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Ensemble Force Spectroscopy by Shear Forces
Published on: July 26, 2022
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Force networks and jamming in shear-deformed sphere packings
H A Vinutha1,2, Srikanth Sastry1
1Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur Campus, Bengaluru 560064, India.
Physical Review. E
|February 21, 2019
Summary
Shear jamming in granular matter becomes rigid at a critical contact number, D+1, regardless of friction. This jamming phenomenon aligns with frictionless systems, unifying descriptions of disordered matter rigidity.
Area of Science:
- Soft matter physics
- Granular mechanics
- Disordered systems
Background:
- Rigidity emergence in disordered particle assemblies is key in soft matter (gels, foams, granular matter).
- Shear jamming in frictional grains is a unique case where shear stress induces rigidity.
- Existing models for shear jamming lack integration with frictionless systems.
Purpose of the Study:
- To computationally analyze shear jamming conditions in frictionless sphere assemblies.
- To investigate the relationship between structural features and jamming in the absence of friction.
- To unify the understanding of jamming phenomena across diverse disordered matter.
Main Methods:
- Computational analysis of force and torque balance in sheared sphere assemblies.
- Validation using frictional simulations.
- Rigidity percolation analysis for 2D systems.
Main Results:
- Shear jamming occurs at a mean contact number Z = D+1 (for D=2,3), irrespective of friction, above random loose packing density.
- The shear jamming threshold aligns with the marginal stability condition for frictionless jamming.
- Rigidity percolation precedes shear jamming and coincides with over-constrained region percolation in 2D.
Conclusions:
- A geometric description of shear jamming is provided, linking it to frictionless jamming and glass transition concepts.
- This work helps develop a unified framework for jamming phenomenology in disordered matter.
- Identified an intermediate phase in shear jamming analogous to that in covalent glasses.
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