search for defects such as cracks, pores, and inc...

Claims

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Application Information

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IPC IPC(8): G01N27/72
Inventor 高立新翟奋楼苏善斌崔玲丽胡邦喜陈建华肖永刚刘丽梅翟晨辉张天睿钱玉华
Owner BEIJING UNIV OF TECH
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