Nonlinear Ultrasonic Phased Array Imaging for Fatigue Crack Propagation Location Detection

doi:10.3901/JME.2024.24.025

Abstract

Abstract: A nonlinear ultrasonic phased array imaging method is developed for fatigue crack growth monitoring. An equivalent amplitude modulation of incident wave is realized through two phased array focusing modes of physical focusing and virtual focusing. The nonlinear harmonic generation is analyzed indirectly by using the fundamental frequency energy loss ratio. The nonlinear imaging detection of closed fatigue crack under conventional phased array hardware conditions is realized, and verified by second harmonic scanning. This method was further applied to the monitoring of fatigue crack growth process, and its ability of quantifying crack size, detecting early damage and monitoring fatigue life was investigated with the aid of micro measurement. The results show that compared with conventional linear ultrasonic phased array, nonlinear ultrasonic phased array imaging detect the closed part of fatigue crack more effectively. The method is sensitive to early damage, and effective detection can be achieved from about 16% of the fatigue life, and the fatigue crack size can be accurately quantified and the crack propagation can be monitored. This method has a good development prospect in service structure life research and emergency prevention.

Key words: phased array, nonlinear imaging, fatigue crack, monitoring

CLC Number:

TG156

TENG Da, LIU Zhiyong, LIU Lishuai, XIANGYanxun, XUANFuzhen. Nonlinear Ultrasonic Phased Array Imaging for Fatigue Crack Propagation Location Detection[J]. Journal of Mechanical Engineering, 2024, 60(24): 25-34.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.2024.24.025

http://www.cjmenet.com.cn/EN/Y2024/V60/I24/25

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