ACOUSTIC
EMISSION & NDT SCIENTIFIC PUBLICATIONS
Detection of
delaminations in non-metallic materials using guided
acousto-ultrasonics
5th National Conference on NDT of the Hellenic Society of NDT (HSNT),
18-19 November 2005, National Technical University of Athens.
Konstantinos Bollas, Dimitrios
Kouroussis, George Chryssos, Athanasios Anastasopoulos
The paper
reports the application of non-destructive testing techniques for
the quality control of wooden or limestone structures. Wooden and
limestone samples with one or two layers, containing artificial
imperfections (delaminations), were tested using Ultrasonics,
Sondicator and Acousto-ultrasonics. In order to improve the
resolution and the sensitivity of delamination detection, the method
of acousto-ultrasonics was modified using special designed
waveguides and excitation using arbitrary waveform generation. The
present work summarizes the basic principles of this new method,
named Guided Acousto Ultrasonics (GAU), its application and
procedure for delamination detection. In addition to that, the
present work describes, the other NDT methods used and the
respective inspection results. Finally comparison is made between
the different NDT methods used and discussion is held on the
possibility of delamination mapping in wood or limestone for depths
up to 0.5cm.
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