|
Abstract |
Evidence of the Low-Frequency Nonlinear
Acoustic Spectroscopy Technique for Characterization of a Layered Material with
Adhesive Bonding Defects
F.Severin, B.O'Neill, R.Maev
(Department of Physics, University of Windsor, Windsor, Canada)
e-mail:
oneillb@uwindsor.ca
This
paper outlines the results of experimental work using the low frequency (up to
1MHz) nonlinear acoustic spectroscopy technique for generation and propagating
of acoustical waves in a structure composed of two metal sheets bonded together
with an industrial adhesive. The low-frequency technique makes use of the
nonlinear spectral transformations caused by mechanical vibrations of various
adhesive samples. The conditions for generation of second and higher order
harmonics is analysed and compared in both the cases of well bonded and
defective regions of the samples. The variation of the nonlinear response as
generated by different types of adhesive defects and properties was under
investigation. The goal of this research is to demonstrate the advantages of
application of the low-frequency nonlinear acoustic spectroscopy methods in a
layered adhesive bonding material for the characterization and detection of
various defects in adhesively bonded structures.
Section
: 3