Nondestructive detection method for detecting damage of metal material

A metal material, non-destructive testing technology, applied in the direction of analyzing materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of poor universality, high requirements on the operation level of inspectors, cumbersome inspection steps, etc., and achieves simple operation. The effect of convenience, strong engineering practical value and high test accuracy

Inactive Publication Date: 2010-09-22
石楠
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Problems solved by technology

[0004] The present invention provides a non-destructive testing method for detecting damage to metal materials to solve the technical problems in the above-mentioned background technology, that is, the detection steps are relatively cumbersome, and at the same time,

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  • Nondestructive detection method for detecting damage of metal material
  • Nondestructive detection method for detecting damage of metal material
  • Nondestructive detection method for detecting damage of metal material

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[0020] In order to better understand the shape, structure and characteristics of the present invention, preferred embodiments will be listed below and described in detail with reference to the accompanying drawings.

[0021] Principle of the present invention is as follows:

[0022] When a direct current flows through a conductor, the current density on the cross section is uniform and the same. When the alternating current passes through the conductor, the current distribution along the conductor cross-section is uneven, and the current density on the surface is larger, and the closer to the center, the smaller, especially when the frequency is high, the current is almost thin near the surface of the conductor. This is the skin effect phenomenon (or called skin effect, skin effect, skin effect).

[0023] The distance that the eddy current penetrates into the conductor is called the penetration depth, and the penetration depth when the eddy current density decays to its surfa...

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Abstract

The invention relates to a nondestructive detection method for detecting damage of metal material, which comprises the follow steps of: (1) applying AC voltage onto the two ends of AB section of the metal material to be detected; (2) maintaining the amplitude of the AC voltage not to be changed, and conforming the initial frequency of the applied AC current; (3) detecting the measured value of CD section to be detected in the metal material to be detected, and recording the data, wherein the CD section is positioned inside the AB section, and the length of the CD section is shorter than that of the AB section; (4) changing the frequency of the AC current applied on the AB section, recording the measured valve corresponding to the CD section at the same time, and obtaining numerical value curve of the change of the measured valve of the CD section along with the frequency change of the AB section; and (5) comparing the obtained numerical value curve with the nondestructive numerical value curve. The nondestructive detection method has simple and convenient operation as well as high measurement accuracy, can visually reflect the damage degree of the metal material to be detected, and has stronger project practical value.

Description

technical field [0001] The invention is a non-destructive testing method for detecting the damage of various metal material test pieces and parts with good or relatively good conductivity, and can be widely used in the design and manufacture of ships, automobiles, aviation, weapons, petroleum, metallurgy and other industries , maintenance and fault diagnosis. Background technique [0002] Metal materials and workpieces will be deformed, worn, scratched, corroded, etc. due to factors such as load, collision, and environmental changes after working, transporting or storing for a period of time, although such damage does not cause direct failure of metal materials or workpieces , but it has obviously reduced the performance of the material and the service life of the workpiece. In such cases, it is necessary to carry out quality inspection on the damaged metal material or workpiece, to evaluate the degree of damage, or to predict the service life in the future. [0003] At pr...

Claims

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Application Information

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IPC IPC(8): G01N27/60G01N27/04
Inventor 石楠左嘉徐
Owner 石楠
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