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Magnetic memory signal detection method based on improved J-A model

A signal detection, J-A technology, applied in the direction of material magnetic variables, etc., can solve the problems of quantitative analysis, magnetic memory signal force-magnetic coupling mechanism without a unified conclusion, etc.

Active Publication Date: 2018-08-10
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

The magnetic memory method can effectively determine the stress concentration area of ​​ferromagnetic metal components, but neither Newtonian mechanics nor Maxwell's equations have elaborated on the force-magnetic coupling, and there is no unified conclusion on the force-magnetic coupling mechanism of the magnetic memory signal.
In addition, plastic deformation is the main reason for the failure of ferromagnetic metal components, but there is no effective method to quantitatively analyze the characteristics of the magnetic memory signal after the plastic deformation of the material, and the model for the magnetic memory signal is also a bottleneck in this field

Method used

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Embodiment Construction

[0092] The present invention comprises the following steps:

[0093] Step 1): Build a magnetic model

[0094] When there is no external force, the ferromagnetic material is in equilibrium, and the total free energy of the material is:

[0095] E. 0 =E ms +E el +E K (1)

[0096] Among them, E ms is the magnetoelastic energy of the ferromagnetic crystal, which represents the energy generated by the interaction between ferromagnetism and elasticity, expressed as:

[0097]

[0098] In formula (2), B 1 with B 2 are the magnetoelastic coupling coefficients under magnetization and deformation, respectively; α i with alpha j Indicates the angle between the magnetization direction and the corresponding crystal axis; e ii with e ij Indicates the deformation component (i, j=x, y, z)

[0099] E. el is the elastic energy, which means the interaction force between atoms when the material undergoes elastic deformation, according to elastic mechanics:

[0100]

[0101] I...

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Abstract

The invention provides a magnetic memory signal detection method based on an improved J-A model, belongs to the technical field of magnetic memory signal detection of ferromagnetic materials and in particular relates the magnetic memory signal detection method based on the improved J-A model. The invention provides the magnetic memory signal detection method based on the improved J-A model. The magnetic memory signal detection method comprises the following steps: step 1): establishing a magnetomechanical model; step 1): establishing the improved J-A model. The magnetic memory signal detectionmethod further comprises a simulation and modeling part for verifying the accuracy of an algorithm.

Description

technical field [0001] The invention belongs to the technical field of magnetic memory signal detection of ferromagnetic materials, and in particular relates to a magnetic memory signal detection method based on an improved J-A model. Background technique [0002] Pipeline transportation is one of the main methods of international oil and gas transportation. It has the advantages of large transportation volume, not restricted by climate and other ground factors, continuous operation and low cost. [0003] The safety maintenance of long-distance oil and gas pipelines is the core issue of pipeline operation. Judging from the analysis of pipeline accidents in recent years, new pipeline accidents occur frequently, and at this time the macroscopic defects of the pipe body have not been fully formed. Conventional non-destructive testing techniques such as magnetic particle, magnetic flux leakage, eddy current and infiltration have played an important role in pipeline defect monit...

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Application Information

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IPC IPC(8): G01N27/85
CPCG01N27/85
Inventor 刘斌何璐瑶郑思檬张贺任建
Owner SHENYANG POLYTECHNIC UNIV
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