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TitleModeling of high-frequency wave propagation in structured materials
Publication TypeJournal Article
Year of Publication2011
AuthorsYoung, R., Harris P.D., and Dawson A.
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Pagination547 - 566
Date Published2011
ISSN08853010 (ISSN)
KeywordsA-plane, Acoustic impedance, aluminum, Analytical model, computer simulation, Fast mode, Fundamental modes, High frequency waves, Impedance properties, Manufacturing Process, MATHEMATICAL MODELS, Microstructure, Models, Plate surfaces, Pore spacing, Porous aluminum, Porous plates, Slow mode, Solid modeling, Structured materials, Symmetric mode, Theoretical investigations, Ultrasonics, Wave propagation
AbstractThis paper presents a theoretical investigation of ultrasonic wave propagation in a fabricated porous aluminum plate whose microstructure consists of columnar pores oriented normal to the plate surface. Attention is restricted to the symmetric modes which are seen to be compatible with a plane wave source whose wavefronts are vertically incident on the plate. The analysis shows the existence of two fundamental modes, a fast mode and a slow mode, which together transmit energy through the microstructure. The reflectivity and impedance properties of the plate are determined, and it is shown how these vary with frequency, pore spacing, and porosity. By varying the latter during the manufacturing process, a material may be fabricated whose acoustic impedance can be set to any desired value between that of water and solid aluminum. © 2011 IEEE.

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