Daniels Nonlinear Lab

Sound and Force Propagation

Sound propagation in granular materials has many unexplained features related to its speed of propagation, damping, and dispersion. We have developed a way to simultaneously image sound propagation and record acoustic signals on the single-particle scale to study the effects of the force chain networks on the sound.

In the animation to the left, the lower left frame shows the static force chain structure initially present in the pack. A square pulse begins at the driver (yellow) and propagates to the left to accelerometers (red and blue). The graph to the right shows the driver pulse (black) and the corresponding accelerometer responses. The upper left image shows a frame-differenced movie of the stress wave as it moves through the pack.

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