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Directional Wave Propagation in a Highly Nonlinear Square Packing of Spheres

Leonard, A. and Fraternali, F. and Daraio, C. (2013) Directional Wave Propagation in a Highly Nonlinear Square Packing of Spheres. Experimental Mechanics, 53 (3). pp. 327-337. ISSN 0014-4851. doi:10.1007/s11340-011-9544-6.

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We studied the dynamic response of a two-dimensional square packing of uncompressed stainless steel spheres excited by impulsive loadings. We developed a new experimental measurement technique, employing miniature tri-axial accelerometers, to determine the stress wave properties in the array resulting from both an in-plane and out-of-plane impact. Results from our numerical simulations, based on a discrete particle model, were in good agreement with the experimental results. We observed that the impulsive excitations were resolved into solitary waves traveling only through initially excited chains. The observed solitary waves were determined to have similar (Hertzian) properties to the extensively studied solitary waves supported by an uncompressed, uniform, one-dimensional chain of spheres. The highly directional response of this system could be used as a basis to design granular crystals with predetermined wave propagation paths capable of mitigating stress wave energy.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Fraternali, F.0000-0002-7549-6405
Daraio, C.0000-0001-5296-4440
Additional Information:© 2011 Society for Experimental Mechanics. Received: 16 July 2011; Accepted: 29 August 2011; Published online: 6 October 2011. We thank Dr. A. Spadoni for his suggestions in the design of the confining box used in experiments. We also thank R. Giordano and A. Esposito for their preliminary work on the subject. This work was supported by an award from the Department of Energy Office of Science (DOE SCGF) and the Army Research Office MURI (Dr. David Stepp).
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Army Research Office (ARO)UNSPECIFIED
Subject Keywords:Two-dimensional square packing; Granular crystals; Highly nonlinear dynamics; Directional wave propagation; Impulsive excitation
Issue or Number:3
Record Number:CaltechAUTHORS:20130321-154604673
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Official Citation:Leonard, A., Fraternali, F. & Daraio, C. Exp Mech (2013) 53: 327. doi:10.1007/s11340-011-9544-6
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37598
Deposited By: Tony Diaz
Deposited On:25 Mar 2013 21:35
Last Modified:09 Nov 2021 23:30

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