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Frequency, pressure, and strain dependence of nonlinear elasticity in Berea Sandstone

Rivière, Jacques ; Pimienta, Lucas ; Scuderi, Marco ; Candela, Thibault ; Shokouhi, Parisa ; Fortin, Jérôme ; Schubnel, Alexandre ; Marone, Chris ; Johnson, Paul A.

Geophysical research letters, 2016-04, Vol.43 (7), p.3226-3236 [Periódico revisado por pares]

Washington: John Wiley & Sons, Inc

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Título:
Frequency, pressure, and strain dependence of nonlinear elasticity in Berea Sandstone
Autor: Rivière, Jacques ; Pimienta, Lucas ; Scuderi, Marco ; Candela, Thibault ; Shokouhi, Parisa ; Fortin, Jérôme ; Schubnel, Alexandre ; Marone, Chris ; Johnson, Paul A.
Assuntos: Acoustoelasticity ; Acousto‐Elasticity ; Berea Sandstone ; Dependence ; earth sciences ; Elasticity ; Frequency Dependence ; GEOSCIENCES ; Harmonics ; material science ; Microstructure ; Nonlinear Acoustics ; Nonlinear Elasticity ; nonlinear elasticity in sandstone ; Nonlinearity ; Rocks ; Sandstone ; Strain ; Ultrasonic Testing
É parte de: Geophysical research letters, 2016-04, Vol.43 (7), p.3226-3236
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
LA-UR-16-22600
AC52-06NA25396
USDOE Office of Science (SC)
Descrição: Acoustoelasticity measurements in a sample of room dry Berea sandstone are conducted at various loading frequencies to explore the transition between the quasi‐static ( f→0) and dynamic (few kilohertz) nonlinear elastic response. We carry out these measurements at multiple confining pressures and perform a multivariate regression analysis to quantify the dependence of the harmonic content on strain amplitude, frequency, and pressure. The modulus softening (equivalent to the harmonic at 0f) increases by a factor 2–3 over 3 orders of magnitude increase in frequency. Harmonics at 2f, 4f, and 6f exhibit similar behaviors. In contrast, the harmonic at 1f appears frequency independent. This result corroborates previous studies showing that the nonlinear elasticity of rocks can be described with a minimum of two physical mechanisms. This study provides quantitative data that describes the rate dependency of nonlinear elasticity. These findings can be used to improve theories relating the macroscopic elastic response to microstructural features. Key Points We study the frequency dependence of nonlinear elasticity in Berea sandstone We find different frequency dependence behavior among the harmonic content These findings will ultimately help in better relating the nonlinear elastic behavior to rock microstructure
Editor: Washington: John Wiley & Sons, Inc
Idioma: Inglês

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Frequency, pressure, and strain dependence of nonlinear elasticity in Berea Sandstone

Rivière, Jacques ; Pimienta, Lucas ; Scuderi, Marco ; Candela, Thibault ; Shokouhi, Parisa ; Fortin, Jérôme ; Schubnel, Alexandre ; Marone, Chris ; Johnson, Paul A.

Washington: John Wiley & Sons, Inc

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