A Semi-Analytical Calculation Method of Magnetic Field for Eddy Current Nondestructive Testing Containing Columnar Defects

Abstract

The invention discloses a semi-analytical calculation method for the magnetic field of eddy current non-destructive testing containing columnar defects. Using mathematical physics and electromagnetic field principles, the precise analytical expression of the magnetic vector potential in the Lagrangian domain is obtained, and the magnetic vector potential level is calculated based on MATLAB. The complex expressions in numerical form are inversely transformed by numerical Laplace, and the time-domain solution of eddy current nondestructive testing signals in conductors with columnar defects is obtained. The invention can accurately and efficiently calculate the eddy current non-destructive testing magnetic field of the conductor containing columnar defects, and provides a theoretical basis for the eddy current non-destructive testing technology in the field of defect quantitative identification.

Description

technical field [0001] The invention belongs to the technical field of defect detection of metal test pieces, and in particular relates to the design of a semi-analytic calculation method for an eddy current nondestructive detection magnetic field containing columnar defects. Background technique [0002] In the field of defect detection of metal specimens, the eddy current nondestructive testing method has many advantages compared with other testing methods, such as high detection accuracy, low cost, no need for couplant, safe and green to the human body and the environment. Exploring the relationship between the electromagnetic field signal, the excitation source signal and the defect information, that is, the research on the forward problem of eddy current nondestructive testing is the basis of eddy current defect identification, and has theoretical guiding significance for the development of testing instruments in actual engineering. [0003] At present, there are three ...

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Problems solved by technology

[0007] (1) The numerical solution obtained by finite element simulation cannot know the explicit relationship between model material, defect size and electromagnetic field signal;

[0008] (2) When the model is divided into meshes during the finite element simulation process, the model is discretized, resulting in calculation errors in the solution results;

[0009] (3) When using finite element simulation software for simulation, due to the large amount of calculation, the requirements for computer configuration are very high, and the calculation time is long and the calculation efficiency is low

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