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Alternating Stress Measuring Device and Method for Ferromagnetic Components

A measuring device and technology of alternating stress, which is applied in the direction of material magnetic variable and the measurement of the change force of material magnetic properties caused by the applied stress, can solve the problems that need to be verified, and achieve the effect of broad application background

Active Publication Date: 2016-01-20
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Alternating Stress Measuring Device and Method for Ferromagnetic Components
  • Alternating Stress Measuring Device and Method for Ferromagnetic Components
  • Alternating Stress Measuring Device and Method for Ferromagnetic Components

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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: Exciting probe 1 magnetizes the component 3 under inspection, and generates a uniform induced current on the surface of component 3. When there is no stress in component 3, the surface induced current flows uniformly; if there is stress on or near the surface of component 3, due to the 3 The distribution and magnitude of the magnetic permeability are different, and the induced current is disturbed in the stress area, which causes the electromagnetic field on the surface 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 ferromagnetic component alternating stress measurement system device and method of the present invention comprise 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 device for measuring alternating stress of a ferromagnetic component and a measuring method thereof. Background technique [0002] Ferromagnetic components are widely used in aerospace, electric power, railways, pressure vessels and other industries. In the stress concentration area, the material structure is prone to dislocation, slip or deformation, which promotes the deterioration of early defects such as component creep, fatigue and corrosion, and even develops. 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, the X-ray diffraction method is more sensitive to the stress of the surface layer of the material and is suitable for measuring components with large residual stress. The disadvantage is that the measurement accuracy is poor and the sensitivity i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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