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A Numerical Simulation of Elastic Waves for Defect Detection in Composite Plates

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This study presents numerical simulations of elastic waves for detecting symmetrically or non-symmetrically aligned defects in a thin epoxy adhesive layer connecting two aluminum plates. For the numerical simulations, a two dimensional plane model is constructed, and an element size and time increment are properly selected to acquire stable explicit dynamic analyses, which are carried out through a general purpose finite element program. Three different defect scenarios are applied to the composite plate by controlling the size and deterioration of a part or whole of the epoxy layer. Two-point excitation method is applied for baseline-free defect detection by arranging two excitation points and one reception point at the upper part of the composite plate. From the elastic-wave propagation simulation, it is shown that two-point excitation method is also applicable to the composite plates not just because of identification but also quantification capability of the target defects. Unlike non-symmetrically aligned defects, it is found that, in the case of the symmetrically aligned defects, two-point excitation method requires a baseline, which is against its potential. However, because of lacking of symmetric defects in the nature, the method holds its potential in most cases.
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Document Type: Research Article

Publication date: 2012-07-01

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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