Journal
NDT & E INTERNATIONAL
Volume 73, Issue -, Pages 8-14Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2015.03.002
Keywords
Noncontact nonlinear wave modulation; Fatigue crack detection; Damage visualization; Air-coupled transducer; 3D Laser Doppler vibrometer
Funding
- Smart Civil Infrastructure Research Program - Ministry of Land, Infrastructure and Transport (MOLIT) of Korea government [13SCIPA01]
- Korea Agency for Infrastructure Technology Advancement (KAIA)
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This paper presents a complete noncontact fatigue crack visualization technique based on nonlinear ultrasonic wave modulation and investigates the main source of nonlinear modulation generation. Two distinctive frequency input signals are created by two air-coupled transducers and the corresponding ultrasonic responses are scanned using a 3D laser Doppler vibrometer. The effectiveness of the proposed technique is tested using aluminum plates with different stages of fatigue crack formation such as micro and macro-cracks. Furthermore, the main source of nonlinear modulation is discussed based on the visualization results and the microscopic images. (C) 2015 Elsevier Ltd. All rights reserved.
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