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Stress non-contact weak magnetism detection method

A magnetic detection, non-contact technology, applied in the direction of material magnetic variables, etc., can solve problems such as limited application and lack of systematic research in quantitative calculation.

Active Publication Date: 2018-08-03
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, metal magnetic memory detection technology has been developed to the point where non-contact detection is possible. At present, many experts in the world have devoted themselves to the research on the mechanism of magnetic memory signal generation, and have achieved certain results. There is a lack of systematic research on the quantitative calculation of non-contact detection based on the degree of force concentration, which limits the application of the magnetic memory method in the field of non-contact detection engineering technology in a weak magnetic environment

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  • Stress non-contact weak magnetism detection method
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  • Stress non-contact weak magnetism detection method

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Embodiment Construction

[0141] The present invention comprises the following steps:

[0142] Step 1): Build a magnetic coupling model

[0143] When there is no external force, the magnetic induction of ferromagnetic materials is B 1 ,

[0144] mu 0 mu 1 =B 1 / H (1)

[0145] where μ 0 is the vacuum permeability, μ 1 is the relative permeability of the ferromagnetic material under no stress, and the external magnetic field intensity is H; when there is an external force, the magnetic induction intensity of the ferromagnetic material is B 2 , the energy increment of the ferromagnet under the action of external force is:

[0146]

[0147] Among them, W 1 , W 2 are the energy before and after the ferromagnetic material is subjected to external force, respectively.

[0148] When the ferromagnet is subjected to an external force, the crystal undergoes a corresponding phase transition, and the external stress increases the stress energy in the ferromagnetic crystal, resulting in a magnetoelasti...

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Abstract

The invention discloses a stress non-contact weak magnetism detection method, belongs to the technical field of ferromagnetic metal component stress concentration area non-contact detection and particularly relates to the stress non-contact weak magnetism detection method. The invention provides the stress non-contact weak magnetism detection method which comprises the following steps of step 1),establishing a magnetomechanical coupling model; step 2) establishing a J-A stress magnetization model; and step 3) establishing a magnetic signal space scattered field model. The stress non-contact weak magnetism detection method also comprises a verification test.

Description

technical field [0001] The invention belongs to the technical field of non-contact detection of stress concentration areas of ferromagnetic metal components, and in particular relates to a stress non-contact weak magnetic detection method. Background technique [0002] Large-scale ferromagnetic metal components will have different degrees of fatigue damage in the process of working in complex environments. During the operation of oil and gas pipelines, due to construction, corrosion, and external forces, stress damage will occur, resulting in defects such as deformation, corrosion, and cracks, resulting in pipeline failures. The situation is gradually deteriorating, which has planted a major security risk, posing a threat to national property and people's lives. [0003] As a new non-destructive testing method in the 21st century, the metal magnetic memory testing method is a practical and usable testing method for structural stress and deformation state, and can accurately ...

Claims

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Application Information

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IPC IPC(8): G01N27/85
CPCG01N27/85
Inventor 刘斌马泽宇王缔何璐瑶张贺任建
Owner SHENYANG POLYTECHNIC UNIV