Title: Resonant ultrasonic imaging of defects for advanced non-linear and thermosonic applications

Authors: Igor Solodov

Addresses: Department of Non-Destructive Testing (IKT-ZfP), Institute of Polymer Technology, University of Stuttgart, Stuttgart 70569, Germany

Abstract: An efficient wave-defect interaction is the key to high non-linear and thermal responses of flaws to be applied in ultrasonic imaging for non-destructive material evaluation. To selectively enhance defect vibrations a concept of local defect resonance is developed and applied to ultrasonic activation of defects. The frequency match between the defect resonance frequency and the probing ultrasonic wave results in a substantial rise of the defect non-linear response and its local temperature. The non-linear applications of this concept demonstrated in this paper cover both the higher harmonic and frequency mixing modes. The defect resonance is shown to be accompanied by depletion of the excitation frequency vibration due to non-linear frequency conversion to higher harmonics. The local generation of higher frequency components provides a high thermal defect response in such acoustically non-linear thermosonic mode.

Keywords: local defect resonance; nonlinear NDE; nondestructive evaluation; ultrasonic thermography; ultrasonic imaging; defects; flaws; thermosonic applications; defect vibrations; nondestructive testing; NDT.

DOI: 10.1504/IJMMP.2014.066909

International Journal of Microstructure and Materials Properties, 2014 Vol.9 No.3/4/5, pp.261 - 273

Published online: 16 Jan 2015 *

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