Fragile granular jamming

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review Letters

OSTI ID:971277

Rivera, Michael K ^[1]; Ecke, Robert E ^[1]; Bandi, Mahesh M ^[2]; Kzakala, Florent ^[3]

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1. Los Alamos National Laboratory
2. HARVARD
3. CNRS & ESPCI PARIS TECH

We demonstrate experimentally that the route to a jammed state for a set of bi-dispersed frictional disks, subjected to uni-axial compression from a random initial unjammed state, consists of a consolidation state, a fragile jammed state, and finally a rigid jammed state. In the consolidation regime, the pressure on the sides increases very slowly with the packing fraction {phi} and there are no detectable stress chains. In the fragile jammed state, stress chains are visible, the pressure increases exponentially with {phi}, and the fraction of moving disks drops exponentially. Eventually, a final regime where particle displacements are below our resolution and the pressure varies approximately linearly with {phi} is reached. We argue that this scenario is generic for ather mal frictional compressed particles.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 971277
• Report Number(s): LA-UR-09-06362; LA-UR-09-6362
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPRESSION
GRANULAR MATERIALS
RESOLUTION