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There is developed an algorithm to determine position of possible exfoliations of a
triple-periodic system of elastic inclusions from an elastic matrix of a metamaterial after its
production. For this aim there is used the irradiation of each side of a cubic specimen of the
metamaterial by short impulses with a tone filling with the ultrasonic longitudinal waves. The
algorithm implies the experimental and the theoretical study of the propagation of a
high-frequency wave through the periodic system of inclusions. The theoretical solution is
constructed by methods of the geometrical diffraction theory. Based on comparison of the
experimental data and the theoretical calculations there is evaluated the presence of exfoliations
and their position inside the metamaterial.
Keywords: metamaterials; elastic wave propagation; elastic medium with spherical inclusions; geometrical diffraction theory. |
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