期刊
NDT & E INTERNATIONAL
卷 79, 期 -, 页码 63-72出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2015.12.003
关键词
Non-destructive test; Quantitative evaluation; Nonlinear ultrasonic modulation; Bispectral analysis; Modulation factor
资金
- National Natural Science Foundation of China [51475013, 11272017, 11402008]
Nonlinear acoustic coefficients have a close relationship with structural cracks. A nonlinear ultrasonic modulation method for micro-crack quantitative evaluation is developed. The influence of phase threshold on the crack evaluation is discussed. Ultrasonic modulation using a unilateral incentive model is applied to the quantitative evaluation of micro-cracks for different specimens. The experimental results indicate that the method can be beneficially applied for micro-cracks detection. A proper phase threshold can improve the reliability of the method based on nonlinear ultrasonic modulation. The presented modulation factor can be used to quantitatively evaluate the structural cracks, and it is suitable for small-crack quantitative evaluation. (C) 2015 Elsevier Ltd. All rights reserved.
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