Jamming in Perspective
2018
Jammingoccurs when objects like grains are packed tightly together (e.g. grain
silos). It is highly cooperative and can lead to phenomena like earthquakes, traffic
jamsetc. In this Letter we point out the paramount importance of the underlying contact network for
jammedsystems; it must have both isostatic plus one contacts {\it{and}} a finite
bulk modulus. Isostatic means that the number of degrees of freedom are exactly balanced by the number of constraints. This defines a large class of networks that can be constructed without the necessity of packing particles together (either in the lab or computationally). One such construction, which we explore here, involves setting up the
Delaunay triangulationof a Poisson disk sampling, and then removing edges to maximize the
bulk modulus, until the isostatic plus one point is reached. This construction works in any dimensions and here we give results in 2d where we also show how such networks can be transformed into a
jammed
disk pack.
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