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Shear wave measurements for improved characterization of shock‐Induced phase transformations in Carrara marble
Author(s) -
Aidun John B.,
Gupta Y. M.
Publication year - 1989
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl016i002p00191
Subject(s) - shear (geology) , shear modulus , calcite , crystallite , shock wave , materials science , bulk modulus , hydrostatic pressure , hydrostatic equilibrium , phase transition , mineralogy , shock (circulatory) , longitudinal wave , geology , composite material , thermodynamics , optics , wave propagation , physics , metallurgy , medicine , quantum mechanics
Shear waves have been measured in shock‐induced, high‐pressure phases of Carrara marble (polycrystalline calcite). The shear modulus decrease associated with the calcite‐CaCO 3 (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 CaCO 3 (II)‐CaCO 3 (III) transition. Longitudinal wave speeds over the entire compression range examined are in reasonable agreement with previous shock wave and hydrostatic measurements in polycrystalline CaCO 3 . 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 CaCO 3 (III) may be complete during shock compression. The usefulness of shear wave measurements in studying shock‐induced phase transformations in solids is indicated.