scholarly journals Pore scale numerical modeling of elastic wave dispersion and attenuation in periodic systems of alternating solid and viscous fluid layers

2006 ◽  
Vol 120 (2) ◽  
pp. 642-648 ◽  
Author(s):  
Radim Ciz ◽  
Erik H. Saenger ◽  
Boris Gurevich
Keyword(s):  
Numerical Modeling ◽  
Viscous Fluid ◽  
Elastic Wave ◽  
Wave Dispersion ◽  
Periodic Systems ◽  
Pore Scale ◽  
Fluid Layers ◽  
Dispersion And Attenuation

Elastic wave dispersion and attenuation caused by multiple types of disc-shaped inclusions

2018 ◽  
Vol 9 (2) ◽  
pp. 219-232 ◽  
Author(s):  
Victor Mykhas’kiv ◽  
Yaroslav Kunets ◽  
Valeriy Matus ◽  
Oksana Khay
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Three Dimensional ◽  
Wave Dispersion ◽  
Attenuation Coefficients ◽  
Low Contrast ◽  
Content Type ◽  
Wave Velocities ◽  
Effective Wave ◽  
Dispersion And Attenuation

Purpose The purpose of this paper is to numerically investigate time-harmonic elastic wave propagation with the analysis of effective wave velocities and attenuation coefficients in a three-dimensional elastic composite consisting of infinite matrix and uniformly distributed soft, low-contrast and absolutely rigid disc-shaped micro-inclusions. Design/methodology/approach Within the assumptions of longitudinal mode of a propagating wave as well as dilute concentration and parallel orientation of inclusions in an infinite elastic matrix, Foldy’s dispersion relation is applied for introducing a complex and frequency-dependent wavenumber of homogenized structure. Then, the effective wave velocities and attenuation coefficients are directly defined from the real and imaginary parts of wavenumber, respectively. Included there a far-field forward scattering amplitude by a single low-contrast inclusion given in an analytical form, while for the other types of single scatterers it is determined from the numerical solution of boundary integral equations relative to the displacement jumps across the surfaces of soft inclusion and the stress jumps across the surfaces of rigid inclusion. Findings On the frequency dependencies, characteristic extremes of the effective wave velocities and attenuation coefficients are revealed and analyzed for different combinations of the filling ratios of involved types of inclusions. Anisotropic dynamic behavior of composite is demonstrated by the consideration of wave propagation in perpendicular and tangential directions relatively to the plane of inclusions. Specific frequencies are revealed for the first case of wave propagation, at which inclusion rigidities do not affect the effective wave parameters. Originality/value This paper develops a micromechanical study that provides a deeper understanding of the effect of thin-walled inclusions of diversified rigidities on elastic wave propagation in a three-dimensional composite. Described wave dispersion and attenuation regularities are important for the non-destructive testing of composite materials by ultrasonics.

scholarly journals Wave Dispersion and Attenuation on Human Femur Tissue

Sensors ◽  
2014 ◽  
Vol 14 (8) ◽  
pp. 15067-15083 ◽  
Author(s):  
Maria Strantza ◽  
Olivia Louis ◽  
Demosthenes Polyzos ◽  
Frans Boulpaep ◽  
Danny van Hemelrijck ◽  
...  
Keyword(s):  
Wave Dispersion ◽  
Human Femur ◽  
Dispersion And Attenuation
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