Non-Destructive Evaluation of Kissing Bonds using Local Defect Resonance (LDR) Spectroscopy: A Simulation Study

With the growing demand from industry to optimize and further develop existing Non-Destructive Testing & Evalu- ation (NDT&E) techniques or new methods to detect and characterize incipient damage with high sensitivity and increased quality, a lot of research has been performed to better understand the typical behavior of kissing bonds, such as delaminations and cracks. Recently, it has been shown experimentally that the nonlinear ultrasonic re- sponse of kissing bonds could be enhanced by using Local Defect Resonance (LDR) spectroscopy. LDR spectroscopy is an efficient NDT technique that takes advantage of the characteristic frequencies of the defect (defect resonances) in order to provide maximum acoustic wave-defect inter- action. In fact, for nonlinear methodologies, the ultrasonic excitation of the sample should occur at either multiples or integer ratios of the characteristic defect resonance fre- quencies, in order to obtain the highest signal-to-noise re- sponse in the nonlinear LDR spectroscopy. In this study, the potential of using LDR spectroscopy for the detection, localization and characterization of kissing bonds is illustrated using a 3D simulation code for elas- tic wave propagation in materials containing closed but dynamically active cracks or delaminations. The model allows to reveal the presence of local defect resonances, to establish the link between several types of defects and their characteristic resonances and to assist in the further design and testing of LDR spectroscopy.

Jaar van publicatie:2015

BOF-keylabel:ja

IOF-keylabel:ja

Authors from:Higher Education