Inhomogeneous wave generation and propagation in lossy anisotropic solids. Application to the characterization of viscoelastic composite materials

Hosten, Bernard; Deschamps, M.; Tittmann, B. R.

doi:10.1121/1.395170

Cited by 163 publications

(75 citation statements)

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“…Importance of inhomogeneous waves in single-phase viscoelastic media are found in Borcherdt (1977Borcherdt ( , 1982 and Cerveny and Psencik (2005a, b). Experimental results (Borcherdt et al, 1986;Hosten et al, 1987) confirm the generation and existence of inhomogeneous body waves and the differences in their physical characteristics from elastic body waves. Carcione (2006) studied the Rayleigh-window effect to explain the role of inhomogeneous waves in amplitude reduction of the reflection coefficient of the ocean bottom.…”

Section: Introductionmentioning

confidence: 58%

Intrinsic attenuation from inhomogeneous waves in a dissipative anisotropic poroelastic medium

Sharma

Vashishth

2011

Earth Planet Sp

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A procedure is suggested to translate the quality factor of a plane harmonic attenuating wave in a general anisotropic elastic medium into its phase velocity and two finite non-dimensional attenuation parameters. A chosen value of the quality factor of an attenuated wave in the dissipative medium is used to specify its complex slowness vector for a general direction of propagation. In this specification, one of the attenuation parameter identifies the component of intrinsic attenuation along the direction of propagation of wave, i.e., homogeneous propagation of wave. Another parameter represents the component of attenuation in the direction orthogonal to propagation direction. It measures the deviation from homogeneous propagation and is termed as the inhomogeneity strength of the attenuated wave. These attenuation parameters alongwith phase velocity are used to calculate the rate of decay of amplitude of the attenuated wave along any given direction in propagationattenuation plane. Biot's theory is used to study the propagation of four attenuating waves in an anisotropic poroviscoelastic medium in the presence of initial stress. For each wave, the specification of complex slowness vector is obtained in terms of its phase velocity and two attenuation parameters. Numerical results show that the attenuation contribution from the homogeneous propagation (of any of the three faster waves) is only a little in the total attenuation of any of these attenuated waves. The effects of the changes in anisotropy-type, initial-stress, frequency, fluid-viscosity, viscous characteristic length, and anelasticity of porous frame on the attenuation are also studied. It is found that though they affect the phenomenon of wave propagation and wave characteristics, major contribution to total intrinsic attenuation comes from the inhomogeneous propagation of the attenuated wave.

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Section: Introductionmentioning

confidence: 58%

Intrinsic attenuation from inhomogeneous waves in a dissipative anisotropic poroelastic medium

Sharma

Vashishth

2011

Earth Planet Sp

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“…Though, in designing composite components it is of crucial importance to have knowledge on the stiffness tensor in order to assure the component's functionality and to maintain its structural integrity. In the past, several non-destructive characterization techniques have been proposed and developed to obtain information about the elastic material properties on the basis of ultrasound [1][2][3][4][5][6], in which most characterization techniques simply employ bulk wave concepts. Typically, these techniques rely on the Time-of-Flight (TOF) of an ultrasound pulse, from which the wave velocity can be determined, which is on its turn related to the mechanical stiffness of the investigated medium [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the Time-of-Flight Pulsed Ultrasonic Polar Scan for the determination of the full elasticity tensor of orthotropic plates

Martens

Kersemans

Daemen

et al. 2017

Composite Structures

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A novel approach is presented for the ultrasonic determination of the elastic constants in plate-like structures of an orthotropic material (e.g. composites) using a time-of-flight version of the pulsed ultrasonic polar scan (TOF P-UPS). A forward numerical model of the TOF P-UPS is coupled to an inversion algorithm, based on the genetic optimization principle, targeting the determination of the orthotropic elastic parameters, and the quality of the inversion is demonstrated for synthetic data representative for composites. The advantage of the new approach is that the presented TOF P-UPS inversion method does not require a priori knowledge about the symmetry class of the material, nor about the orientation of the main axes of symmetry. Furthermore, the TOF P-UPS inversion method yields an accurate characterization of the orthotropic elasticity tensor, even when applied to composite plates with small frequency-thickness ratios in which the traditional bulk wave approaches no longer hold. Finally, the robustness of the TOF P-UPS inversion method is demonstrated for noisy data by evaluating the results for a range of signal-to-noise ratios.

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“…The use of TOF measurements has been succesfully applied for the determination of elastic properties assuming rather thick samples (ranging from 3 to 6 mm at frequencies of 2-5 MHz) in combination with a bulk wave approximation [3] [4]. In many cases, however, the actual thickness of plates is smaller and, as such, deviations from the bulk wave approximation are to be expected, as shown in figure 1 where a clear deviation from the bulk wave TOF solution is seen around the longitudinal and shear critical angles for an aluminum plate of 1.5 mm, examined at a frequency of 5 MHz.…”

Section: Introductionmentioning

confidence: 99%

Time-Of-Flight recorded Pulsed Ultrasonic Polar Scan for elasticity characterization of composites

Martens¹,

Kersemans²,

Degrieck³

et al. 2015

Emerging Technologies in Non-Destructive Testing VI

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In its orginal configuration, the pulsed ultasonic polarscan (P-UPS) mainly focussed on elastic material characterization through the inversion of amplitude landscape measurements. However, for several materials, special attention is required as minima in the transmission amplitudes do not exactly coincide with critical angles calculated from the Christoffel equations. Consequently, other means to extract the information on elastic moduli from P-UPS measurements are being investigated. In the present paper, we report on the use of time-of-flight ultrasonic polarscan (TOF-UPS) simulations as a new means of material characterization. Previous TOF inversions, although successful, were based on bulk wave approximations, which are not longer valid for thin materials. Our first inversion results on numerical cases demonstrate the usefulness of the new developed technique and highlight the added value compared to the bulk wave approximation 1 INTRODUCTION

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Inhomogeneous wave generation and propagation in lossy anisotropic solids. Application to the characterization of viscoelastic composite materials

Cited by 163 publications

References 0 publications

Intrinsic attenuation from inhomogeneous waves in a dissipative anisotropic poroelastic medium

Intrinsic attenuation from inhomogeneous waves in a dissipative anisotropic poroelastic medium

Numerical study of the Time-of-Flight Pulsed Ultrasonic Polar Scan for the determination of the full elasticity tensor of orthotropic plates

Time-Of-Flight recorded Pulsed Ultrasonic Polar Scan for elasticity characterization of composites

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