期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 22, 期 3, 页码 638-646出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2007.09.006
关键词
nonlinear ultrasonics; Lamb waves; laser interferometer; spectrogram
资金
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0952391] Funding Source: National Science Foundation
This paper reports on a method that uses nonlinear Lamb waves to detect material nonlinearity. Lamb waves are well suited for the interrogation of thin metallic layers which act as waveguides, giving Lamb waves great potential in nondestructive evaluation applications. However, measuring nonlinear Lamb waves and extracting the information necessary for nondestructive evaluation is complicated by the inherent dispersive and multi-mode nature of Lamb waves. This paper presents a procedure that overcomes these difficulties and develops a reliable and robust measurement methodology. By using hybrid wedge generation and laser interferometric detection in combination with signal processing in the time-frequency domain, it is possible to make relative measurements of material nonlinearity parameters, which are an indicator of plasticity-driven damage. (c) 2007 Elsevier Ltd. All rights reserved.
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