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