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Published March 16, 2016 | Submitted
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Locally Resonant Granular Chain


We report the design and testing of a tunable and nonlinear mechanical metamaterial, called locally resonant granular chain. It consists of a one-dimensional array of hollow spherical particles in contact, containing local resonators. The resonant particles are made of an aluminium outer spherical shell and a steel inner mass connected by a polymeric plastic structure acting as a spring. We characterize the linear spectra of the individual particles and of one-dimensional arrays of particles using theory, numerical analysis, and experiments. A wide band gap is observed as well as tunability of the dispersive spectrum by changing the applied static load. Finally, we experimentally explore the nonlinear dynamics of the resonant particles. By using nonlinear acoustical techniques, we reveal a complex, nonclassical nonlinear dynamics.

Additional Information

L.B. and C.D. acknowledge support from the US NSF, grant number 0969541 and the US Office of Naval Research, YIP program. G.T. acknowledges support from CIG FP7 ComGranSol. We thank Marc Serra Garcia for his support in experiments. We acknowledge V. Tournat and D. Ngo for helpful discussions.

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