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Acoustic wave propagation in viscoelastic media with embedded magnetic spheres

Huseyin Aksoy (A Teknoloji)

Mechanics and Dynamics of Periodic Structures

Wed 1:30 - 2:50

Salomon 101

Wave guiding and control of direction of propagation of acoustic waves has been an interest of researchers due to its use in acoustic metamaterial design. Phononic crystals [1,2] and Helmholtz resonators [3] has been used in the design of acoustic cloak and acoustic lenses. In the case of a phononic crystals, lattice parameters and defects are the key parameters which determine the stop and pass bands of acoustic metamaterial or focal length of an acoustic lens [1,2]. Recently soft materials with tunable material properties has been seen as good candidates in obtaining materials with tunable band gaps or directed sound waves. In this study, wave propagation through a thin layer of gelatin gel with embedded magnetic spheres is studied experimentally. Near field pressure distribution is measured by using hydrophone in the frequency range of 50kHz-400kHz. Transmission of sound wave in randomly distributed spheres is compared with periodically distributed spheres. [1] Pennec Y.,Vasseur J. O., Djafari-Rouhani B., Dobrzynski L. and Deymier P. A. 2010, “Two-dimensional phononic crystals: examples and applications,” Surface Science Reports, Vol. 65, pp. 229-291. [2] Yang, S., Page J. H. and Liu, Z. Cowan M. L, Chan, C. T. and Sheng, P. , 2004, “Focusing of sound in a 3D phononic crystals,” Physical Review Letters, Vol. 93, 024301. [3] Zhang S., Yin L. and Fang N. 2009, “Focusing ultrasound with acoustic metamaterial network,” Physical Review Letters, Vol. 102, 194301.