Dilatancy, shear jamming, and a generalized jamming phase diagram of frictionless sphere packings

Babu, V.; Pan, Deng; Jin, Yuliang; Chakraborty, Bulbul; Sastry, Srikanth

doi:10.1039/d0sm02186e

Cited by 22 publications

(40 citation statements)

References 43 publications

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“…The timescale of the most deeply annealed states (i.e., at the largest ϕeq) significantly exceeds previous limitations in simulations, becoming even comparable to experimental scales (35). This breakthrough opens a whole new realm of possibilities for exploring physics in previously inaccessible domains (19,24,25,(34)(35)(36)(37), including IJ (11). In this study, we apply the same methodology to study SJ, showing that such a quantitative advance can conceptually change our understanding: SJ is in fact possible in "frictionless" spheres, if deeply supercooled liquid configurations (more specifically, when ϕeq is above a certain threshold ϕonset) are used as the initial conditions in the jamming protocols.…”

Section: Resultsmentioning

confidence: 88%

“…It was shown in ref. 19 that the same equations of states are shared by the steady states under shear and the isotropically jammed states compressed from ϕJ, and the two jamming densities are very close to each other, ϕc ϕJ.…”

Section: Significancementioning

confidence: 80%

“…It should be noted that deeply annealed glasses are accessible by multiple protocols. Besides the thermal annealing approach used here and previously in (9-11), unjammed configurations above ϕJ can be also obtained by protocols like athermal cyclic overcompression (16) or athermal cyclic shear (17,19). These mechanical training processes can be considered as effective annealing (19) and are reproducible in experiments.…”

Section: Significancementioning

confidence: 80%

“…Besides the thermal annealing approach used here and previously in (9-11), unjammed configurations above ϕJ can be also obtained by protocols like athermal cyclic overcompression (16) or athermal cyclic shear (17,19). These mechanical training processes can be considered as effective annealing (19) and are reproducible in experiments. For example, it is possible to implement AQS using the newly developed multiring Couette shear set-up (18).…”

Section: Significancementioning

confidence: 80%

“…Spheres can be constrained not only by compression but also by shear. Many experiments and simulations have reported shear jamming (SJ) in granular matter and suspensions (12)(13)(14)(15)(16)(17)(18)(19)(20), and it was suggested by several studies that frictional interactions are essential for SJ (21,22). Different from compression jamming, the contact network of a shear-jammed packing is generally anisotropic.…”

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confidence: 99%

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A jamming plane of sphere packings

Jin

Yoshino

2021

Proc. Natl. Acad. Sci. U.S.A.

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The concept of jamming has attracted great research interest due to its broad relevance in soft-matter, such as liquids, glasses, colloids, foams, and granular materials, and its deep connection to sphere packing and optimization problems. Here, we show that the domain of amorphous jammed states of frictionless spheres can be significantly extended, from the well-known jamming-point at a fixed density, to a jamming-plane that spans the density and shear strain axes. We explore the jamming-plane, via athermal and thermal simulations of compression and shear jamming, with initial equilibrium configurations prepared by an efficient swap algorithm. The jamming-plane can be divided into reversible-jamming and irreversible-jamming regimes, based on the reversibility of the route from the initial configuration to jamming. Our results suggest that the irreversible-jamming behavior reflects an escape from the metastable glass basin to which the initial configuration belongs to or the absence of such basins. All jammed states, either compression- or shear-jammed, are isostatic and exhibit jamming criticality of the same universality class. However, the anisotropy of contact networks nontrivially depends on the jamming density and strain. Among all state points on the jamming-plane, the jamming-point is a unique one with the minimum jamming density and the maximum randomness. For crystalline packings, the jamming-plane shrinks into a single shear jamming-line that is independent of initial configurations. Our study paves the way for solving the long-standing random close-packing problem and provides a more complete framework to understand jamming.

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