Defects induced in materials are accompanied by a local decrease of stiffness in the damaged area, which manifests in their characteristic frequencies and a possibility of resonant activation by a driving acoustic wave. Such Local Defect Resonance (LDR) enables to reliably detect and visualize the defect as soon as the driving acoustic frequency is matched to damage characteristic frequency. This also provides a high frequency selectivity of the LDR-based imaging, i.e., an opportunity of detecting a certain defect among a multitude of other defects in material. In this article, the benefits of the resonant approach are demonstrated via multiple case studies for nonlinear, optical, and thermosonic frequency-selective imaging of defects in lightweight materials and components.
 J. Krautkrämer and H. Krautkrämer. Ultrasonic Testing of Materials, 4th ed., Springer-
Verlag, Berlin, New York (1990).
 I. Solodov, J. Bai, S. Bekgulyan, and G. Busse. Appl. Phys. Lett. 99:211911 (2011).
 I. Solodov, J. Bai, and G. Busse. J. Appl. Phys. 113:223512 (2013).
 S. Timoshenko. Vibration Problems in Engineering. 4th ed., D. Van Nostrand Company
 I. Solodov, N. Krohn, and G. Busse. Ultrasonics 40:621–625 (2002).
 I. Solodov. J. Nondestruct. Eval. 33:252–262 (2014).
 G. Busse, D. Wu, and W. Karpen. J. Appl. Phys. 71:3962–3965 (1992).
 P.Menner, H. Gerhard, and G. Busse. AIP Conference Proceedings 1211:2068–2072 (2010).
38 Page Views
0 PDF Downloads
0 Facebook Shares