On-line detecting method for three-dimensional force in closed iron magnetic shell

A detection method and force technology, applied in the direction of material magnetic variables, etc., can solve the problems of shallow penetration depth of X-rays, high risk, and inability to measure stress, etc., and achieve the effect of wide application and simple operation

Inactive Publication Date: 2009-10-07
CHONGQING UNIV
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Problems solved by technology

Infrared thermal imaging can detect weak parts on the shell early, and provide a basis for future key detection; however, the current detection results for infrared detection cannot quantitatively analyze the magnitude of stress
[0007] Radiographic testing is mainly aimed at internal defects of equipment with a shell thickness less than 12mm, and can also measure internal stress; ray testing mainly includes X-ray testing and neutron diffraction, but the penetration depth of X-rays is extremely shallow, and neutron testing , the object to be measured is subject to certain restrictions according to the conditions of the neutron source instrument, and the ray method is costly and dangerous, and it is difficult

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  • On-line detecting method for three-dimensional force in closed iron magnetic shell
  • On-line detecting method for three-dimensional force in closed iron magnetic shell
  • On-line detecting method for three-dimensional force in closed iron magnetic shell

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Embodiment Construction

[0035] The irreversible movement of the magnetic domains of ferromagnetic materials produces Barkhausen noise (see figure 1 , Barkhausen noise manifested in the steepest region of the magnetization curve is a step change) electrical signal at the same time, due to the magnetostrictive effect, the stress wave aroused inside the material is called magnetoacoustic emission (Magnetomechanical Acoustic-Emission for short). Transmit MAE), its frequency is in the ultrasonic range. Magnetoacoustic emission (MAE) corresponds to the Barkhausen effect (Magnetic Barkhausen Noises MBN). effect. Ferromagnetic materials cause magnetic domain wall motion during the magnetization process. Generally, 90° domain wall motion leads to magnetostriction, which is the main source of magnetoacoustic emission; 180° domain wall motion is the main factor that causes the Barkhausen effect. Kusanagi et al. proved that this type of acoustic emission is related to stress, and the material, magnetic field s...

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Abstract

The invention discloses an on-line detecting method for three-dimensional force in closed iron magnetic shell, which adopts Barkhausen magnetic noise detection device, applies variable-frequency electromagnetic excitation and rotating electromagnetic excitation to the iron magnetic shell to be measured, to obtain electromagnetic MBN, MAE signals at different depths in the iron magnetic shell body, performs three-dimensional rebuilding to the MBN, MAE signals, and ultimately detects the three-dimensional stress and flaw distribution in the iron magnetic shell to be measured. The invention has beneficial technology effects of simple operation, wide application range, non harm to human body during operations, and capability of performing three-dimensional scanning and detection to the internal stress and defect in the iron magnetic shell.

Description

technical field [0001] The invention relates to a material internal stress detection technology, in particular to an online detection method for three-dimensional acting force inside a closed ferromagnetic shell. Background technique [0002] A workpiece is assembled with a housing, when the appearance of the workpiece is almost the same as the inner shape of the housing, the workpiece and the housing are closely matched to form a closed ferromagnetic housing. In order to achieve a tight fit between the workpiece and the shell, a large force must be applied during the assembly process. Due to the existence of certain dimensional processing errors in any workpiece, problems such as local stress concentration, local overheating, partial load and under-tight fit are likely to occur on the contact surface of the workpiece and the shell during production and assembly, and even cause cracks inside the material and damage, causing loss or becoming a hidden danger and causing an ac...

Claims

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Application Information

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IPC IPC(8): G01N27/72
Inventor 文玉梅李平
Owner CHONGQING UNIV
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