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- W2040064055 abstract "An experimental investigation was conducted to study wave processes in the interior of a large block of Bedford limestone modelling an isotropic half-space, and both in the interior and near the surface of two blocks of Colorado Yule marble representing a transversely isotropic half-space with the axis of elastic symmetry lying in planes parallel to the free surface. The blocks were loaded normal to the free surface by the transmission of pulses through an aluminum bar subjected on its distal end to central longitudinal impact of steel spheres projected from an air gun. The input pulse was monitored by an X-cut quartz crystal sandwiched between the rock surface and the loading bar, while the pulse propagation in the blocks was detected and recorded by specially designed embedded transducers. These consisted of PZT ceramic crystals mounted on the end of magnesium bars that were inserted into core-drilled holes and anchored with a mixture of aluminum oxide powder and epoxy. The normal stress components detected by these devices were compared with the predictions of a finite element method at stations near the impact point, and with those of an integral transform solution at more distant positions; satisfactory correspondence was found to exist in almost all instances. The body and surface wave measurements were also utilized to determine the five independent elastic constants of Yule marble required for the theoretical analyses. The values were determined by means of a least square approximation procedure and a minimization of an objective function derived from the phase velocity equation for a transversely isotropic material, subject to certain constraints. The results were found to be intermediate to two other sets of previously measured parameters for this material." @default.
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- W2040064055 date "1974-09-01" @default.
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- W2040064055 title "Measurements of wave processes in isotropic and transversely isotropic elastic rocks" @default.
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- W2040064055 doi "https://doi.org/10.1016/0148-9062(74)93100-3" @default.
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