Abstract
Summary We constructed set of crack samples using solid matrix material filled with thin penny-shaped inclusions, with crack density from 0% to 12%. The velocity of the shear wave parallel and perpendicular to the cracks were measured with the three sets ultrasonic transducers with different main frequencies, the relation between fast and slow shear wave velocity and crack density were obtained at different frequencies. The results show that the velocity of the fast shear wave parallel to the cracks decreases slightly with an increase of crack density in all the three frequency measurements, whereas the slow shear wave velocity decreases more rapidly with increasing crack density, and that the shear-wave anisotropy increases with increasing crack density. The shear wave velocities and anisotropy change with frequency which is related to the scattering caused by the cracks. This phenomenon is more apparently at high crack density.
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