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Measuring device and measuring method for alternating stress of ferromagnetic component

A technology of alternating stress and measuring device, which is applied to the measurement of magnetic variables of materials and the measurement of force by measuring the change of magnetic properties of materials caused by applied stress, which can solve problems to be verified and achieve the effect of broad application background.

Active Publication Date: 2014-01-08
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

The magnetic memory method is a non-destructive testing method that can be applied to the early diagnosis of ferromagnetic materials, but the relationship between the evaluation index and the stress needs to be verified in engineering practice

Method used

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  • Measuring device and measuring method for alternating stress of ferromagnetic component
  • Measuring device and measuring method for alternating stress of ferromagnetic component
  • Measuring device and measuring method for alternating stress of ferromagnetic component

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Embodiment Construction

[0017] Such as figure 1 As shown, the detection principle of the method of the present invention is as follows figure 1 Shown: Excite the probe 1 to magnetize the inspected component 3 and generate a uniform induced current on the surface of the component 3. When there is no stress in the component 3, the surface induced current flows uniformly; if there is stress on the surface or near the surface of the component 3, the component 3 The magnetic permeability distribution and size difference, the induced current is disturbed in the stress area, which causes the surface electromagnetic field of the component 3 to change. The detection probe 2 picks up the induced magnetic field above the stress area, and the stress information can be obtained through signal conditioning and analysis.

[0018] Such as Figure 2~3 As shown, the device and method of the alternating stress measurement system for ferromagnetic components of the present invention includes the following steps:

[0019] (1)...

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Abstract

The invention discloses a measuring device and a measuring method for alternating stress of a ferromagnetic component, is used for measuring the stress direction and the stress intensity of the ferromagnetic component, and belongs to the field of nondestructive measuring technologies and devices. The measuring device comprises a signal excitation module, an excitation probe, a detecting coil, a signal conditioning module, a signal acquisition module and a computer signal processing analysis module. The measuring device and the measuring method disclosed by the invention have the substantial characteristics that a to-be-detected component is magnetized by utilizing a U-shaped probe with an alternating signal, so that stress area is enough in secondary induced magnetic field, and then, an induced magnetic field of representing stress information is picked up by the detecting coil, and therefore, the goal of identifying the stress is achieved. According to the measuring method, by utilizing a set of detecting systems, not only can the stress degree of the surface and the near surface of the ferromagnetic component be evaluated but also the major stress direction in the component can be determined. The measuring device and the measuring method for the alternating stress of the ferromagnetic component are wider in application prospect.

Description

Technical field [0001] The invention relates to a ferromagnetic component alternating stress measuring device and a measuring method thereof. Background technique [0002] Ferromagnetic components are widely used in aerospace, electric power, railways, pressure vessels and other industries. The material structure is prone to dislocation, slippage or deformation in the stress concentration area, which promotes the deterioration of early defects such as creep, fatigue and corrosion of the component, and even development Macroscopic defects such as cracks will result in damage to the components. Therefore, it is of great significance to detect the stress of ferromagnetic components. [0003] At present, there are many non-destructive methods applied to the stress detection of ferromagnetic components. Among them, X-ray diffraction is more sensitive to the stress of the surface layer of the material, and is suitable for measuring components with larger residual stress. The disadvantage...

Claims

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Application Information

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IPC IPC(8): G01L1/12G01N27/83
Inventor 宋凯张丽攀李俊江周松
Owner NANCHANG HANGKONG UNIVERSITY
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