Variance of elastic wave scattering from randomly rough surfaces

Shi, Fan

doi:10.1016/j.jmps.2021.104550

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…If inhomogeneities or uncertainties are concentrated at the interfaces in the form of a distribution of interfacial micro-cracks or an interface roughness, the irregularities are situated randomly in the vicinity of interfaces. To simulate the propagation of seismic waves through rough boundaries between the layers with different physical properties, Khachkova et al [ 31 ] constructed statistically equivalent models with rough interfaces and constant elastic moduli and models with random coefficients and flat interfaces, and Shi [ 32 ] derived theoretical formulae for predicting the variance of the scattering amplitude and intensity using Kirchhoff approximation for known statistical parameters of the roughness.…”

Section: Introductionmentioning

confidence: 99%

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Golub

Doroshenko

2023

Materials

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Cohesive and adhesive bindings degrade during operation and maintenance even if contacting materials in a manufactured laminated structure are perfectly matched at the interfaces. Two modelling approaches for describing partially closed delaminations or imperfect contact zones, which often occurs at the interfaces, are examined and considered. To confirm the adequateness of the applicability of the effective spring boundary conditions for guided wave scattering by a finite length delamination, guided wave propagation through a damaged zone with a distribution of micro-cracks is compared with an equivalent cohesive zone model, where the spring stiffnesses for the effective boundary conditions are calculated using the properties of the considered crack distribution. Two kinds of local interfacial decohesion zones with an imperfect contact at the interfaces are considered: uniform partially closed delaminations and bridged cracks. The possibility of the employment of the effective spring boundary conditions to substitute a distribution of micro-cracks is analysed and discussed. Two algorithms of generation of a distribution of open micro-cracks providing characteristics equivalent to the effective boundary conditions are presented and examined. The influence of the characteristics of a delamination on wave characteristics (eigenfrequencies, eigenforms, transmission coefficient) is investigated for several kinds of partially closed delaminations.

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Section: Introductionmentioning

confidence: 99%

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Golub

Doroshenko

2023

Materials

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“…For a nonideal boundary, the boundary roughness breaks this translational symmetry, resulting in the phenomenon of attenuated specular reflectance where the amplitude of the specularly reflected wave is reduced as part of the reflected wave is scattered in the non-specular directions. 12 In condensed matter physics, the phenomenon of boundary roughness scattering plays an important role in the reduced lattice thermal conductivity and thermoelectric properties of low-dimensional semiconductors (e.g. silicon nanowires and nanofilms).…”

Section: Introductionmentioning

confidence: 99%

Specular transmission and diffuse reflection in phonon scattering at grain boundary

Ong¹

2021

EPL

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It is widely assumed in the literature that the specularity parameters for phonon transmission (forward scattering) and reflection (backward scattering) at a boundary are identical, i.e., the statistical distributions of the transition probabilities between an incident phonon and the range of outgoing phonon modes are the same for both transmission and reflection. However, it is hypothesized by Li and McGaughey that separate specularity parameters are needed to describe the behavior of transmitted and reflected phonons in superlattices and polycrystalline materials correctly. We test this hypothesis by analyzing the mode-resolved specularity parameters computed separately for transmission and reflection processes at a graphene grain boundary. Our results show that backward scattering is considerably more diffuse than forward scattering at most frequencies and polarizations, providing strong evidence for Li and McGaughey's hypothesis, and shed new light on how surfaces and interfaces modify phonon transport within and between domains in nanostructured materials.

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Echo scattering characteristics: Vortex beams reflected by rough surface in ocean turbulence

Wu,

Zhang,

Lei

et al. 2024

Results in Physics

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Variance of elastic wave scattering from randomly rough surfaces

Cited by 6 publications

References 23 publications

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Effective Boundary Conditions and Stochastic Crack Distribution for Modelling Guided Waves Scattering by a Partially Closed Interfacial Delamination in a Laminate

Specular transmission and diffuse reflection in phonon scattering at grain boundary

Echo scattering characteristics: Vortex beams reflected by rough surface in ocean turbulence

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