Abstract
We describe a precise phase velocity measurement of longitudinal sound waves in granular solids under stress. We observe an important difference of the phase velocity between the packings of glass beads and sand particles, which is likely due to the interlocking effect caused by the particle shape. This effect can be captured by the contact coordination number using the effective medium theory. We also investigate the change of this coordination number in dry and wet granular packings, caused by cyclic loading or nonlinear sound transmission. These acoustic measurements show that the particle-level properties such as shape and friction significantly influence the response of jammed granular solids to external driving.
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