Journal ArticleDOI
New opportunities for NDE with air-coupled ultrasound
Igor Solodov,K. Pfleiderer,H. Gerhard,S. Predak,Gerhard Busse +4 more
- Vol. 39, Iss: 3, pp 176-183
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TLDR
In this article, a focused slanted transmission mode (FSTM) was proposed for NDE applications of air-coupled ultrasound, which combines the benefits of plate wave excitation with a high spatial resolution and enables to characterise local elastic properties of a material.Abstract:
The area of NDE-applications of air-coupled ultrasound is expanded substantially for a weakly focused acoustic wave incident obliquely on a plate-like sample at an angle of ‘resonance’ transmission. Such a focused slanted transmission mode (FSTM) combines the benefits of plate wave excitation with a high spatial resolution and enables to characterise local elastic properties of a material. It was shown that the in-plain elastic anisotropy could be obtained by measurement of the ‘resonance’ transmission angle of the FSTM-output signal as a function of the azimuth angle. A striking contrast enhancement was demonstrated for the FSTM-C-scan imaging of cracked defects and delaminations. Non-contact FSTM-measurements of local variations of flexural wave velocity were used to detect fine structural changes and damage induced in polymer and composite materials during tensile tests.read more
Citations
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Dissertation
Evaluation of stiffness and damage of laminar composites
TL;DR: Sisukokkuvõte and Sammendrag as mentioned in this paper have published peer-reviewed publications in international journals and presentations at international conferences, including SISKOKKVõTE and SAMMENDRAG.
Journal ArticleDOI
Non-destructive monitoring of delamination healing of a CFRP composite with a thermoplastic ionomer interlayer
Wouter Post,Mathias Kersemans,I. Solodov,K. Van Den Abeele,Santiago J. Garcia,S. van der Zwaag +5 more
TL;DR: In this article, a comparative study is performed on the monitoring of delamination healing in CFRP-ionomer sandwich composites by non-destructive techniques and destructive compression testing, and a quasi-linear relation is observed between the delaminated area measured with ultrasonic C-scan and the compressive failure strength in destructive testing.
Journal ArticleDOI
Noncontact Ultrasonic Nondestructive Techniques: State of the Art and Their Use in Civil Engineering
TL;DR: Ultrasonic noncontact methods of testing civil engineering materials in air, where both transmission of waves into materials and reception of signals are contactless, are reviewed, with particular attention to enhancement of the signal-to-noise ratio by using coded signals.
Journal ArticleDOI
Two-dimensional simulation of the single-sided air-coupled ultrasonic pitch-catch technique for non-destructive testing
Steven Delrue,Koen Van Den Abeele,Erik Blomme,Jurgen Deveugele,Pieter Lust,Olivier Bou Matar +5 more
TL;DR: Observations and simulations obtained from a single-sided air-coupled pitch-catch configuration, which will assist the development and optimization of online inspection techniques, are reported.
Journal ArticleDOI
Air-Coupled Ultrasound: A Novel Technique for Monitoring the Curing of Thermosetting Matrices
TL;DR: The good agreement between the air-coupled ultrasonic results and those obtained by the rheological analysis demonstrated the reliability of air-Coupled ultrasound in monitoring the changes of viscoelastic properties at gelation and vitrification.
References
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Journal ArticleDOI
Review / Sythèse Nonlinear acoustic applications for material characterization: A review
TL;DR: In this paper, the effects of nonlinearity, dissipation, dispersion, and diffraction on material characterization applications are reviewed and the general theoretical analysis of these effects is presented.
Journal ArticleDOI
Nonlinear acoustic applications for material characterization: A review
TL;DR: In this paper, the effects of nonlinearity, dissipation, dispersion, and diffraction on intense acoustic-wave propagation are analyzed for various levels of disruption, from asymmetry of lattice structure and dislocation in crystals to disbonds and cracks in engineering materials.
Journal ArticleDOI
Plate wave resonance — a contactless test method
TL;DR: In this article, a contactless plate wave excited in thin sheets (such as paper or cardboard) directly from air without touching the sample is described, which may prove to be useful in online testing of various other, non-woven materials like plastic sheets.