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Experimental and Numerical Study of Wave Propagation in Granular Media

On, T. and Smith, K. J. and Geubelle, P. H. and Lambros, J. and Spadoni, A. and Daraio, C. (2011) Experimental and Numerical Study of Wave Propagation in Granular Media. In: Dynamic Behavior of Materials. Conference Proceedings of the Society for Experimental Mechanics Series. Vol.1. No.99. Springer , New York, NY, pp. 95-98. ISBN 978-1-4614-0215-2.

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One dimensional stress waves travelling in granular chains exhibit interesting characteristics such as filtering, tunability and wave mitigation because on the formation of solitary waves, and solitary wave trains, within them. An idealized one dimensional granular medium, consisting of a linear array of contacting spherical brass beads, was loaded dynamically in a modified split Hopkinson pressure bar, with loading pulses that span a variety of rates and profiles using pulse shaping techniques. Different chain lengths were studied to determine how solitary waves form in a varying length granular medium, as well as the speed of wave propagation. It is found that the wave speed propagates faster for longer chains of brass beads. The high loading rates of the Hopkinson bar also allowed us to investigate plastic dissipation effects in the granular chain when composed of different types of metals. To further our understanding of wave propagation in ductile ordered granular media, the experimental results are compared with companion numerical simulations based on a particle contact law that accounts for plastic dissipation. Knowing the behavior of a stress wave propagating through such materials can lead to arrangements that can produce desired stress wave mitigation characteristics as the waves travel through the granular chain.

Item Type:Book Section
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Daraio, C.0000-0001-5296-4440
Additional Information:© 2011 The Society for Experimental Mechanics, Inc.
Series Name:Conference Proceedings of the Society for Experimental Mechanics Series
Issue or Number:99
Record Number:CaltechAUTHORS:20161004-155606386
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70845
Deposited By: Tony Diaz
Deposited On:04 Oct 2016 23:18
Last Modified:05 May 2020 18:05

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