Title: Detection of defect parameters using nonlinear air-coupled emission by ultrasonic guided waves at contact acoustic nonlinearities
Authors: Delrue, Steven ×
Van Den Abeele, Koen #
Issue Date: Aug-2015
Publisher: Butterworth Heinemann
Series Title: Ultrasonics vol:63 pages:147-154
Abstract: Interaction of ultrasonic guided waves with kissing bonds (closed delaminations and
incipient surface breaking cracks) gives rise to nonlinear features at the defect location. This causes
higher harmonic frequency ultrasonic radiation into the ambient air, often referred to as Nonlinear Air-
Coupled Emission (NACE), which may serve as a nonlinear tag to detect the defects. This paper
summarizes the results of a numerical implementation and simulation study of NACE. The developed
model combines a 3D time domain model for the nonlinear Lamb wave propagation in delaminated
samples with a spectral solution for the nonlinear air-coupled emission. A parametric study is
conducted to illustrate the potential of detecting defect location, size and shape by studying the NACE
acoustic radiation patterns in different orientation planes. The simulation results prove that there is a
good determination potential for the defect parameters, especially when the radiated frequency
matches one of the resonance frequencies of the delaminated layer, leading to a Local Defect
Resonance (LDR).
ISSN: 0041-624X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physics, Campus Kulak Kortrijk
Physics and Astronomy - miscellaneous
× corresponding author
# (joint) last author

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