Amplitude-dependent attenuation of compressive waves in curved granular crystals constrained by elastic guides |
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Authors: | Jinkyu?Yang Sachith?Dunatunga Email author" target="_blank">Chiara?DaraioEmail author |
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Affiliation: | (1) Department of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA;(2) Department of Civil Engineering, University of Salerno, 84084 Fisciano, SA, Italy |
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Abstract: | We study the wave propagation in a curved chain of spherical particles constrained by elastic guides under the axial impact
of a falling mass. We characterize the force transmission properties of the chain by varying the striker’s mass and the chain’s
curvature. Experimental tests demonstrate amplitude-dependent attenuation of compressive waves propagating through the curved
chain. In particular, we observe that the curved systems present an improved transmission of small dynamic disturbances relative
to that of strong excitations, resulting from the close interplay between the granular particles and the softer elastic medium.
We also find that the transmission of the compressive waves through the chains is dependent on the initial curvature imposed
to the system. Numerical simulations, based on an approach that combines discrete element and finite element methods, corroborate
the experimental results. The findings suggest that hybrid structures composed of granular particles and linear elastic media
can be employed as new passive acoustic filtering materials that selectively transmit or mitigate excitations in a desired
range of pressure amplitudes. |
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