The influence of slip boundary effect on the propagation of shear horizontal guided waves in a fluid-saturated porous medium

Dai, Zhengchen; Liu, Jinxia; Geng, Haoran; Cui, Zhiwen; Kundu, Tribikram

doi:10.1007/s10665-023-10318-y

J Eng Math

2024

DOI: 10.1007/s10665-023-10318-y

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The influence of slip boundary effect on the propagation of shear horizontal guided waves in a fluid-saturated porous medium

Zhengchen Dai,

Jinxia Liu,

Haoran Geng

et al.

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2024

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The Peculiarities of Acoustic Normal Waves Propagation in Thin Porous Sheets of Thermally Expanded Graphite

Muravieva,

Blinova,

Denisov

et al. 2024

Prib. metody izmer.

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Thermally expanded graphite belongs to a new class of graphite materials with unique physical, chemical and mechanical properties. Acoustic wave velocity is one of the most important characteristics for study of porous materials including thin porous sheets of thermally expanded graphite. In this paper peculiarities of symmetric mode S0 Lamb wave propagation and SH-wave with horizontal polarization in sheets of thermally expanded graphite are experimentally investigated. To determine their velocities a differential measurement scheme on the base of a low-frequency acoustic flaw detector DIO1000 LF and specialized piezoelectric transducers with dry point contact was used. Additionally the longitudinal wave velocity in direction of sheet thickness was determined using piezoelectric transducers based on polyvinylidene fluoride. Indicatrices of normal wave velocities in the rolling plane were plotted and it was shown that the maximum acoustic anisotropy is characteristic for the S0-mode. The velocity minimum corresponds to the longitudinal direction of the rolling plane in which the maximum elongation of gas pores was observed. Influence of thickness and density of thermally expanded graphite sheets on the velocities of normal waves was investigated and presence of the thickness range where the minimum velocity values were observed due to the maximum inhomogeneity of layers formed in the rolling process. Method for determination of dynamic elastic moduli of porous thermally expanded graphite sheets using experimentally measured velocities of normal waves was proposed. It was shown that in the longitudinal direction of the rolling plane the Poisson's ratio took negative values which allow to attribute the specified material to auxetics ones.

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The Peculiarities of Acoustic Normal Waves Propagation in Thin Porous Sheets of Thermally Expanded Graphite

Muravieva,

Blinova,

Denisov

et al. 2024

Prib. metody izmer.

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The influence of slip boundary effect on the propagation of shear horizontal guided waves in a fluid-saturated porous medium

Cited by 1 publication

References 47 publications

The Peculiarities of Acoustic Normal Waves Propagation in Thin Porous Sheets of Thermally Expanded Graphite

The Peculiarities of Acoustic Normal Waves Propagation in Thin Porous Sheets of Thermally Expanded Graphite

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