期刊
ULTRASONICS
卷 102, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultras.2020.106063
关键词
Guided wave; Base-line free; Mode conversion; Defect localization; Reciprocity principle
资金
- Foundation for Innovative Research Groups of the National Nature Science Foundation of China [11421091]
- Special Funds for Scientific and Technological Innovation Talents of Harbin [JJ20170379]
Guided wave (GW) plays an important role in nondestructive testing and structural health monitoring. In the general Lamb wave inspection, difference between the baselines and the measured signals are used for structural damage evaluation. However, the baselines are unavoidably influenced by operational and environmental conditions leads to an increased error during inspection. To deal with this issue, this paper presents a base-line free method based on the mode conversion and reciprocity principle of Lamb wave. Once the defect is asymmetrical with respect to the transducer pair (two identical piezoelectric transducers used as actuator and receiver respectively), the elastic wave path length of the converted mode will be different, resulting in failing of the reciprocity principle. By processing the signals received by the transducer pair and extracting the time parameters of the wave packets in mode conversion signals, the defect can be localized. Results from the signals generated by numerical simulation are presented to verify the feasibility of the method, and the effectiveness of the proposed baseline-free method is demonstrated with experimental results.
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