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A magnetic non-destructive testing method for contact damage evaluation of ferromagnetic materials

A technology for non-destructive testing, ferromagnetic materials, applied in the field of measurement, can solve problems such as lack

Active Publication Date: 2017-01-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is still a lack of relevant research on how to effectively invert the damage area and degree based on the magnetic flux leakage signal

Method used

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  • A magnetic non-destructive testing method for contact damage evaluation of ferromagnetic materials
  • A magnetic non-destructive testing method for contact damage evaluation of ferromagnetic materials
  • A magnetic non-destructive testing method for contact damage evaluation of ferromagnetic materials

Examples

Experimental program
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Embodiment Construction

[0033] Taking the detected normal magnetic flux leakage signal of No. 45 steel sample as an example, the specific implementation of the present invention will be further described in detail in combination with the accompanying drawings and examples. Following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention, comprise the following steps:

[0034] step one

[0035] Such as figure 1 As shown, the magnetic sensor is connected to the intelligent magnetic memory instrument through a coaxial cable, and the surface of the test piece in the non-destructive state is measured every 0.2mm by using the pen test magnetic sensor to obtain the initial normal magnetic flux leakage signal of the surface of the tested piece under the initial condition and the initial tangential flux leakage signal (See figure 2 shown); and stored in the intelligent magnetic memory instrument for subsequent signal analysis;

[0036] step ...

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Abstract

The invention discloses a nondestructive examination method for evaluating contact damage of a ferromagnetic material. The nondestructive examination method comprises the steps: detecting a leakage magnetic field on the surface of a ferromagnetic member by using a magnetic sensor to obtain a normal magnetic leakage signal and a tangent magnetic leakage signal on the surface to be examined, storing the normal magnetic leakage signal and the tangent magnetic leakage signal in an intelligent magnetic memory through a coaxial cable; according to the normal magnetic leakage signal and the tangent magnetic leakage signal on the surface to be examined, figuring out a gradient value of normal magnetic leakage and a gradient value of tangent magnetic leakage on the surface to be examined; and providing corresponding contact damage criteria. The nondestructive examination method provides a nondestructive examination means for online monitoring of contact damage of a large quantity of ferromagnetic materials used in the field of industrial application.

Description

technical field [0001] The invention relates to a magnetic non-destructive detection method for early damage of ferromagnetic materials, which belongs to the field of measurement technology. Background technique [0002] Contact is a common form of stress, which is characterized by applying compressive stress on the contact surface, forming stress concentration in the contact area, and causing contact damage on the material surface. Contact damage may cause plastic deformation of the contact surface, causing loosening of component joints, or accelerating the initiation and propagation of fatigue cracks in materials, reducing the service life of materials. Contact damage is ubiquitous in the engineering industry and poses a serious threat to the integrity and safety of equipment. Therefore, from the perspective of structural safety, it is necessary to effectively monitor and evaluate the early damage of materials, the degree of structural performance degradation, and the rem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/83
Inventor 汪越胜姚凯黄亭鲁晓鹏王婷婷杨双景
Owner BEIJING JIAOTONG UNIV
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