Electromagnetic frequency mixing detection method used for ferromagnetic material fatigue damage detection
A ferromagnetic material and fatigue damage technology, applied in the direction of material magnetic variables, etc., can solve problems such as few reports, and achieve the effect of facilitating accurate characterization and reducing influence
Pending Publication Date: 2019-09-20
BEIJING UNIV OF TECH
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Problems solved by technology
It can be seen that at this stage, the electromagnetic mixing detection technology is mainly used in the measurement of the thickness of fluid nano-magnetic particles and magnetic films. The detection of mixed-frequency signals has the characteristics of high sensitivity and high signal-to-noise ratio. rarely reported
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[0046] Below in conjunction with concrete experiment the present invention will be further described:
[0047] The implementation process of this experiment includes the following steps:
[0048] 1. Experimental system construction: according to figure 2 The system diagram of the detection device is shown to build an experimental system. The system includes a computer 1, a signal excitation acquisition board 2, a power amplifier 3 and an electromagnetic mixing sensor 4. Firstly, the computer 1 is connected with the signal excitation acquisition board, which is used to control the excitation of the magnetic mixing signal and the display, analysis and processing of the detection signal. The output port of the signal excitation acquisition card 2 is connected to the input port of the power amplifier for amplifying the excitation signal. Next, the output end of the power amplifier 3 is connected to the input end of the electromagnetic mixing sensor 4 for the sensor to magnetize ...
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The invention discloses an electromagnetic frequency mixing detection method used for ferromagnetic material fatigue damage detection. The method comprises the following steps of determining a magnetic field frequency mixing signal detection direction of an electromagnetic frequency mixing sensor according to a size and a material of a tested device; selecting a certain signal acquisition position, attaching the sensor to a surface of a ferromagnetic component, exciting a high-low-frequency modulated sine signal as a mixed excitation signal, and carrying out electromagnetic frequency mixing detection; using a computer to process collected magnetic frequency mixing nonlinear signals; and using a tangential magnetic field of a test piece surface and magnetic flux density in the test piece to draw a hysteresis loop, and calculating electromagnetic frequency mixing characteristic parameters, and acquiring a characterization result diagram of an electromagnetic frequency mixing power law coefficient which changes with fatigue damage degrees of different test pieces. Through analyzing and processing the electromagnetic frequency mixing signals and using the electromagnetic frequency mixing power law coefficient to characterize material hardness changes, an influence of a fundamental frequency noise on the characterization parameters can be effectively weakened, which is beneficial to accurate characterization of the material fatigue damages.
Description
technical field [0001] The invention relates to a characterization method for early damage of ferromagnetic materials, in particular to a characterization method for fatigue damage of ferromagnetic materials based on electromagnetic mixing technology. This method is suitable for early fatigue damage characterization of ferromagnetic materials, and belongs to the field of nondestructive testing. Background technique [0002] As a common bearing member, ferromagnetic materials are widely used in aerospace, electric power, railway, pressure vessel and other industries. During the use of these components, under the action of fatigue load, internal working medium or external environmental factors, fatigue damage is likely to occur in the unevenness of the structure, loose areas, cavities and dislocation defect concentration areas, resulting in fatigue fracture, resulting in Major vicious safety accident. Therefore, timely and effective detection of the severe fatigue damage are...
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IPC IPC(8): G01N27/85
CPCG01N27/85
Inventor 焦敬品常予李光海吴斌何存富
Owner BEIJING UNIV OF TECH