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8 April 2009 Controlling acoustic-wave propagation through material anisotropy
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Acoustic-wave velocity is strongly direction dependent in an anisotropic medium. This can be used to design composites with preferred acoustic-energy transport characteristics. In a unidirectional fiber-glass composite, for example, the preferred direction corresponds to the fiber orientation which is associated with the highest stiffness and which can be used to guide the momentum and energy of the acoustic waves either away from or toward a region within the material, depending on whether one wishes to avoid or harvest the corresponding stress waves. The main focus of this work is to illustrate this phenomenon using numerical simulations and then check the results experimentally.
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Aref Tehranian, Alireza V. Amirkhizi, Jeffrey Irion, Jon Isaacs, and Sia Nemat-Nasser "Controlling acoustic-wave propagation through material anisotropy", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72950V (8 April 2009);

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