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MAGNETOACOUSTIC EMISSION DETECTION METHOD FOR FATIGUE DAMAGE OF FERROMAGNETIC METAL COMPONENT
MAGNETOACOUSTIC EMISSION DETECTION METHOD FOR FATIGUE DAMAGE OF FERROMAGNETIC METAL COMPONENT
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机译:铁磁金属部件疲劳损伤的磁声发射检测方法
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摘要
A magneto acoustic emission detection method for fatigue damage of ferromagnetic metal components: First, generating an excitation magnetic field by using a sine wave voltage signal, gradually increasing a loading voltage until a magneto acoustic emission signal of a bimodal envelope with an obvious tail peak is acquired, and taking a corresponding voltage peak value as a reference voltage; second, generating an excitation magnetic field by using a square wave voltage signal equal to or higher than a reference voltage, and acquiring a magneto acoustic emission signal with a T-shaped envelope; and third, calculating the average value of peak-to-peak values of the magneto acoustic emission signal in multiple periods to serve as a characteristic parameter, and enabling the characteristic parameter to have inflection point change along with the development of the initiation and expansion of the fatigue crack, and giving a timely early warning for the failure of the component.;
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