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Article Dans Une Revue Review of Scientific Instruments Année : 2021

A new high-pressure technique for the measurement of low frequency seismic attenuation using cyclic torsional loading

Résumé

We report a new technique for torsional testing of materials under giga-pascal pressures, which uses a shearing module in a large volume Paris-Edinburgh press in combination with highresolution fast radiographic X-ray imaging. The measurement of the relative amplitude and phase lag between the cyclic displacement in the sample and a standard material (Al2O3) provides the effective shear modulus and attenuation factor for the sample. The system can operate in the 0.001 to 0.01 Hz frequency range, and up to 5 GPa and 2000 K; although hightemperature measurements may be affected by grain growth and plastic strain. Preliminary experimental results on San Carlos olivine are in quantitative agreement with previously reported Q-1 factors at lower pressure. This cyclic torsional loading method opens new directions to quantify the viscoelastic properties of minerals/rocks at seismic frequencies and in pressure-temperature conditions relevant to the Earth's mantle, for a better interpretation of seismological data.
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Dates et versions

hal-03411885 , version 1 (02-11-2021)

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Jean-Philippe Perrillat, Roman Bonjan, Yann Le Godec, Frédéric Bergame, Julien Philippe, et al.. A new high-pressure technique for the measurement of low frequency seismic attenuation using cyclic torsional loading. Review of Scientific Instruments, 2021, 92 (9), pp.093906. ⟨10.1063/5.0055549⟩. ⟨hal-03411885⟩
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