Abstract
To explore the dynamic fracturing behaviors and energy dissipation characteristic during the dynamic tension failure of anisotropic rock materials, transversely isotropic shale with four bedding plane angles were investigated through Brazilian disc (BD) tests under different loading rates with a split Hopkinson pressure bar. The fracturing process was identified with high-speed photography at a frame rate of 200,000 fps. The velocity field of the shale was obtained by high-speed digital image correlation (DIC) technology. The energy dissipation used in crack evolution was calculated by subtracting the fragment kinetic energy from the absorbed energy. Results showed that the fracturing pattern for anisotropic rock under indirect tension was rate-dependent. As the loading rate increased, the failure mode exhibited a transformation from matrix tension to bedding shear and back to matrix tension again for 30º cases. As the loading rate further went higher, the anisotropic effect on the cracking path became less effective. For shales with the same failure modes in the dynamic BD test, both nominal Brazilian tensile strength and fracturing energy for anisotropic shale shared a similar trend regardless of loading angle.
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