Method for detecting material magnetic properties and stress based on Barkhausen principle

Abstract

The invention discloses a method for detecting material magnetic properties and stress based on a Barkhausen noise principle, wherein the method includes the steps: (1) through an envelope line of a Barkhausen noise signal, reckoning a ferromagnetic material magnetic hysteresis loop: (2) extracting stress detection characteristic values on the ferromagnetic material magnetic hysteresis loop: envelope area, center height difference, center width and integral curve area; (3) carrying out magnetic property and stress analysis of a ferromagnetic material by using the stress detection characteristic values, to obtain detection values of the material magnetic properties and stress; and (4) evaluating the stress detection characteristic values, and verifying the accuracy of the material magnetic property and stress detection values obtained by the magnetic property and stress analysis. The Barkhausen noise signal and the magnetic hysteresis loop are correlated in detection, the magnetic properties of the material are directly reflected and determined by the new characteristic values and the stress is detected by the new characteristic values, and the accuracy of stress detection is further improved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of ferromagnetic materials, and relates to a material magnetic property and stress testing method based on the Barkhausen principle. Background technique [0002] Ferromagnetic materials have good adaptability in terms of mechanical properties, so they are widely used as key materials in railway, transportation, energy, construction, aerospace, military and chemical industries. [0003] However, a wide variety of ferromagnetic materials will have great differences in mechanical physical and chemical properties due to different processing techniques, different carbon contents, metallographic structures and different doped alloy composition materials. Moreover, the performance of ferromagnetic materials on conditions such as load, fatigue, corrosion, and service temperature will vary greatly under different application environments. Therefore, it is necessary to obtain material micr...

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Problems solved by technology

But, in prior art, adopt the Barkhausen noise method to carry out stress detection, also there is following defect: 1. Because Barkhausen noise signal is sensitive to the microstructure of material, and the magnetization mechanism and microstructure of ferromagnetic material have Considerable complexity, it is impossible to directly reflect the magnetic properties of the material through the Barkhausen noise eigenvalue, and the Barkhausen noise signal is not related to the hysteresis loop

2. The conventionally used Barkhausen noise eigenvalues, such as ringing number, peak width ratio, etc., are still insufficient when used for stress analysis and corrosion, and cannot reflect the magnetic property information of ferromagnetic materials, and will cause detection results Inaccurate

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