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- W2549314422 abstract "The primary objective of acoustic metamaterial research is to design subwavelength systems that behave as effective materials with novel acoustical properties. Willis coupling is one such property. Initially described by J. R. Willis [Wave Motion 3, pp. 1-11 (1981)], subwavelength structural asymmetry and/or nonlocal effects couple the stress-strain relation to the momentum-velocity relation. This coupling is absent in typical materials. While various theoretical models have predicted the existence of Willis coupling, experimental observation of Willis coupling has not, to our knowledge, been reported in the literature. We present here the first experimental evidence of Willis coupling in a one-dimensional unit cell consisting of a 0.12-mm-thick polyimide membrane under tension, a 5.9-mm-thick layer of air, and a perforated sheet of 0.45-mm-thick paper (perforation surface fraction 0.48, circular holes 3.1 mm in diameter). The properties of the unit cell were extracted using reflection and transmission data measured in a plane-wave impedance tube operating in the long-wavelength limit relative to the unit cell dimensions. The measured material properties, including the Willis coupling coefficient, are in good agreement with the properties predicted using a transmission line model. [Work supported by ONR.]" @default.
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- W2549314422 date "2016-10-01" @default.
- W2549314422 modified "2023-09-26" @default.
- W2549314422 title "Experimental measurement of the Willis coupling coefficient in a one-dimensional system" @default.
- W2549314422 doi "https://doi.org/10.1121/1.4969685" @default.
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