To address these problems a 3D elastodynamic model for simulation of ultrasonic crack detection in anisotropic materials has been developed. The model handles a transmitter/ receiver (possibly separated) generating an ultrasonic field. Quasi P-, SV- and SH-wave fields may be generated at arbitrary angle. The field interacts with a strip-like crack in a specimen of homogeneous anisotropy. The crack may be internal, near surface or surface breaking. The probe signal response is calculated by Auld's electromechanical reciprocity relation. The signal includes crack surface reflection and tip diffraction.
The benefit of such a model is that better understanding of the wave propagation process may be gained. Also, it is possible to make controlled parameter studies in order to understand the influence of e.g. defect orientation, probe angle and frequency on the test results. Numerical examples are presented for an isotropic and a transversely isotropic solid. The results are presented as A-, B- or C-scans.
Reference:
1.Mattsson, J., Niklasson, A. J. and Eriksson, A., 3D Ultrasonic crack detection in anisotropic materials, Res. Nondestr. Eval., to appear.
Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00
Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:
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