期刊
ULTRASONICS
卷 88, 期 -, 页码 157-167出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultras.2018.03.008
关键词
Breathing crack; Contact acoustic nonlinearity; Guided ultrasonic waves; Analytical model; Crack evaluation
资金
- National Natural Science Foundation of China [51635008]
- Hong Kong Research Grants Council via General Research Fund [15214414, 15201416]
To characterize fatigue cracks, in the undersized stage in particular, preferably in a quantitative and precise manner, a two-dimensional (2D) analytical model is developed for interpreting the modulation mechanism of a breathing crack on guided ultrasonic waves (GUWs). In conjunction with a modal decomposition method and a variational principle-based algorithm, the model is capable of analytically depicting the propagating and evanescent waves induced owing to the interaction of probing GUWs with a breathing crack, and further extracting linear and nonlinear wave features (e.g., reflection, transmission, mode conversion and contact acoustic nonlinearity (CAN)). With the model, a quantitative correlation between CAN embodied in acquired GUWs and crack parameters (e.g., location and severity) is obtained, whereby a set of damage indices is proposed via which the severity of the crack can be evaluated quantitatively. The evaluation, in principle, does not entail a benchmarking process against baseline signals. As validation, the results obtained from the analytical model are compared with those from finite element simulation, showing good consistency. This has demonstrated accuracy of the developed analytical model in interpreting contact crack-induced CAN, and spotlighted its application to quantitative evaluation of fatigue damage. (C) 2018 Elsevier B.V. All rights reserved.
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