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Dense granular systems subjected to an imposed shear stress undergostick-slip dynamics with systematic patterns of dilation-compaction. Duringeach stick phase, as the frictional strength builds up, the granular systemdilates to accommodate shear strain, developing stronger force networks. Duringeach slip event, when the stored energy is released, particles experience largerearrangements and the granular network can significantly change. Here, we usenumerical simulations of 3D, sheared frictional packings to show that the meanbetweenness centrality -- a property of network of interparticle connections --follows consistent patterns during the stick-slip dynamics, showing sharpspikes at each slip event. We identify the source of this behavior as arisingfrom the connectivity and contact arrangements of granular network duringdilation-compaction cycles, and find that a lower potential for connectionbetween particles leads to an increase of mean betweenness centrality in thesystem. Furthermore, we show that at high confinements, few particles losecontact during slip events, leading to a smaller change in granularconnectivity and betweenness centrality.

Betweenness centrality illuminates intermittent frictional dynamics