Title: Shear-induced jamming of granular packings

Author (Invited): Corey OHern, Yale University

Abstract:

Previous experimental studies of photoelastic disks have identified key differences between static granular packings that are generated via compression and shear protocols. For example, these studies found that the interparticle force networks generated via shear possess longer-ranged spatial correlations and larger fabric and stress anisotropies. To what extent do the differences in the structural and mechanical properties between static packings that are generated via compression and shear depend on the interparticle friction and do the differences persist in the large-system limit? In this talk, I will describe a theoretical framework for predicting the protocol-dependent mechanical properties of jammed packings and apply it to computer-generated static packings of frictionless disks obtained via two protocols: (1) isotropic compression and (2) simple shear. I will show that for frictionless systems, all jammed packings can be obtained via either protocol. However, the probability to obtain a particular jammed packing depends on the packing-generation protocol, which leads to protocol-dependent properties.