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A quantitative detection method for metal magnetic memory

A quantitative detection method, metal magnetic memory technology, applied in the direction of material magnetic variable, magnetic field size/direction, etc., can solve problems that are not quantitative methods

Active Publication Date: 2011-12-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

lambda H Varies with the geometric parameters of the defect, this method is not universally quantitative

Method used

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  • A quantitative detection method for metal magnetic memory
  • A quantitative detection method for metal magnetic memory
  • A quantitative detection method for metal magnetic memory

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034]In a specific embodiment of the present invention, a ferromagnetic member composed of iron material is considered, and the crystal structure of iron is body-centered cubic, which belongs to the cubic crystal system. The external stress applied to the ferromagnetic component is Component macroscale strain ε ij uniform strain and non-uniform strain δε ij , denoted as In a specific embodiment of the present invention, the magnetization M of the stress concentration area of ​​the ferromagnetic member is used to characterize the magnetic source, and the characteristic stress field is used Reflecting the stress concentration, here the characteristic stress field in and Represent the elastic modulus tensor and characteristic strain field in the stress concentration area, respectively. Denote the elastic strain as

[0035] The s...

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Abstract

The invention relates to a quantitative detection method adopting metal magnetic memory, which is characterized in that a phase-field method for describing solid-state micro-structure evolution and micro-elastic properties is adopted, external stress of a ferromagnetic component, the geomagnetic field and energy diversity corresponding to internal stress concentration are considered comprehensively, and a quantitative relationship of the external stress, an internal magnetic source of the component and the stress concentration is established based on magnetic domain evolution and structural micro-elasticity. Meanwhile, a quantitative relationship of the magnetic source and a surface magnetic leakage field is established based on properties of a magnetic material around a stress concentration area. Therefore, the micro relationship and the macro relationship are effectively combined, and the interaction of the external stress, the magnetic source in the ferromagnetic component, the stress concentration in the component and the magnetic leakage field is established. When the properties of the material of the ferromagnetic component, the parameters of the macro material and the external stress are given, the magnetic intensity of the magnetic source in the ferromagnetic component and the characteristic stress of the stress concentration area can be determined quantitatively according to the measured signals of the magnetic leakage field.

Description

technical field [0001] The invention relates to a metal magnetic memory quantitative detection method in the field of non-destructive testing. Background technique [0002] Metal magnetic memory detection technology is a non-destructive detection technology for early diagnosis. It was first proposed by Russian scholar Professor Doubov in the 1990s. Once it came out, it has been widely valued by colleagues from all over the world. The main principle of the magnetic memory effect is: under the action of external stress load, the ferromagnetic component will produce elastic strain and magnetostrictive deformation, which will cause the displacement and rotation of the magnetic domain wall, increase the energy of the magnetic field, and cause the magnetoelastic energy The change of the stress concentration area is formed in the discontinuous part inside the component, and the reorientation of the magnetic domain organization caused by this area forms a magnetic pole (equivalent t...

Claims

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Application Information

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IPC IPC(8): G01N27/83G01R33/02
Inventor 刘国强白会娟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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