Frequency-dependent acoustic energy focusing in hexagonal ceramic micro-scaffolds |
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Affiliation: | 1. College of Chemistry, Jilin University, Changchun 130012, China;2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China;1. Cangzhou Central Hospital, Cangzhou 061000, Hebei Province, China;2. Cangzhou Hospital of Integrated Traditional and Western Medicine of Hebei Province, Cangzhou 061000, Hebei Province, China;3. Hebei Province Hospital of TCM, Cangzhou 061000, Hebei Province, China;4. Xingtai County Central Hospital, Cangzhou 061000, Hebei Province, China |
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Abstract: | Acoustic properties of an additive-manufactured SiC scaffold with hexagonal symmetry fabricated by the robocasting method are studied both numerically and experimentally. The numerical analysis is based on the finite element method (FEM) using Bloch boundary conditions. The calculations show both angular and frequency dispersion of the acoustic waves with wavelengths comparable to the spacing between the rods, i.e., on a millimeter scale, indicating interesting acoustic properties in the MHz range. The dispersion character leads to focusing of the energy propagation into the directions of the rods of the hexagonal structure. This is illustrated by modal-based calculations of the propagation of longitudinal and out-of-plane shear wave packets with a dominant wavelength. The experimental analysis consists of two steps, the measurement of the resonant spectrum and shear wave propagation character. The measured resonant spectrum is in good agreement with the one calculated using numerically obtained low-frequency properties of the structure, also showing the quality of the overall manufactured structure. The time-domain measurement shows significant changes in the energy propagation between low and high frequencies, as predicted by FEM calculations. |
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Keywords: | Robocast scaffold Phononic crystal Acoustic energy focusing Bloch analysis |
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