Propagation of Elastic Waves in Solids

Nazarchuk, Z. T.; Skal’s’kyi, V. R.; Serhiyenko, Oleh

doi:10.1007/978-3-319-49350-3_2

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…These events are argued on the basis of the influence of the geometry and boundary conditions of non-free surfaces on the launched elastic waves. Hence, despite containers being built from the same material, the mechanical behavior of these surfaces are subjected to distinct normal and tangent translational and rotational constraints [ 56 , 57 ].…”

Section: Resultsmentioning

confidence: 99%

Remotely Exploring Deeper-Into-Matter by Non-Contact Detection of Audible Transients Excited by Laser Radiation

Moros

Gaona

Laserna

2017

Sensors

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An acoustic spectroscopic approach to detect contents within different packaging, with substantially wider applicability than other currently available subsurface spectroscopies, is presented. A frequency-doubled Nd:YAG (neodymium-doped yttrium aluminum garnet) pulsed laser (13 ns pulse length) operated at 1 Hz was used to generate the sound field of a two-component system at a distance of 50 cm. The acoustic emission was captured using a unidirectional microphone and analyzed in the frequency domain. The focused laser pulse hitting the system, with intensity above that necessary to ablate the irradiated surface, transferred an impulsive force which led the structure to vibrate. Acoustic airborne transients were directly radiated by the vibrating elastic structure of the outer component that excited the surrounding air in contact with. However, under boundary conditions, sound field is modulated by the inner component that modified the dynamical integrity of the system. Thus, the resulting frequency spectra are useful indicators of the concealed content that influences the contributions originating from the wall of the container. High-quality acoustic spectra could be recorded from a gas (air), liquid (water), and solid (sand) placed inside opaque chemical-resistant polypropylene and stainless steel sample containers. Discussion about effects of laser excitation energy and sampling position on the acoustic emission events is reported. Acoustic spectroscopy may complement the other subsurface alternative spectroscopies, severely limited by their inherent optical requirements for numerous detection scenarios.

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Section: Resultsmentioning

confidence: 99%

Remotely Exploring Deeper-Into-Matter by Non-Contact Detection of Audible Transients Excited by Laser Radiation

Moros

Gaona

Laserna

2017

Sensors

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“…• Shear waves: Also known as transverse waves, the direction of vibrations in these waves is normal to the direction of wave propagation [26]. Note that the direction of particle vibration is referred to as the polarization.…”

Section: Ultrasonic Pulse Velocity (Upv) Testingmentioning

confidence: 99%

Dynamic elastic properties of brick masonry constituents

Makoond

Pelà

Molins

2019

Construction and Building Materials

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When subjected to dynamic loading, materials can exhibit a mechanical behaviour quite different from its static counterpart. The evaluation of dynamic properties is thus very useful in the assessment of existing masonry structures. This paper presents results of an experimental campaign to determine both the dynamic Young's modulus and the shear modulus of brick masonry constituents through two non-destructive testing methods. Following a discussion on the reliability of the methods, a robust procedure is described and tested on a variety of samples. The results show that the techniques can be successfully applied to provide reliable estimates of the dynamic elastic properties of brick masonry constituents.

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“…In practical applications, the multi-modal and dispersive character of elastic waves, propagating in a structure upon AE event generation, induces substantial difficulties in reliable assessment of structural state. These complex properties of the wavefield originate from the existence of material boundaries, discontinuities, variation in material properties and thickness [6,7]. In particular, wave dispersion consists in different velocity of waves depending on their frequency, resulting in waveform distortion along the propagation path [8,9].…”

Section: Introductionmentioning

confidence: 99%

Prospects on application of elastic metamaterials in acoustic emission sensing

Klimek¹,

Paćko²

2023

eJNDT

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This paper discusses challenges, limitations and problems arising in currently employed acoustic emission testing systems, sensors and signal processing algorithms. Main factors influencing and compromising accuracy and reliability of the classically used methods are briefly analyzed. Next, metamaterials and their dynamic properties are outlined with the aim and focus on their potential in manipulating energy flow. Several applications of metamaterials in acoustic emission are presented that indicate their potential in acoustic emission. Finally, possibilities of designing a new type of sensor for acoustic emission using metamaterials is discussed. As a consequence, it is expected to increase sensitivity and accuracy of source localization with smaller number of sensors used during measurements.

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Propagation of Elastic Waves in Solids

Cited by 15 publications

References 30 publications

Remotely Exploring Deeper-Into-Matter by Non-Contact Detection of Audible Transients Excited by Laser Radiation

Remotely Exploring Deeper-Into-Matter by Non-Contact Detection of Audible Transients Excited by Laser Radiation

Dynamic elastic properties of brick masonry constituents

Prospects on application of elastic metamaterials in acoustic emission sensing

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