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We investigate the unjamming response of disordered packings of frictionalhard disks with the help of computer simulations. First, we generate jammedconfigurations of the disks and then force them to move again by localperturbations. We study the spatial distribution of the stress and displacementresponse and find long range effects of the perturbation in both cases. Werecord the penetration depth of the displacements and the critical force thatis needed to make the system yield. These quantities are tested in two types ofsystems: in ideal homogeneous packings in zero gravity and in packings settledunder gravity. The penetration depth and the critical force are sensitive tothe interparticle friction coefficient. Qualitatively, the same nonmonotonicfriction dependence is found both with and without gravity, however thelocation of the extrema are at different friction values. We discuss the roleof the connectivity of the contact network and of the pressure gradient in theunjamming response.

Unjamming due to local perturbations in granular packings with and without gravity