Journal ArticleDOI
Ray based model for the ultrasonic time-of-flight diffraction simulation of thin walled structure inspection
TLDR
In this article, the authors discuss the successful application of ray techniques to simulate the ultrasonic time-of-flight diffraction experiments for plate-like structures and compare the simulated results with laboratory scale experimental results.Abstract:
It is necessary to size the cracklike defects accurately in order to extend the life of thin-walled (<10 mm) components (such as pressure vessels) particularly for aerospace applications. This paper discusses the successful application of ray techniques to simulate the ultrasonic time-of-flight diffraction experiments for platelike structures. For the simulation, the diffraction coefficients are computed using the geometric diffraction theory. The A and B scans are simulated in near real time and the different experimental parameters can be interactively controlled due to the computational efficiency of the ray technique. The simulated results are applied to (1) defect signal identification for vertical defects, (2) inspection of inclined defects, and (3) study the effect of pulse width or probe frequency on experimental results. The simulated results are compared with laboratory scale experimental results.read more
Citations
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Journal ArticleDOI
Shear-wave time of flight diffraction (S-TOFD) technique
TL;DR: In this paper, the authors used the shear wave-diffracted signal instead of the longitudinal wave for near-surface inspection of a crack tip and demonstrated an increase in the defect sizing accuracy.
Journal ArticleDOI
Reliability assessment of manual ultrasonic time of flight diffraction (TOFD) inspection for complex geometry components
TL;DR: In this article, a manual ultrasonic time of flight diffraction (TOFD) inspection system was used to develop the probability of detection (POD) and probability of sizing (POS) curves for the detection and sizing of surface-breaking cracks in components having complex geometry.
Journal ArticleDOI
A system model for ultrasonic NDT based on the Physical Theory of Diffraction (PTD).
TL;DR: A PTD-based system model is proposed for simulating the ultrasonic response of crack-like defects and it is also extended to provide good description of regions surrounding critical rays where the shear diffracted waves and head waves interfere.
Journal ArticleDOI
Detection and Localization of Delaminations in Thin Carbon Fiber Reinforced Composites with the Ultrasonic Polar Scan
Mathias Kersemans,Arvid Martens,Koen Van Den Abeele,Joris Degrieck,Filip Zastavnik,Lincy Pyl,Hugo Sol,Wim Van Paepegem +7 more
TL;DR: In this paper, the hybrid compliance-stiffness matrix method for simulating wave propagation in (delaminated) multilayered media with viscoelastic anisotropy has been confronted with high-quality amplitude and phase experiments on delaminated composites, obtained using the ultrasonic polar scan setup (UPS) in transmission by considering harmonic and pulsed ultrasound.
Journal ArticleDOI
Simulation of the TOFD technique using the finite element method
TL;DR: In this article, the application of the finite element technique to simulate the ultrasonic time-of-flight diffraction (TOFD) technique was discussed, where diffracted and reflected signals in TOFD techniques for vertical and inclined defects were simulated using plane strain elements.
References
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Journal ArticleDOI
Diffraction of elastic waves by cracks: application to time-of-flight inspection
J.A. Ogilvy,J.A.G. Temple +1 more
TL;DR: In this article, the angular variation of diffracted signal amplitude when infinite plane P or SV waves are incident on a semi-infinite crack is derived for the case of a defect symmetrically placed with respect to transmitter and receiver.
Journal ArticleDOI
The transfer of ultrasonic energy in the diffraction technique for crack sizing
TL;DR: In this article, the authors consider the mechanisms by which two of the ultrasonic pulses of importance in the diffraction technique are produced and compare the current theoretical situation with experimental measurements taken during the period of this work.
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Diffraction of elastic waves by cracks: application to time-of-flight inspection
J.A. Ogilvy,J.A.G. Temple +1 more