Abstract
Elastic anisotropy was observed experimentally in pyrolytic nanocarbon, which is characterized by optical methods as an isotropic material. It is shown by methods of acoustical microscopy that, when an ultrashort pulse of focused ultrasound passes through a plate of such a material, splitting of the probe pulse occurs, which is caused by the excitation of longitudinal and both modes of transversal elastic waves in the volume of the material. Measurements of the sound velocity showed that pyrolytic nanocarbon has orthotropy and layered distribution of bulk elastic characteristics. The results obtained show a high efficiency of microacoustic methods for detection of anisotropy in weakly anisotropic textured materials, whose anisotropy is difficult to characterize by other methods.
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