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The mechanical strength and flow of granular materials can depend strongly onthe shapes of individual grains. We report quantitative results obtained fromphotoelasticimetry experiments on locally loaded, quasi-two-dimensionalgranular packings of either disks or pentagons exhibiting stick-slip dynamics.Packings of pentagons resist the intruder at significantly lower packingfractions than packings of disks, transmitting stresses from the intruder tothe boundaries over a smaller spatial extent. Moreover, packings of pentagonsfeature significantly fewer back-bending force chains than packings of disks.Data obtained on the forward spatial extent of stresses and back-bending forcechains collapse when the packing fraction is rescaled according to the packingfraction of steady state open channel formation, though data on intruder forcesand dynamics do not collapse. We comment on the influence of system size onthese findings and highlight connections with the dynamics of the disks andpentagons during slip events.

Stress propagation in locally loaded packings of disks and pentagons