Title: Comparison of intrinsic and acquired nonlinear effects in photothermal detection of delaminations in composites
Authors: Kalogiannakis, Georgios ×
Van Hemelrijck, Danny
Glorieux, Christ #
Issue Date: 2006
Publisher: Butterworth-Heinemann
Series Title: NDT & E international vol:39 issue:3 pages:236-243
Abstract: Photothermal techniques are based on the harmonic detection of thermal waves at the surface of a material. Several factors may render the
thermal wave response nonlinear. Such are intrinsic characteristics as the strong dependence of the thermal properties on temperature and/or
acquired features as defects that may open and close (‘kiss bonding’) at the excitation frequency. Several theoretical and experimental studies
have been performed to estimate and evaluate the existence of such overtones in the response and the potential exploitation for
nondestructive testing. This work is focused on composite materials. Based on precedent experimental studies, this theoretical analysis shows
the comparison of the rival effects in the generation of overtones. A finite element model was developed to solve the ‘intrinsic source case’ in
comparison to an analytical approximative simulation for the case of overtones originating from the oscillation of a defect (delamination)
size. Both models are reduced to a single dimension.
ISSN: 0963-8695
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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