Method for measuring deviation angle of fatigue microcrack based on nonlinear ultrasound

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United States of America Patent

PATENT NO 11946735
APP PUB NO 20230048646A1
SERIAL NO

17980411

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Abstract

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Disclosed is a method fir measuring a deviation angle of a fatigue microcrack based on nonlinear ultrasound, comprising: preliminarily positioning a fatigue microcrack to obtain a center of the microcrack; selecting a horizontal positive direction, and defining an orientation angle; drawing a positive circumference on a surface of a metal plate, and selecting a fixed interval angle; placing an excitation sensor and a receiving sensor on the drawn positive circumference according to the orientation angle; ultrasonically testing each group of ultrasonic sensing paths, and recording time domain waveform signals formed by each group of ultrasonic sensing paths; converting each group of time domain waveform signals into a corresponding frequency domain graph, extracting an ultrasonic fundamental wave signal amplitude and a second harmonic waveform amplitude, and calculating a relative nonlinear coefficient; drawing an orientation angle-relative nonlinear coefficient polar coordinate graph; and determining a deviation angle of the microcrack.

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Patent Owner(s)

Patent OwnerAddress
SOUTHWEST JIAOTONG UNIVERSITYCHENGDU

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Bing Chengdu, CN 148 1053
Gou, Guoqing Chengdu, CN 1 0
Hu, Yuzi Chengdu, CN 1 0
Jin, Junjun Chengdu, CN 1 0
Qiu, Feifei Chengdu, CN 1 0
Zhu, Zhongyin Chengdu, CN 1 0

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