Shear wave measurements for improved characterization of shock-induced phase transformations in Carrara marble

Details Shear wave measurements for improved characterization of shock-induced phase transformations in Carrara marble Shear wave measurements for improved characterization of shock-induced phase transformations in Carrara marble

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..191a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Feb. 1989, p. 191-194.

Physics

3

Calcite, Phase Transformations, Rock Mechanics, S Waves, Shock Waves, Calcium Carbonates, Longitudinal Waves, Particle Motion, Shear Strain

Scientific paper

Shear waves have been measured in shock-induced, high-pressure phases of Carrara marble (polycrystalline calcite). The shear modulus decrease associated with the calcite-CaCO3(II) transition is comparable to that observed under hydrostatic loading. Beyond this transition, the shear modulus in the shocked marble increases with compression, even with the occurrence of the CaCO3(II)-CaCO3(III) transition. Longitudinal wave speeds over the entire compression range examined are in reasonable agreement with previous shock wave and hydrostatic measurements in polycrystalline CaCO3. A preliminary determination of the bulk modulus from the shear and longitudinal wave speeds in the shocked marble is in reasonable agreement with hydrostatic measurements on polycrystalline and single crystal calcite, suggesting that the transformation to CaCO3(III) may be complete during shock compression. The usefulness of shear wave measurements in studying shock-induced phase transformations in solids is indicated.

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