Grains are macroscopic elastic objects. When two grains press against each other, they repel. This repulsive force is highly nonlinear and is described by the Hertz law (1881). In this talk, I shall focus on how impulses initiated in granular alignments propagate as solitary waves, on how these solitary waves interact with each other, ways in which granular metamaterials can be used to absorb shock waves and to mitigate random noise. I will close with a brief discussion on using sound bursts to find shallow buried objects such as landmines and IEDs.

Research supported by US Army Research Office

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