| Citation: | PENG Chaoyong, XU Songbai, DU Chuangzhou, et al. Ultrasonic phased array imaging on aviation aluminum block fatigue crack[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(12): 2398-2404. doi: 10.13700/j.bh.1001-5965.2021.0161(in Chinese)
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Surface breaking fatigue crack propagation can lead to structural failure. The phased array ultrasonic imaging technology is used to monitor fatigue cracks and can obtain the crack information required for structural integrity evaluation. For the purpose of evaluating the structural integrity of a structure, fatigue cracks are monitored using the phased array ultrasonic imaging technique, which may also collect the crack information needed. It can promptly provide safety warnings before structural failures. The three-point bending fatigue test method is used to grow fatigue crack on an aviation aluminum test block. Fatigue cracks of different lengths are obtained by gradually cutting the material awayfrom the crack mouth surface. Phased array ultrasonic full matrix capture (FMC) and total focusing method (TFM) are applied by using fatigue crack tip and mouth image information to monitor crack growth and measure crack length. The test influences on ultrasonic imaging of phased array ultrasonic probe positioning, fatigue crack opening/closing, crack surface roughness are also carried out. The results show that the ultrasonic probe can better image the crack when irradiated from the side of the crack, which can truly reflect the morphology of the crack front inside the material. When the fatigue crack length is more than 3 times the ultrasonic length, the image of the crack tip and crack mouth is totally separated, the phased array ultrasonic FMC/TFM imaging technology can effectively measure the crack length, and the measurement error is less than 0.2 mm. Compared with being opened, the fatigue crack closing effect can weaken the reflection of the ultrasonic image signal at the crack tip by 4.5 dB, and the length measurement value is 0.6 mm smaller.
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