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Quantifying fatigue
cracks in TC4 titanium alloy using a nonlinear modulation
ultrasonic testing method
Zhenhua Chen, Chenggeng Li, Guochen Xu and Chao Lu |
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Vol. 16 (2021), No. 4, 419–428
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Abstract |
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The length of the fatigue cracks is always underestimated by linear ultrasonic testing, for example that the phased array method based on linear ultrasonic technique can be used for detecting the opened crack rather than closed crack. In the paper, a novel nonlinear ultrasonic modulation method is proposed for detecting the closed crack. Firstly, the transducers’ arrangement is optimized to excite the nonlinear ultrasonic response of closed crack. Secondly, the hypothesis of quantitative measurement is given for the closed crack. Finally, the hypothesis is proved to be correct by comparing with the metallographic measurement. The results indicate that the big modulation coefficients can be extracted from the closed crack covered by the superimposed area of sound field, and the length of closed crack which cannot be detected by linear ultrasonic method can be determined by the nonlinear ultrasonic modulation method. |
Keywords
titanium alloy, closed crack, nonlinear modulation
coefficient, ultrasonic array technique
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Milestones
Received: 8 October 2020
Revised: 5 April 2021
Accepted: 20 April 2021
Published: 26 September 2021
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Authors |
| Zhenhua Chen | |
| Key Laboratory of Nondestructive
Testing of Ministry of Education Nanchang Hangkong Universtiy Nanchang, 330063 China |
State Key Laboratory
of Acoustics nstitute of Acoustics, Chinese Academy of Sciences Beijing 100190 China |
| Chenggeng Li | |
| Key Laboratory of Nondestructive
Testing of Ministry of Education Nanchang Hangkong Universtiy Nanchang, 330063 China |
Guangdong Institute of Special
Equipment Inspection and Research Foshan 528251 China |
| Guochen Xu | |
| Key Laboratory of Nondestructive
Testing of Ministry of Education Nanchang Hangkong Universtiy Nanchang, 330063 China |
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| Chao Lu | |
| Key Laboratory of Nondestructive
Testing of Ministry of Education Nanchang Hangkong Universtiy Nanchang, 330063 China |
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