Magnetism in-situ detection method for metal cracking expansion under condition of variable magnetic excitation

A crack propagation and metal technology, applied in the direction of material magnetic variables, can solve the problems of reliability impact of magnetic memory detection technology, difficulty in detection, time-consuming and labor-intensive, etc., to improve detection efficiency and accuracy, reduce detection errors, and reduce time consumption Effect

Inactive Publication Date: 2012-07-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] Since the magnetic memory detection method picks up the weak magnetic signal on the surface of the test piece in the geomagnetic field environment, it is easily affected by factors such as material composition and heat treatment state to cause misjudgment, which affects the reliability of the magnetic memory detection technology and sometimes causes detection failures. Difficult to carry out
At the same time, most of the existing magnetic memory detection methods are out-of-position detection, which requires the probe to scan and move
In the process of crack growth tensile test, multiple scans are often required to effectively find the crack growth process, which is very time-consuming and laborious

Method used

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  • Magnetism in-situ detection method for metal cracking expansion under condition of variable magnetic excitation
  • Magnetism in-situ detection method for metal cracking expansion under condition of variable magnetic excitation
  • Magnetism in-situ detection method for metal cracking expansion under condition of variable magnetic excitation

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Embodiment Construction

[0045] In order to better illustrate the purpose and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] In the embodiment, the 16MnR material commonly used in the pressure vessel is selected to make the tensile test piece. The effective width of the test piece is 26mm, and the thickness of the test piece is 4mm. A 5mm×1mm macroscopic crack defect is prefabricated in the center of the test piece. main structure size Figure 5 shown.

[0047] In this embodiment, the magnetic sensor adopts the GaS high-sensitivity Hall sensor developed by the Institute of Semiconductors, Chinese Academy of Sciences. Its dimensions are 1.5mm×1.7mm, the sensitivity is 10mv / mA.KGs, the linearity is 0.1%, and the working temperature is - 40℃~+125℃; the input resistance is 0.67KΩ, and the output resistance is 0.96KΩ.

[0048] The exciting device in this embodiment is composed of t...

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Abstract

The invention relates to a magnet in-situ detection method for metal cracking expansion under the condition of variable magnetic excitation, which belongs to the technical field of nondestructive detection for metal damage and fatigue process. The method adopts a miniature Haul device to form an array type sensor, and utilizes an adjustable magnetic field signal and an appropriate excitation method to remove the interference of stray magnetic fields specific to different magnet materials so as to obtain an optimal detection effect. The magnetism in-situ detection method adopts an array type probe, does not need to move a detection mechanism, utilizes abnormal change information of a weak magnetic signal when the cracking of ferromagnetic materials expands to achieve real-time in-situ detection of the cracking expansion, and has the advantages of being free of contact, high in detection efficiency, simple, convenient, low in cost and the like.

Description

technical field [0001] The invention relates to a magnetic in-situ detection method for metal crack expansion under the condition of changing magnetic excitation, and belongs to the technical field of non-destructive detection of metal damage and fatigue process. Background technique [0002] Crack is a major form of metal damage, and it is the main cause of failure of metal components. The failure of metal components may cause the entire equipment to face serious threats such as failure, fracture, explosion, etc., especially for aerospace, electric power, transportation equipment and other important areas related to people's livelihood, which will cause disastrous consequences. To ensure effective equipment operation, it is imperative to reliably detect potential crack-prone areas on loaded metal components before component failure. [0003] In recent decades, non-destructive testing has developed rapidly, and a variety of testing methods have been applied to crack detecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
Inventor 张卫民刘书选邱勇涂青松陈成峰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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