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Your search keyword '"Berthelot, Yves"' showing total 4 results
Start Over Author "Berthelot, Yves" Topic lamb waves
4 results on '"Berthelot, Yves"'

2. Microstructure Effects of Ultrasonic Waves in a Fiber Reinforced Composite Plate

Author

Berthelot Yves, Han Jun-Bo, Tang Li-Guo, and Cheng Jian-Chun

Subjects
Materials science, Scattering, Acoustics, General Physics and Astronomy, chemistry.chemical_element, Microstructure, Lamb waves, chemistry, Composite plate, Energy transformation, Wigner distribution function, Ultrasonic sensor, Physics::Atomic Physics, Titanium
Abstract

The microstructure effect of ultrasonic waves in a unidirectional titanium graphite composite is analyzed by the mode energy conversions of the laser-generated ultrasonic Lamb waves. The carrying energy of each mode in the Lamb waves is calculated quantitatively by the time-frequency filtering technique of the Wigner distribution. We found that the energy conversions among modes have happened in the process of propagation of ultrasonic Lamb wave. These energy conversions are attributed to microstructure scattering of ultrasonic wave by the fibers in a fiber reinforced composite material. This work will provide a quantitative method of ultrasonic characterization of microstructure feature of the composite materials by the laser-generated Lamb wave technique.

Published
2000

3. Inversion of elastic constants for orthotropic plates from laser-based Lamb wave.

Author

Yang, Jing, Cheng, Jianchun, and Berthelot, Yves

Subjects
INVERSION (Geophysics), WAVELETS (Mathematics), ARTIFICIAL neural networks, LAMB waves
Abstract

An inverse method based on the wavelet transform (WT) and artificial neural networks (ANN) is presented to recover the elastic constants of an orthotropic plate from laser-based ultrasonic Lamb waves. The transient waveforms obtained by numerical simulations under different elastic constants are used as input of the ANN for training and learning. The WT is used for extracting the eigen-vectors from the raw Lamb wave signals to simplify the structure of the ANN. [ABSTRACT FROM AUTHOR]

Published
2002

4. Microstructure effects on laser-generated Lamb waves in a composite plate.

Author

Han, Jun-bo, Cheng, Jian-chun, Tang, Li-guo, and Berthelot, Yves

Subjects
MICROSTRUCTURE, LAMB waves
Abstract

An effective method for analyzing quantitatively mode distribution of laser-generated Lamb waveforms in a fiber reinforced composite plate is presented by using the Wigner distribution (WD). The carrying energy of each mode in the waveforms is calculated quantitatively by employing time-frequency filtering technique of the WD. We found that energy conversions among modes have happened in the process of propagation of Lamb waves. These energy conversions are attributed to microstructure scattering of ultrasonic wave by the fibers in fiber reinforced composite material. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001

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