Non-contact Weak Magnetic Detection Method for Crack Initiation Area Stress
A magnetic detection, non-contact technology, applied in the direction of material magnetic variables, etc., can solve the problems of limited application and lack of systematic research on quantitative calculation, and achieve the effect of detecting the degree of stress concentration.
Active Publication Date: 2021-10-12
SHENYANG POLYTECHNIC UNIV
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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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[0142] The present invention comprises the following steps:
[0143] Step 1): Build a magnetic coupling model
[0144] When there is no external force, the magnetic induction of ferromagnetic materials is B 1 ,
[0145] mu 0 mu 1 =B 1 / H (1)
[0146] 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:
[0147]
[0148] Among them, W 1 , W 2 are the energy before and after the ferromagnetic material is subjected to external force, respectively.
[0149] 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 non-contact magnetic field weakening detection method for stress in a crack initiation area belongs to the technical field of non-contact detection of a stress concentration area of a ferromagnetic metal component, and in particular relates to a non-contact magnetic field weakening detection method for a crack initiation area stress. The invention provides a non-contact weak magnetic detection method for crack initiation area stress. The present invention includes the following steps: step 1): establishing a magnetic coupling model; step 2): establishing a J-A stress magnetization model; step 3): establishing a magnetic signal space scattering field model; and calculating the spatial distribution of the scattering field part.
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 method for non-contact weak magnetic detection of stress in crack initiation areas. 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 defor...
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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