Lamb mode reflections at the end of a plate loaded by a viscoelastic material

Wilkie-Chancellier, Nicolas; Martinez, L.; Serfaty, Sylvia; Griesmar, Pascal; Caplain, Emmanuel; Huerou, J.-Y. Le; Gindre, M.

doi:10.1016/j.ultras.2006.05.185

Cited by 8 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where Eqs. (14) and 15correspond to the static-reference and the dynamic-reference set-ups, respectively.ũ 3 ðx 0 ; f Þ is the temporal Fourier transform of u 3 ðx 0 ; tÞ. In the case that the wavetrain has a relatively broad bandwidth, f 0 is taken as its central acoustic frequency.…”

Section: A Measurement Of the Acoustic Displacement Fieldmentioning

confidence: 99%

“…Other authors have used the 2D FT method to characterize Lamb waves using different excitation and detection schemes. The aforementioned wedge method is reversible and can be employed both for the generation [10][11][12][13][14][15] and detection 15 of the waves. Other reversible methods were also used to acquire the experimental data, such as air-coupled transducers 16,17 and immersion transducers in a liquid-filled cell.…”

Section: Introductionmentioning

confidence: 99%

“…The small spot size of focused laser beams allows to explore high spatial frequency zones of the spectrum if a short sampling interval is selected. This can be done both when scanning the generation [20][21][22] or the detection systems, 12,14 so that with this technology Lamb wavetrains with frequencies up to approximately 10 MHz were characterized. 20,21,27 Once selected the frequency range, i.e., the Nyquist frequency, then the frequency resolution is determined by the number of signal samples.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of guided acoustic waves in an arbitrary direction with full-field instantaneous maps of the acoustic displacement

Deán-Ben

Trillo

Doval

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

The full-field optical measurement of guided acoustic waves presents important advantages derived from the capability to map the acoustic field in a two dimensional region, so that acoustic information over a large area can be retrieved with each measurement. In this work, we introduce an extension of the well-established two dimensional spatio-temporal Fourier transform method to calculate the frequency spectrum of guided acoustic waves. For this, we take advantage of the unique capability of a self-developed double-pulsed television holography system to acquire the acoustic displacement field in two spatial dimensions and time. Then, the spatio-temporal Fourier transform method is expanded to three dimensions according to the nature of the experimental data, so that the frequency spectrum of the waves propagating in an arbitrary direction can be calculated. The method is tested experimentally by generating narrowband Lamb waves in an aluminium plate with a piezoelectric transducer. The good agreement between the theoretical and experimental spectra in a broad zone anticipates the applicability of the method to characterize guided acoustic waves as a function of the propagation direction in materials or structures presenting anisotropic propagation behaviour.

show abstract

Section: A Measurement Of the Acoustic Displacement Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of guided acoustic waves in an arbitrary direction with full-field instantaneous maps of the acoustic displacement

Deán-Ben

Trillo

Doval

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Nevertheless, a few studies have analyzed these kinds of materials using ultrasonic methods, such as [6], who used longitudinal and shear ultrasonic wave velocities in order to calculate the values of the acoustic impedance, Poisson's ratio and elastic constants of epoxy resin/marble powder composites. Indeed, ultrasonic techniques [11] are commonly used in the nondestructive testing of materials because they can be employed both in laboratory and in situ conditions to determine and monitor physical and mechanical properties of materials such as wood [12,13], metals [14,15], polymer/composites [16][17][18] and rocks [19,20]. Several configurations and instrumentations have been developed for ultrasonic testing, such as contact transducers (bulk, shear and wedge), immersion techniques and laser vibrometry [11].…”

Section: Introductionmentioning

confidence: 99%

“…In the last case, scanning laser Doppler vibrometry is a widely adopted method to measure the out-of-plane vibrational displacements related to the 1D wave propagation of materials for detecting defects or estimating viscoelastic parameters [15]. Recent technological developments have led to performant 3D scanning laser Doppler vibrometers, which give access to both out-of-plane and in-plane vibrational velocity components, which combined with inverse problem approaches, allow for the identification of orthotropic elastic stiffness using 3D guided wavefield data [21].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Engineered Stones Used in Artwork Reproductions: Mechanical Characterization by Laser Vibrometry

et al. 2023

View full text Add to dashboard Cite

Many museums have been producing reproductions for several years to replace artworks weakened by outdoor exhibition. Among these, in order to imitate the original aesthetic, the French consortium Réunion des Musées Nationaux–Grand Palais has chosen to work from large-format marble sculpture molds to complex composite materials based on resins comprising mineral fillers. However, similar to the original works of art, these reproductions age and deteriorate due to constant outdoor exposure. For this reason, current research focuses on the preventive conservation and monitoring of the structural health of these reconstructed objects. The goal of this paper was to study the resin/mineral powder composite materials used to produce cultural heritage reproductions of sculptures. This work is oriented toward a comparison of the mechanical properties of composite materials used in the replacement of cultural heritage sculptures (for instance, in the Garden of the Palace of Versailles or the Rodin Museum). The objectives were to first characterize the physical and mechanical properties of these materials in order to identify the most suitable material for cultural heritage reproduction, and secondly, to propose a method with minimal contact that obtained equivalent information as analyses performed with conventional ultrasonic techniques. These nondestructive evaluation techniques could be used for laboratory and in situ analyses. Samples of different polymer/mineral powder filler compositions were analyzed by compressional, shear and surface waves, generated by a 1 MHz center frequency ultrasonic transducer. Firstly, the measurements made it possible to evaluate the velocities of the bulk acoustic waves and extract the Young’s modulus of each tested material. Secondly, in order to have minimal contact with the analyzed structure, a laser interferometry system was used to detect waves at the surface and follow their propagation. The results clearly showed the possibility of using this technique to extract mechanical characteristics of composite materials, allowing for selection of material for the reproduction of large-format statues. For different types of polymer resins, the ability of ultrasonic analysis to track the impact of rock powder (marble or slate) on the mechanical properties of these synthetic materials was clearly observed, proving that this technique holds promise for monitoring the structural health of large-format artwork.

show abstract

Design, Fabrication and Characterization of a Tactile Display Based on AlN Transducers

Bernard

Gorisse

Casset

et al. 2014

Procedia Engineering

View full text Add to dashboard Cite

Lamb mode reflections at the end of a plate loaded by a viscoelastic material

Cited by 8 publications

References 10 publications

Characterization of guided acoustic waves in an arbitrary direction with full-field instantaneous maps of the acoustic displacement

Characterization of guided acoustic waves in an arbitrary direction with full-field instantaneous maps of the acoustic displacement

Monitoring of Engineered Stones Used in Artwork Reproductions: Mechanical Characterization by Laser Vibrometry

Design, Fabrication and Characterization of a Tactile Display Based on AlN Transducers

Contact Info

Product

Resources

About