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Liv Rittmeier, Natalie Rauter, Andrey Mikhaylenko, Rolf Lammering and Michael Sinapius
Lamb waves occur in thin-walled structures in two wave modes?the symmetric and the antisymmetric mode. Their oscillation on the structures? surfaces is either in phase (symmetric) or shifted by a phase angle of ??
p
(antisymmetric). In this work, a meth...
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Kevin J. Parker
In the approaches to elastography, two mathematical operations have been frequently applied to improve the final estimate of shear wave speed and shear modulus of tissues. The vector curl operator can separate out the transverse component of a complicate...
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Rymantas Jonas Kazys, Justina Sestoke and Egidijus Zukauskas
The developed new method will enable us to perform contactless air-coupled NDT of composite structures possessing a complex geometry.
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Kanji Ono
This work determined the attenuation coefficients of Lamb waves of ten engineering materials and compared the results with calculated Lamb-wave attenuation coefficients, a?S and a?A. The Disperse program and a parametric method based on Disperse results ...
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Grigory Dolgikh, Stanislav Dolgikh and Vladimir Ovcharenko
The paper presents the results of processing recordings of abnormal signals, which originated during the eruption of Hunga Tonga-Hunga Ha?apai volcano, and were registered by a laser nanobarograph and two laser strainmeters; there were three meters of se...
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María Higuera, José M. Perales, María-Luisa Rapún and José M. Vega
A review of available results on non-destructive testing of physical systems, using the concept of topological sensitivity, is presented. This mathematical tool estimates the sensitivity of a set of measurements in some given sensors, distributed along t...
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Maciej Radzienski, Pawel Kudela, Wieslaw Ostachowicz, Patryk Bolimowski, Rafal Kozera and Anna Boczkowska
Evaluation of Self-Healing Efficiency in Composite Laminates
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Mohd Syafiq Faiz, Mahmoud Addouche, Ahmad Rifqi Md. Zain, Kim S. Siow, Amar Chaalane and Abdelkrim Khelif
With the aim of selecting particular frequencies of interest and rejecting others, the waveguiding and filtering properties of a two-dimensional phononic crystal slab are investigated in the context of a filtering application. To this end, we designed an...
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Rymantas Jonas Kazys, Liudas Mazeika and Justina Sestoke
Air-coupled ultrasonic guided A0 mode is already used for material characterization. By measuring the phase velocity of the A0 mode the elastic properties, such as the Young?s modulus, can be determined. The objective of this work was the development of ...
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M. Saqib Hameed, Zheng Li and Kaihong Zheng
A damage estimation method based on continuous wavelet transformation (CWT) of the normalized Lamb wave signals is proposed here. Lamb waves are actuated and sensed using piezoelectric (lead zirconate titanate, PZT) transducers arranged in the form of sq...
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